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A higher ratio gives a too fluid concrete mix resulting in a too porous hardened concrete of poor quality. Often, the concept also refers to the ratio of water to cementitious materials, w/cm. Cementitious materials include cement and supplementary cementitious materials such as ground granulated blast-furnace slag (GGBFS), fly ash (FA), silica ...
6.9 23 18 12 — Fe 2 O 3: 3 11 6 1 — CaO 63 5 21 40 < 1 MgO 2.5 — — — — SO 3: 1.7 — — — — Specific surface (m 2 /kg) [d] 370 420 420 400 15,000 – 30,000 Specific gravity 3.15 2.38 2.65 2.94 2.22 General purpose Primary binder Cement replacement Cement replacement Cement replacement Property enhancer
The output obtained from a site mix concrete plant using a 8/12 mixer is 4 to 5 metric cubes per hour which is 30-60 metric cubes per hour in a ready mix concrete plant. Better handling and proper mixing practice will help reduce the consumption of cement by 10 – 12%.
dry-mix – the dry mixture of cement and aggregates is filled into the machine and conveyed with compressed air through the hoses. The water needed for the hydration is added at the nozzle. wet-mix – the mixes are prepared with all necessary water for hydration. The mixes are pumped through the hoses.
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When water is mixed with portland cement, the product sets in a few hours and hardens over a period of weeks. These processes can vary widely, depending upon the mix used and the conditions of curing of the product, [18] but a typical concrete sets in about 6 hours and develops a compressive strength of 8 MPa in 24 hours. The strength rises to ...