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Weathering Course and Roof Finish After laying the R.C.C. roof slab the following sequence has to be followed for weathering course etc. 1. Brick jelly lime concrete for weathering course must be laid and tamped with wooden beaters for proper consolidation. 2. For finishing the top of RCC roof, only 200 mm x 200mmx20 mm machine pressed tiles with combination mortar 1:1:6 admixed with Waterproofing compound @140 ml/bag should be used as per Standard Specification ...Read More
Plastering The plastering for interior walls and flooring must be finished absolutely smooth with a steel trowel and the plastering for the outer side of the walls and flooring exposed to the sun must be finished with wooden float and must be left somewhat rough, but uniformly rough without variations. The corners and edges in plastering must be given sharp edge finishing with cement mortar 1:3. Types of Plaster 1. Lime Plaster. 2. Cement Plaster ...Read More
Guidelines for tying reinforcement: There are six common ways of tying reinforcement bars. Slabs and Walls Perimeter bar should be tied at every intersection; for bars up to and including 20mm, the alternate intersection should be tied. For bars of 25mm or larger diameter, they may be tied at greater centers. Cantilevers Top reinforcement in cantilevers should generally be located by the use of chairs. Beams Every intersection of a corner of a link with ...Read More
Characteristic Strength of Reinforcement Bars Below shared the important table for Characteristic Strength of Reinforcement Bars. Types of Reinforcement characteristic strength (yield stress of 0.2% proof stress) N/ mm2 Ultimate tensile stress, N/mm2 Minimum elongation on gauge length of 5.65 x sq.rt Cross – Sectional area (%) Mild steel of grades I II 255 236 231 211 412 373 20-23 20-23 Medium tensile steel 353 348 323 538 17-20 Cold worked deformed bars 415 15% more than the ...Read More
CONCRETE: The manufacture of concrete involves several operations, over each stage of which careful control needs to be exercised. Proportioning of Materials In general cement, water, fine aggregate, and coarse aggregate should be so proportioned that the resulting concrete has the following properties. While fresh, it is workable enough for economical and uniform placement but not excessively fluid. When hardened, it has sufficient strength and durability for its purpose. It involves a minimum cost for ...Read More
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