12/6/2023 0 Comments Cement plaster specifications![]() Laying of Fresh ConcreteĪfter batching of concrete, lay it down slowly on the farm work. If vibrator is used for concrete compaction, then decrease the water amount as per engineer in charge orders. Following amount of water should be used against 50kg cement bag. Excess amount of water decreases the strength of concrete and also concrete ingredients get separate very easily. Concrete ConsistencyĬoncrete consistency depends on water to cement ratio. While, hand mixing is preferred as it is economical for smaller concrete works. ![]() Mixing machine is used for large scale construction works. Don’t compact coarse aggregates while proportioning. Continuously measure moisture content during construction work and add extra volume of sand according to the amount of moisture. Measure the moisture content in sand and add extra volume of sand. Consider dry sand while calculation of proportioning. Volume of one cement bag is 1.25 cubic foot.īulking of sand should be under consideration while measuring sand proportion. Make a standard measuring box according to the volume of one cement bag. ProportioningĬement, sand and coarse aggregates should be measure according to their fixed proportions. It should not pass through the sieve size of 5mm and coarse aggregates should be graded. Size of coarse aggregates should meet the approved construction work requirements. It should be clean and free from any irrelevant organic matters. Shape of coarse aggregates should not be laminated and elongated. Aggregates shape should be cubic or closed to cubic shape. These stones should be hard, tough, durable and clean. Generally, pieces of igneous rocks are used as coarse aggregates. Stone dust can also be used as fine aggregate in cement concrete, but before use make sure that it is as per specifications. Sea sand is prohibited for construction work, because of high salt contents. Sand should be clean, free from dust and organic matters. Size of sand particles should be such that it passes through 4.75mm sieve. ![]() Sand particles should have coarse, sharp and angular edges. Sand is used as fine aggregate in cement concrete. Cement used for construction work should be fresh and it should meet the standard specifications. CementĬement is the basic and most important ingredient of cement concrete. While writing detailed specifications, explain the specifications of every single ingredient in detail. Cement concrete is composed of cement, fine aggregates, coarse aggregates and water. ![]()
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