SEMINAR ON AFFORDABLE RAPID MASS HOUSING USING GFRG PANELS SEMINAR REPORT Submitted by:
SUMAN PATI (Roll No.: 100301CER012) GUIDED BY:
Prashant Kumar Nayak
CENTURION INSTITUTE OF TECHNOLOGY, JATNI in partial fulfillment for the award of the degree of
BACHELOR OF TECHNOLOGY in
CIVIL ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
CERTIFICATE This is to certify that the Seminar titled
Affordable Rapid Mass Housing Using GFRG Panels Was prepared and presented by
SUMAN PATI (Roll No.: 100301CER012) of the eighth Semester Civil Engineering in partial fulfillment of requirement for the award of Degree of Bachelor of Technology in Civil Engineering under the Centurion University of Technology& Management during the year 2013
SEMINAR GUIDE
SEMINAR IN-CHARGE
Prashant Kumar Nayak
Prof. Siba Prashad Mishra Prof. Jayakrushna Dash
DECLARATION
“I hereby declare that this submission is my own work and that to the rest of my knowledge and belief, it contains no material previously published or written by another person nor the material which has been accepted for the award of any other degree of the university or other institute of higher learning, except where due acknowledgement has been made in the text”.
Place: Jatni, Khurda
Name : Suman Pati
Date: 31- 12- 2013
Regd No. : 100301CER12
ACKNOWLEDGEMENT I have the greatest pleasure to offer my profound respect and pleasure and sincere thanks to Prashant Kumar Nayak for his support in achieving the objective of my Seminar work. I express my deep sense of gratitude to Prashant Kumar Nayak (Seminar Mentor) who became the source of inspiration for me in completion of the seminar work. I foremost like to express my sincere gratitude to Prof. Jayakrushna Dash and Prof. Siba Prashad Mishra (Seminar In-Charge) for the continuous support on my Study and for their patience, motivation, enthusiasm and immerse knowledge. Their guidance helped me a lot for my technical seminar. I could not have imagined having a better advisor and mentor for my B.Tech. Study. My special thanks to my parents and my friends, who have been supportive and caring throughout my every step.
Signature of student Suman Pati
ABSTRACT There is a huge growing requirement of building materials in India due to the existing housing shortage of 24.7 million units ( 2007) mainly for the low income groups in urban India. Estimated urban housing shortage in 2012 is 26.53 million, while the housing shortage of rural India in 2012 is 42 million units. Thus total estimated housing shortage for Urban & rural India in 2012 is 68.53 million units. To meet this challenge, India requires innovative, energy efficient building materials for strong and durable housing in fast track method of construction at affordable cost. It is also important that housing and buildings are disaster resistant to protect the lives and properties of people. All these concerns are involved in sustainable and inclusive development. Rapidwall Panel provides rapid or faster construction and contributes to environmental protection, providing a solution to many of the above issues and concerns. The paper describes the method of construction using Rapidwall panels based on construction manual prepared by IIT Madras to suit Indian situation. FACT & RCF, two fertiliser giants under public sector are together setting up Rapidwall and plaster products manufacturing plant at Ambalamugal using Rapidwall technologies of Australia called FACT RCF Building products Ltd. (FRBL). FACT has about 7 million tons of industrial by product gypsum. By setting up Rapidwall & Plaster products plant, they intend to produce 1.4 million sqm or 15 million sq ft panel per year and about 50000 tons of superior quality wall plaster and wall putty.
CONTENT
Items
Page No.
