The light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1 , wherein the said additives is present in an amount of 0.01 to 2%. Long fibres can be used, but require a different (more difficult) manufacturing process and result in weaker products. Plymouth The fixing shall be done with the same hook bolts which secure the sheets to the purlins. 16. 11.03,11.05,11.07,11.08,11.12, 11.15. A process for manufacturing light weight and high strength non-asbestos corrugated fiber cement roofing sheets comprising; preparing a slurry; subjecting the said slurry to the step of forming thin films, applying the said thin films on accumulator rolls, pre curing and curing in autoclave to produce the product. The specimens are subjected to expose for 50 cycles. In this invention flat fiber cement boards are manufactured by using bauxite and wood pulp by autoclave method. Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When this has been done, ensure the sealing washer has been tightened correctly to prevent the ingress of water. The finished roof shall have a uniform slope, and the line of corrugations shall be straight and true. Over a period of time and at predetermined temperature, the initial curing in the composite make it strong and acquire enough strength for demoulding. Laying of Corrugated Asbestos Cement Roofing Sheets, Fixingof Corrugated Asbestos Cement Roofing Sheets, Wind Tiesin Asbestos Cement Roofing Sheet. The invented product meeting all the Please note that mitring should occur on the ground, never on the roof or scaffolding. If the product contains fibers other than asbestos and is to be formed on a Hatschek or other type of wet forming machine, it may contain clay in an amount of between about 2% and 15% by weight, and poly(ethylene oxide) homopolymer in an amount of between about 0.03% and 0.5% by weight. Lost your password? (Some cookies are necessary in order for our website to work properly.). We use this information to improve our website and provide a better user experience. Mineral fibers is naturally occurring mining product. solids do not settle so that the lamination having uniform distribution of the binder and the reinforcing fibers is obtained in the process. J-hooks are used to fix angle iron purlins, L-hooks are used for fixing to RS joists, timber, or. The light weight and high strength non-asbestos corrugated fiber cement roofing sheets wherein the length of sepiolite used is in range of 1-25 mm and woliastonite has the aspect ratio 5 to 50. is reduced tremendously. Twice the No. Sign up today for a cash or credit account and exclusive discounts with a CMO Trade Account. All Rights Reserved. US 4377415 relates to a cement-wollastonite product consisting essentially of Portland cement binder in an amount of between about 40% and 90% by weight, and wollastonite in an amount of between about 10% and 60% by weight. of sheets in the horizontal course. Light weight & high strength non-asbestos corrugated fiber cement roofing sheets manufactured by autoclave method. 17. Fibers texture of sepiolite makes it suitable for reinforcement. The part quantity of cement was replaced with GGBS slag and fly ash. Choose how to get in touch! Hence it is essential to develop corrugated sheeting product with alternative fibers with similar strength of asbestos based and cost effective. For this reason, it is important to always use crawling boards or walkways and roof ladders. Similarly micro silica has been replaced with high surface area fly ash for cost reduction and addressing the processing problems by maintaining cone and sieve filtrate solids. The light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1 wherein the said cellulose fiber is selected from jeans cotton rag, waste cotton, virgin cotton used alone or in combination. It has been determined by way of compression of the invented light weight & high strength non-asbestos fiber cement corrugated roofing sheets produced by autoclave method in this invention are having better toad bearing capacity than that of conventional asbestos and non-asbestos fiber cement corrugated roofing sheets. 1. The present invention relates to light weight & high strength non-asbestos corrugated fiber cement roofing sheets manufactured by autoclave method. Ref document number: We claim that the compositions claimed in claims 1 to 13 can also be used for making non asbestos fiber cement flat sheets/boards. 2) Frost Resistance: The corrugated sheets are subjected freeze thaw cycles cooling to -20C within 1 to 2 hours and holding for 1 hours. 4) Warm Water: The specimens are exposed to warm water having temperature 60C for 56 days and exposed sheets are meeting standard requirement. Weve put together a quick guide to the fitting of fibre cement roof sheets to help demonstrate the process. The frame is removed, the edges of the mortar layer trimmed and the screeding board tilted, such that the polythene sheet with the wet fibre concrete is allowed to gradually slide onto the corrugated mould held below. This is only for some specific products, such as the Cembrit B5 or Eternit Profile 6. It is cut from a point 150 mm up the vertical side of the sheet to a point 50 mm long along the horizontal edge. One more object of the present invention is to maintain cone and sieve filtrate solids to address the process problems by replacing micro silica with high surface area fly ash, rice husk ash and fine ground silica. The present invention provides the method to manufacture of Light weight and high strength Non asbestos fiber cement corrugated sheet comprising of the processing reinforced fibers such as herein described. Need more Help & Advice? The last or top row sheets shall have the bottom right-hand corner cut, with the exception ofthe last sheet, which shall be laid uncut. These cookies are essential for the use of the features and services on our website. A light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1, wherein wollastonite is optionally modified with additive such as Vinyl silane, Amino silane, glycidoxy silane and Vinyl acetoxy silane either alone or in combination in an amount of 0.1 to 3% of wollastonite weight. Speak to our Super team today on 01752 692 760. Types of Foundation for Buildings and their Uses [PDF], Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results, 16 Types of Heavy Equipment Used in Construction, Methods of Rainwater Harvesting [PDF]: Components, Transport, and Storage, Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Saudi Arabia's Mirrored Skyscrapers to House Nine Million People. If working in wet or windy weather, or after poor weather, roofing sheets can be slippery, making handling difficult. 