Certificate DECLARATION ACKNOWLEDGEMENT ABSTRACT
i ii iii iv Chapter 1
Introduction
1
Chapter 2 MANUFACTURING OF GFRG PANEL 2.1 Inspections & Testing Chapter 3 PHYSICAL AND MATERIAL PROPERTIES
2 2 3
Chapter 4 JOINTS
4 Chapter 5
TRANSPORTATION AND LIFTING
6 Chapter 6
CONSTRUCTION & WORKMANSHIP 6.1 FOUNDATION 6.2 RAPID WALL 6.3 OPENINGS 6.4 LINTEL 6.5 CONCRETE INFILL 6.6 TIE BEAM 6.7 ROOF SLAB 6.8 Erection of wall panel and floor slab for upper floor 6.9 Water proofing 6.10 STAIR CASE 6.11 FINISHING WORK Chapter 7 COMPERISON
7 7 7 7 8 8 8 8 9 9 9 9 10
Chapter 8 VARIOUS TEST 8.1 Measurement of Water Content 8.2 Measurement of Density 8.3 Measurement of Water Absorption Rate 8.4 Flexural Bending Test 8.5 Durability Test
11 11 11 12 12 14
Chapter 9 RAPAIDWALL FOR AFFORDABLE QUALITY HOUSING 15 9.1 USES of RAPIDWALL 16 9.2 RCC Columns, beams with Rapidwall floor and walls in high rise building 16 9.3 Scattered small and row houses 16
9.4 FACT & RCF tie up
17
Conclusion
18
Bibliography
19
CHAPTER 1
INTRODUCTION The threat of climate change caused by the increasing concentration of greenhouse gases in the atmosphere is pushing the whole world into a catastrophic crisis situation with universal concern. The need of the 21st century is for energy efficient and ecofriendly products. The building industry accounts for 40% of CO2 emissions. Building construction causes CO2 emissions as a result of embodied energy consumed in the production of energy intensive building materials and also the recurring energy consumption for cooling and heating of indoor environment. Rapidwall, also called gypcrete panel is an energy efficient green building material with huge potential for use as load bearing and non load bearing wall panels. Rapidwall is a large load bearing panel with modular cavities suitable for both external and internal walls. It can also be used as intermediary floor slab/roof slab in combination with RCC as a composite material. Since the advent of innovative Rapidwall panel in 1990 in Australia, it has been used for buildings ranging from single storey to medium - high rise buildings. Light weighted Rapidwall has high compressive strength, shearing strength, flexural strength and ductility. It has very high level of resistance to fire, heat, water, termites, rot and corrosion. Concrete infill with vertical reinforcement rods enhances its vertical and lateral load capabilities. Rapidwall buildings are resistant to earthquakes, cyclones and fire.
Fig.1 Worlds’ largest load bearing lightweight panel
CHAPTER 2
MANUFACTURING OF GFRG PANEL
Phosphogypsum which is a byproduct of phosphoric acid plant is calcined in calciner at 140-1500 C at the rate of 15MT/hr of calcined plaster. This calcined plaster is stored in product silo having capacity of 250MT. The plaster is then transferred to batch hopper by screw conveyors and through Entoleter in wall panel manufacturing area. This area consists of 6 casting tables having dimensions of 3m x12m, one crab having mixer and glass roving delivery system is for delivering slurry and glass roving for three tables. The chemicals are added in water & mixed and then plaster is added & mixed to form slurry. One layer of slurry is laid on the table by the crab followed by a layer of glass roving. This glass roving is embedded in to the slurry with the help of screen roller. Another layer of slurry is poured followed by a layer of glass roving this layer is pushed inside the ribs with the help of temping bar. Finally a layer of glass roving is laid for the top face of the wall panel. After getting final Gilmore wall panel is lifted from the casting table to ACROBA frame and shifted to dryer for drying. The wall panel is dried at a temperature of 275˚C for 60 minutes. After drying, the wall panel is either shifted to storage area or on the cutting table. The wall panel is cut as per dimensions supplied by the consumer and the cut pieces are transferred to stillages which are specially made for transporting wall panel. The liquid effluent generated during manufacturing process is recycled back in the system for manufacturing of new wall panels. The solid waste which is generated while manufacturing wall panels is recycled back to the calciner after crushing and separating plaster & glass roving in recycle plant. The above system is a batch process. Six wall panels can be manufactured in eight hour shift per table. Similarly, 36 wall panels can be manufactured in eight hour shift with 6 tables. Flow diagram of the system showing the manufacturing process is attached herewith. 2.1 Inspections & Testing: It shall be done at appropriate stages of manufacturing process. The inspected panels shall be stored & packed to ensure that no damage occurs during transportation. As part of quality assurance regular in process inspections shall be carried out by the trained personnel of the PAC holder.
CHAPTER 3
PHYSICAL AND MATERIAL PROPERTIES
Rapidwall panel is world‟s largest load-bearing lightweight panels. The panels are manufactured with size 12 m length, 3m height and 124 mm thickness. Each panel has 48 modular cavities of 230 mm x 94 mm x 3m dimension. The weight of one panel is 1440 kg or 40 kg/sqm. The density of the panel is 1.14g/cm3, being only 10-12 % of the weight of comparable concrete /brick masonry. The physical and material properties of panels are as follows: Weight Axial load capacity
44 Kg/ sqm 160 kN/m{ 16 tons/ m}
Compressive strength
73.2 Kg/cm2
Flexural strength
21.25 kg/cm2
Tensile Strength
35 KN/ m
Fire resistance
4 hr rating withstood 700-10000 C
Elastic Modulus
3000-6000Mpa
Water absorption
< 5%
The vertical and lateral load capability of Rapidwall Panel can be increased many fold by infill of concrete after placing reinforcement rods vertically. As per structural requirement, cavities of wall panel can be filled in various combinations (See Fig.2.)
CHAPTER 4
JOINTS
Wall to wall „L‟, „T‟, „+‟ angle joints and horizontal wall joints are made by cutting of inner or outer flanges or web appropriately and infill of concrete with vertical reinforcement with stirrups for anchorage. Various construction joints are illustrated in Fig.3.
Fig.2 : RCC infill to increase load capability
Fig.3 Various construction joints
Rapidwall Panel can also be used for intermediary floor slab / roof slab in combination with embedded RCC micro-beams and RCC screed concrete (Fig.4).
Fig.4 GFRG embedded with RCC micro beams and RCC screed concrete
CHAPTER 5
TRANSPORTATION AND LIFTING Panels are vertically loaded at the factory on stillages for transport to the construction sites on trucks. Each stillage holds 5 or 8 pre-cut panels. The stillages are placed at the construction site close to the foundation for erection using vehicle mounted crane or other type of crane with required boom length for construction of low, medium and high rise buildings. Special lifting jaws suitable to lift the pane l are used by inserting into the cavities and pierced into webs, so that lifting/handling of panels will be safe.
Fig.5 Transportation and lifting of the GFRG panel
CHAPTER 6
CONSTRUCTION & WORKMANSHIP 6.1 FOUNDATION: For Rapidwall Housing a conventional foundation like spread footing, RCC column footing, raft or pile foundation is used as per the soil condition and load factors. All around the building RCC plinth beam is provided. Conventional water proofing materials are used in the foundation.
Fig.6 Foundation part of the construction
6.2 RAPID WALL: Rapidwall enables fast track method of construction. Conventional building construction involves various time consuming processes, like i) masonry wall construction ii) cement plastering requiring curing, iii) casting of RCC slabs requiring centering and scaffolding and curing iv) removal of centering and scaffolding and v) plastering of ceilings and so on. Construction time is minimized to 15-20% by the rapid wall method. Instead of brick by brick construction, Rapidwall enables wall by wall construction. Rapidwall also does not require cement plastering as both surfaces are smooth and even and ready for application of special primer and finishing coat of paint. 6.3 OPENINGS:Door/window, openings will be cut and reinforced concrete is provided there.
Fig. 7 Window opening
6.4 LINTEL:
Embedded RCC lintels are to be provided wherever required by cutting open external flange. Reinforcement for lintels and RCC sunshades can be provided with required shuttering and support. 6.5 CONCRETE INFILL: After inserting vertical reinforcement rods as per the structural design and clamps for wall corners are in place to keep the wall panels in perfect position, concrete of 12mm size aggregate will be poured from top into the cavities. There is no need to use vibrator because gravitational pressure acts to self compact the concrete inside the water tight cavities. Generally every third cavity should be concreted. 6.6 TIE BEAM: An embedded RCC tie beam to floor/roof slab is to be provided at each floor/roof slab level, as an essential requirement of national building code against earth quakes. For this, web portion to required beam depth at top is to be cut and removed for placing horizontal reinforcement with stirrups and concreted. 6.7 ROOF SLAB: Instead of a solid concrete floor slab, which is typically 100 to 150mm thick, the GFRG panels are used. They are placed horizontally over the walls in different roofs. The roofs typically spanning along the shorter direction. Concrete tie beams connect the panels to the walls at all junctions. Every third cavity in the horizontal GFRG panel is cut open from the top and reinforced cage is inserted to serve as a concealed beam. Further a steel welded mesh is placed on top of the entire floor slab and subsequently embedded in screed of concrete 50mm thick. The advantage with the system over conventional concrete slabs is the there is no need of shuttering and the finish at bottom is excellent. It also not required any plastering. Conduits for electrical work are kept in place before concreting the slab.