7. These cookies help us understand how people use our website. Cookies are small text files that are stored on your computer or other device by websites that you visit. On low pitched roofs, it is important to seal the overlaps with butyl strips. Moulding and curing: same as for sheets. Standard Specifications of Hollow and Solid Concrete Blocks. fibers were replaced with cotton pulp, modified or unmodified wollastonite and modified PET fiber. The recipe thus obtained in respect of the above formulations were independently run on pilot plant and plant sheet forming machine such as HATSCHECK MACHINE where thin films are picked up and superimposed on We use cookies to enhance your experience, analyse site usage, and for marketing purposes. On each purlin, there shall be one hook bolt on the crown adjacent to the side lap on either side. An attempt has been made replace part or full quantity of PET fibers with alternative fibers like mineral fiber, sepiolite, Jute fiber, bamboo fiber etc. They collect information such as which pages on our website visitors go to most often, which features they use, and which websites people have visited before they visit ours. The process of the invention and its advantage will now be explained in greater detail with reference to the known method of manufacture of such sheets for clear and better understanding of the invention. Further information about the types of cookies that are used on our website is set out in the box below. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. After laying down the other adjacent sheets, the nuts shall be tightened to full capacity to ensure a leak-proof joint. Accuracy in the corrugations is vital for proper installation and trouble-free performance. These cookies are likely to be performance cookies or targeting cookies (as described below). Weve answered our most commonly asked questions for you so you can get the information you need, including returns and how to use our site. Asbestos is a naturally occurring mining product. Further object of the present invention is to use sepiolite, mineral fibers, jute fiber and bamboo fiber to replace part quantity or full quantity of modified PET fibers. View All Access Hatches & Kerb Extensions, Pitched roof windows buyers guide, How to install Vistalux corrugated PVC roof sheets. The sheets in the intermediate rows, except the end sheets, shall have both the top left-hand corner and bottom right-hand corner cut. How to Install Corrugated Asbestos Cement Roofing Sheets? Mitring roofing sheets involves the cutting of opposite corners of roof sheets to prevent four overlaps of roof sheet from occurring. Alternatively, nibs with wire loops can be cast-in during moulding, avoiding the need for drilling. The filler may be waste fiber-cement product or inert filler material. Country 1) Water impermeability: No water droplets observed after 24 hours underneath of the corrugated sheet. What is the tolerance for compression test results of concrete, according to the standards? Let us know if you liked the post. 19 mm by using microspheres, calsil, polymeric beads, expanded vermiculite/perlite/shale and their combinations. Short fibres, chopped to lengths of 12 to 25 mm, are easy to process, provide cohesiveness to the wet mortar, permitting reshaping without cracking, and also help to prevent cracking due to drying shrinkage. A light weight and high strength non-asbestos corrugated fiber cement roofing sheets comprising, Portland cement, pozzolonic filler material, fibrous reinforcing material, bentonite clay and additives wherein said fibrous reinforcing material is a combination of plurality of fibers having 8 to 20% of cellulose fiber, 0 to 3% of modified PET fibers.O to 3 % rock wool/modified rock wool fibers and 0 to 6% other fibers optionally containing organic fibers like jute & bamboo and mining fibers selected from wollastonite modified or unmodified, sepiolite, and mineral fiber. Thawing in water to ambient temperature within 1 to 2 hours and holding for 1 hour. The said reinforcing fibers essentially included Cellulose Pulp having fiber opening Deg.SR 12 - 50 used in an amount of 8-20%, modified PET fibers 0 to 3% and wollastonite/modified wollastonite is having the aspect ratio 5 to 40 in an amount of 0.25 to 10%, sepiolite 0-5%, mineral fibers 0-5%, jute fibers 0-5%, bamboo fibers 0-5%, modified rock wool fiber 0-5%, Portland cement in an amount of 20 to 55%, Siliceous material in the binder essentially pulverized fly ash having surface area of 2000-4000 cm. At ridge when corrugated sheets and ridge pieces are secured by the same bolt. When fitting fibre cement roof sheets, there is a certain way in which they should be laid to minimise any damage or breakages over time. Present invention - pilot plant trials, Example Example Example Example Example Example 5 6 7 8 9 10, 20-60 20-60 20-60 20-60 20-60 20-60 cement, SSA : 2000-4000 15-55 15-35 15-55 15-55 15-55 15-55 cm, Jeans cotton rag 4-12 8-20 8-20 8-20 8-20 8-20, Benton ite 1 to 5 1 to 5 1 to 5 1 to 5 1 to 5 1 to 5, Additives 0.01 to 2 0.01 to 2 0.01 to 2 0.01 to 2 0.01 to 2 0.01 to 2, Size: Lengthxwidthxthickness 1270 