Fig.8 Roof slab construction
6.8 Erection of wall panel and floor slab for upper floor:
Vertical reinforcement of floor below shall be provided with extra length so as to protrude to 0.45m to serve as start up rods and lap length for upper floor. Once the wall panels are erected on the upper floor, vertical reinforcement rods, door/window frames fixed and RCC lintels shall be casted. Then concrete where required and joints shall be filled. Thereafter, RCC tie beams all around shall be concreted. 6.9 Water proofing: The PAC holder shall provide to the client details of water proofing treatment required at different levels of construction such as foundation, sunshade and flooring etc. 6.8 STAIR CASE: The stair case work is taken up using GFRG panels as the landing slab with reinforced concrete bars in all the cavities.
Fig.9 Stair case construction
6.9 FINISHING WORK: Once concreting of ground floor roof slab is completed, on the 4 th day, wooden planks with support props in ground floor can be removed. Finishing of internal wall corners and ceiling corners etc can be done using wall putty or special plaster by experienced plasterers. Simultaneously, electrical work, water supply and sanitary work, floor tiling, mosaic or marble works, staircase work etc can also be carried out. Every upper floor can be finished in the same way.
Fig.10Finishing Work
CHAPTER 7
COMPERISON Comparative study of Rapidwall building and conventional 2storey 1500 sft Building: Materials/ items Rapidwall Building Conventional Building Saving in % Cement
16 tons
32.55 tons
50.8
Steel
1800 kg
2779 kg
35.2
Sand
20cum
83.37cum
76
Granite
38cum
52.46cum
27.56
Bricks
-
57200
GFRG panel
500sqm
Water
50000ltr
200000ltr
75
Labour
389 mandays
1200 mandays
67.59
Construction time
21 days
120 days
82
Wt. of superstructure
170 tons
490 tons
65
Construction cost
Rs 13.25 lakhs
Rs 18.27 lakhs
61.5
CHAPTER 8 VARIOUS TEST
-
8.1 Measurement of Water Content: The water content shall be tested for the selected panels against Clause 7.3. Sampling of the test specimen shall be made in accordance with Clause 10.2.1. Do not treat the edges and surfaces of the specimens nor damage the specimens. This test measures the loss of water of the specimen after drying in a standard oven. It is combined with the measurement of density and water absorption tests. Should the samples after conditioning take up moisture then the panel was over cooked (calcined) in the dryer and fails the test. 8.1.1 Apparatus: Air circulating oven: The net space available inside the drying oven shall not be less than 200×300×360. The oven shall have a temperature control at 40±2°C and a humidity control at 50±2%. Balance or scale: with a capacity of 5kg and an accuracy of 0.5g. 8.1.2 Test Procedure: 1). Weigh each original specimen and record their weights; 2). Condition the specimen (or specimens) to constant weights, within 0.1% of the dried weight, at a temperature of 40±2°C, in an atmosphere having a relative humidity of 50±2%. This can be done by drying the specimen for 24 hours initially and weighing the specimen; then drying for another 4 hours each time and weighing the specimen until the difference of the two consecutive weights of the specimen is with 0.1% of the dried weight; and 3). Weigh the dried weight w of each specimen to within 0.5g. 8.1.3 Calculation of Results: The weight loss of the individual specimen in percent with respect to its dried weight w is the water content of the specimen. 8.2 Measurement of Density: Density of the panel shall be measured from the specimens immediately after the water content tests and before water absorption tests. Care shall be taken to prevent damaging the specimens in the measurement so that it does not affect the water absorption test. 8.2.1 Apparatus: Right-angle ruler: with an accuracy of within 1 mm. 8.2.2 Test procedure: Take the following measurements from each specimen:-