x 575 x 6 mm. Yet another object of the present invention is to improve the bonding between the layer at green stage by incorporation of bentonite in the formulations. Indian Patent 279236 describes the manufacturing of light weight cementicious cellulose fiber reinforced building material without using any low density additives. The holes for hook bolts shall be drilled and not always punched through the crown of the corrugation and not in valleys, to suit the purlin's position. The light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1 , wherein the said Bentonite is an amount of 1 to 5% by weight. Our site is closed to the public. In this case, the second butyl strip should be around 100-200mm below the fixing. Another object of the present invention is to replace asbestos fibers, wood pulp, PVA, modified Poly propylene fibers, micro silica and part replacement of cement to make it light weight and high strength Non Asbestos fiber cement corrugated roofing sheets. Therefore, care must be taken in constructing the substructure, to ensure that the top edges of all members are properly aligned. It seems you are running an older version of Internet Explorer. The roof ladders or planks shall always be used when laying and fixing the sheets to avoid damage to the sheets and provide safety to the workmen. Make your job easier with product guides and how-to project guides, plus keep up-to-date with the latest from cmostores.com. Still another object of the present invention is to use more quantity of Cellulose fibers and high aspect ratio Wollastonite/modified wollastonite to replace asbestos fibers, Modified poly propylene and PVA fibers. Water: preferably drinkable water, just enough to make the mortar mix workable (water: cement ratio 0.5-0.65 by weight). In the following paragraphs, wherein the term cellulose pulp is referred, it the cellulose pulp, which is obtained by mechanical pulping of waste jeans cotton rags or other natural cotton in loose or cloth form. Fibre cement sheets are popular due to their comprehensive range of uses, from agricultural and industrial use to domestic and commercial uses, but how are they installed? The above combination of fiber and fillers the end product can't be subjected for hydrothermal curing (autoclave) only Air cured/ water cured method to be adopted. 2. What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? While making slurry, care was taken to ensure there was homogeneous mixing of siliceous material, additives and cement with reinforcing fibers. Do you need planning permission for a loft conversion? 15. Devon PL5 3LX. The light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1 wherein the additives used are pan gel, plasticizers, superplasticizers, flocculating agents, defoamers, water reducing admixtures of silicone or acrylic base in an amount of 0.01 to 2% by weight. they do not house the technology that allows our site to be safe and secure. CMOStores.com Limited is not responsible for the content of external sites. If, for any reason, such as on the consideration of the direction of prevailing winds, laying is to be started from the bottom right-hand corner; then, the whole procedure should be reversed. US6284815B1 teaches us a non-asbestos friction material is disclosed, which comprises a non-asbestos fibrous reinforcement, a thermosetting resin binder, and a filler as the main components, wherein the fibrous reinforcement is a combination of plural kinds of non-asbestos fibers and contains sepiolite fibers, cellulose fibers, and an acryl pulp as the fibrous reinforcement. * Subject to status. If nails or bolts are used, holes (of slightly larger diameter) should be drilled beforehand. In accordance to this invention there is also provided a process for manufacturing light weight and high strength non-asbestos corrugated fiber cement roofing sheets comprising; preparing a slurry; subjecting the said slurry to the step of forming thin films, applying the said thin films on accumulator rolls, pre curing and curing in autoclave to produce the product. Asbestos cement sheets are popularly used as a low-cost roofing material. View All Insulation Fixings & Accessories. As well as the options provided below, you can choose to restrict or block cookies through your browser settings at any time. Roofing Superstore For more information please read our Rice husk ash is an ash produced by controlled burning of grounded rice husk which contains amorphous silica. Terms and conditions apply. After curing is over, cured material in the trolleys is pulled out and stacked in ambient condition for further inspection and dispatch. How do I stop moss growing on shingles and tiles? Further information: RAS c/o SKAT, Vadianstrasse 42, CH-9000 St. Gall, Switzerland; Bibl. Australian patent 2008348271 A1 illustrates the manufacturing of structural fiber cement building materials with density less than 1 .25 g/cc & thickness less than The free overhang of the sheets shall not exceed 300 mm. When you join you get additional benefits. 13. The product may also contain silica and/or filler in an amount of between about 10% and 40% by weight for replacing part of the wollastonite. By using fine fly ash and high aspect ratio modified/unmodified wollastonite in example 4 achieved the superior properties compared to conventional asbestos and non- asbestos fiber cement corrugated roofing sheets. Similarly wherein the fly ash is referred, it means the fly ash generated during the combustion of pulverized coal in the thermal power plant. Alternatively, use self-drilling or self-tapping top fix fixings. Whats the difference between a beam and a joist? The light weight and high strength non-asbestos corrugated fiber cement roofing sheets as claimed in claim 1 wherein wood pulp optionally can be used along with said cellulose fiber selected from jeans cotton rag, waste cotton, virgin cotton used alone or in combination.