The four dimensions as shown in Fig.7 measured to within 1mm, where H1 and H2 are the lengths of the two vertical sides, respectively, and B1 and B2 are the horizontal dimensions that are perpendicular to the vertical side measured with a ight-ngle ruler. 8.3 Measurement of Density: Density of the panel shall be measured from the specimens immediately after the water content tests and before water absorption tests. Care shall be taken to prevent damaging the specimens in the measurement so that it does not affect the water absorption test. 8.3.1 Apparatus: Right-angle ruler: with an accuracy of within 1 mm. 8.3.2 Test procedure: Take the following measurements from each specimen:The four dimensions as shown in Fig.7 measured to within 1mm, where H1 and H2 are the lengths of the two vertical sides, respectively, and B1 and B2 are the horizontal dimensions that is perpendicular to the vertical side measured with a right-angle ruler. 8.4 Measurement of Water Absorption Rate: The specimens tested for density is immediately used for water absorption rate. 8.4.1Apparatus: Balance: same as 10.4.3.1. Water bath or container: enough room to immerse the three specimens and keep them separated and elevated from the bottom of the bath with minimum spaces of 25mm. 8.4.2 Test procedure: 1). Immerse the specimens flat in a bath of water at a constant temperature of 21±0.5°C with a head of 25 mm of water over the top of the sample. The sample should be positioned in the water bath elevated one inch above its base; 2). Remove the specimens from the bath after 24 hours of immersion, wipe excess water from the surfaces and edges of the specimens and weigh immediately to within 0.5g. 8.4.3 Calculation of results: The percentage of weight gain with respect to the dried weight of each specimen calculated is the water absorption rate. 8.5 Flexural Bending Test:
(a)Pin Support
(b) Roller support
8.5.1 Apparatus: As the specimen is one meter wide, it is important for the load and reaction force from the supports to be distributed evenly along the width of the specimen. The point load from a load jack is applied to a main distribution beam that then distributes the load equally to two secondary distribution beams. The load is finally transmitted from the secondary distribution beams to the top face of the test specimen as an evenly distributed line load. The minimum ultimate flexural strength of the main distribution beam shall be 10kNm. The secondary distribution beam shall be 1000mm long with a minimum flexural rigidity EI of 5×1011 N/mm2. To ensure a good contact and even distribution of load, a thin layer of quick-setting plaster (such as dental paste) shall be applied between the bottom face of the secondary beams and the contact surface of the specimen. The specimen shall be supported firmly with one pin support and one roller support as illustrated in Fig.11. The pin support is composed of two steel plates of 1000mm long×100mm wide × minimum10mm thick and a 1m long steel roller bar with a minimum diameter of 30mm. The steel bar is fixed to the bottom plate (such as by welding) and the top plate just sit on top of the bar to ensure free rotation. The roller support shown in Fig.11(b) is similar to the pin support except that some smaller steel roller bars of about 10mm diameter and 1000mm long are provided underneath the bottom steel plate to ensure both free rotation and longitudinal movement. The loading jack shall have a minimum load capacity of 20kN. The displacement transducer shall have a minimum travel distance of 100mm. The measurement or data acquisition involves both the applied load measured from the load cell and displacement from the displacement transducer at the mid-span. The accuracy of measurements shall be within 0.1kN for load and 0.5mm for displacement. 8.5.2 Test procedure: 1) Mark the positions of support line (centre line position of the roller bar) on the
bottom of the specimen, and load line (centre line position of the secondary distribution beam) on the top of the test specimen; 2) Set up the pin and roller supports; 3) Apply a thin layer of quick-setting plaster on top of the supporting steel plates and then place the test specimen on top of the two supports. Waite a few minutes for the plaster to set; 4) Apply a layer quick-setting plaster on top of the test specimen at the position of the secondary distribution beams and place the secondary distribution beams in position. Allow the plaster to set; 5) Set up the rest of the loading system (main distribution beam and its support, etc.) and loading jack; 6) Place the displacement transducer under the test specimen at the mid-span. A piece of small plate (about 20mm×20mm×2mmthick) shall be glued onto the tip of the transducer to prevent it from going into a crack if the crack happens to occur at the position of the displacement measurement point; 7) Load the jack under displacement control in a strain rate of not greater than 5mm/minute until the load passes the peak and drops at least 50% off its peak load; 8) In the mean time of applying loading, record the test data at sufficient number of test points to produce a load vs. displacement curve (as illustrated in Fig.12). An automatic data acquisition system is recommended that can record the complete test curve automatically. If manual record is used, one data point (a pair of load and displacement readings) shall be taken at a displacement increment of not more than 1.5mm. 8.6 Durability Test: 8.6.1 Wetting and drying test:
Put the panels through 20 cycles of wetting and drying at room temperature of 300C. Each cycle consist of 24 hours of wetting followed by 24 hours of drying. Measure the average compressive strength at the end of 20 cycles. 8.6.2 Salt spray test:
Embed a 12mm dia,250mm reinforcing rod in the concrete filled in cavity. After 7 days curing, hung the same in a salt spray chamber for 2 weeks. Observe any apparent damage to the panel and to the reinforcement. 8.6.3 Fire Resistance test:
The fire resistance test on GFRG panel (Rapidwall) shall be conducted using a blow torch (burning kerosene as fuel). The blue flame temperature shall be measured and shall be in the range of 7000 C to 10000C. The blower tip of the blow torch shall be kept at a distance of about 50 mm from one face of the building panel (size 300 x 300 x 124mm) so that the blue flame shall directly hit the panel continuously. The panel shall
be exposed to such a state for continuation duration of 4 hours. The other face of the panel shall be pasted with a thermocouple to monitor the temperature continuously. Record the temperatures (0C) at 30 minutes interval during the test period of 4 hours for the hollow GFRG panel and the GFRG panel filled with M20 concrete the results. At the end of the test, no damage or cracks should be observed beyond the spot where the flame was directly hitting the face of the panel.
CHAPTER 9
RAPAIDWALL FOR AFFORDABLE QUALITY HOUSING Access to adequate shelter at affordable cost by low income section and common people is very important for India for inclusive development.. The booming of real estate and construction industry has indeed shot up the cost of construction due to the ever increasing cost of cement, steel, bricks, river sand, concrete materials and labour cost. In this situation, safe and good quality housing will become unaffordable to all the sections. Commonly used walling in India is brick masonry. Cost of brick wall with two sides cement plastering has increased by almost 4 times during the last 5 years. Brick wall construction cost was Rs 460/sqm in 2003. This increased to Rs 1700 /sqm in 2007. In view of likely increase in cost of energy, bricks, cement, river sand, water, labour and hire charges for scaffolding etc, the cost of masonry made of bricks or concrete blocks will continue to rise in future. This will make Rapidwall panel much
cheaper and affordable to the building industry while it will also help to protect the environment, as one sqm panel will save carbon emission reduction of about 80Kg. Rapidwall panel has excellent acoustic properties. Testing of panel by IIT Madras found that the panel belongs to a class of STC 40 with respect to air-borne sound insulation. Infill of cavities with locally available cheaper materials like quarry dust mixed with cement (1:20) and water or sand and cement (1:20) up to lintel/ window height can make the wall solid and address security-related concerns. Other than Australia and China, India is set to benefit from the technology as Rapidwall panels are to be manufactured and marketed in Mumbai within few months by RCF, one of the largest fertilizer company of Govt. of India. FACT, another large public undertaking fertilizer company in joint venture with RCF is also setting up another rapidwall plant in Cochin. A Rapidwall plant near Chennai is also commissioning and marketing the product shortly. In Rapidwall construction, especially in repetitive type mass housing, time for construction will be reduced by 75-80% thereby reducing overall overhead establishment costs with reduced lock up investment period and less labour component. Comparative study of Rapidwall building and conventional building (2 storey 1500 sft) shows significant savings in Rapidwall buildings. Embodied energy of Rapidwall building is only 82921 kWh, while conventional same size building would have 215400 kWh, thereby saving 61.5% embodied energy.
9.1 USES of RAPIDWALL: The most valuable use of Rapidwall is its use as load bearing wall in multi storey construction in combination with RCC. Rapidwall can also be used as non load bearing and partition wall in RCC framed structures. IIT Madras has recently developed method of fixing panel in between RCC columns, beams and floor slab with clamping system. By this panel can be fixed to floor slab and panel at bottom using screws, which will be embedded within flooring and skirting. At top clamps will be fixed to panel and ceiling slab or beam. On sides also clamped at bottom to RCC column, floor slab and panel. Plastering of walls can also be saved thereby saving time and cost. If this is taken into account at design stage itself, dead load reduction of more than 50% can be made. This will save in foundation, RCC columns and beams, in turn steel and concrete. This will make substantial savings in cost of construction. 9.2 RCC Columns, beams with Rapidwall floor and walls in high rise building: One of the leading architects based in Mumbai proposed an innovative method of construction of high rise building with RCC columns and beams to take load, while panel is to be used for walls and floor slab with micro beams. For this specially designed shuttering for RCC columns and beams will be in position in such a way that wall panel and floor slab panel of ground floor will be in position. Concreting of
columns, beams, infill of required cavities, micro beams, and screed will be done simultaneously. This process will be repeated on each upper floor. Walls of each floor construction will be done along with rising up structure. It is estimated that this method will reduce 50% dead load which will reduce substantial steel and cement, 8% increased carpet area and saving of 60-70 % time. 9.3 Scattered small and row houses: Quality small houses and row houses for low income and common people which can resist natural disasters at affordable cost is essential for inclusive development. Housing of the masses as well as other segments along with infrastructure alone will determine growth and development of the society or the nation. One BHK housing from 300-500 sft at affordable cost @ Rs 600-700/ sft can be a reality with Rapidwall. At a time when the real estate market is on the downslide due to the economy in recession, many builders who have embarked on mega residential schemes may find affordable housing as a catalyst to tide over the recession period. It need not mean that they need to build houses for low income or middle class alone, but with structures built at affordable cost using Rapidwall and carry out superior finish to meet the requirement of up market and luxury segment may be a good solution and response . While provide more comfortable living, this will also save energy, contribute to environmental protection and fight global warming. 9.4 FACT & RCF tie up: FACT & RCF, two fertilizer giants under public sector are together setting up Rapidwall and plaster products manufacturing plant at Ambalamugal using Rapidwall technologies of Australia called FACT RCF Building products Ltd. (FRBL). FACT has about 7 million tons of industrial by product gypsum. By setting up Rapidwall & Plaster products plant, they intend to produce 1.4 million sqm or 15 million sq ft panel per year and about 50000 tons of superior quality wall plaster and wall putty. RCF is already setting same capacity plant in their Chembur plant to meet the huge demand of Mumbai market. Gypsum based wall plaster and wall putty will be alternative to cement plaster for interior walls and ceiling. This will save river sand, cement and water. It will also provide fine finish. Gypsum based wall putty will be superior product than currently marketed brands of wall putty. These products will also be very useful to the real estate and housing industry.
CONCLUSION Rapidwall Panel provides a new method of building construction in fast track, fully utilising the benefits of prefabricated, light weight large panels with modular cavities and time tested, conventional cast-in-situ constructional use of concrete and steel reinforcement. By this process, man power, cost and time of construction is reduced. The use of scarce natural resources like river sand, water and agricultural land is significantly reduced. Rapidwall panels have reduced embodied energy and require less energy for thermo-regulation of interiors. Rapidwall buildings thereby reduce burdening of the environment and help to reduce global warming. Rapidwall use also protect the lives and properties of people as these buildings will be resistant to natural disasters like earthquakes, cyclone, fire etc. This will also contribute to achieve the goal of much needed social inclusive development due to its various benefits and advantages with affordability for low income segments also. Fast delivery of mass dwelling/ housing is very critical for reducing huge urban housing shortage in India. Rapidwall panels will help to achieve the above multiple goals.
BIBILOGRAPHY http://www.bmtpc.org/DataFiles/CMS/file/PDF_Files/24_G FRG_Panel_FRBL.pdf http://www.google.com/patents/US6878321?hl=en&output =html_text http://mhupa.gov.in/W_new/11_Meher%20Prasad_Tech% 20for%20Mass%20housing.pdf http://www.youtube.com/watch?v=UUQEUcB7cMM
