By Fan T.-H.
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Extra info for A Bayesian analysis for the seismic data on Taiwan
50 c. 45 for normal weight concrete. 38 t 5000 t t With most materials, water-cement ratios shown will provide average strengths greater than required. This table should be used only with special permission from the design engineer. It is not intended for use in designing trial batches. Use the table below for trial batch design. t For strengths above 4500 psi (non-air-entrained concrete) and 4000 psi (airentrained concrete), concrete proportions shall be established from field data or trial mixtures.
Natural wear and weathering will cause some change in the appearance of concrete over time, but in general, durability also includes the maintenance of aesthetic as well as functional characteristics. Just as concrete mix designs can be adjusted to produce a variety of strengths, appropriate concrete ingredients, mix proportions, and finishes can and should be adjusted on the basis of required durability. Volume Stability: All materials expand and contract with changes in temperature, and porous materials like concrete also expand and contract with changes in moisture content.
In mortar and grout mixes, the ratio is permitted to be greater because the masonry units absorb some of the water out of the mix. In concrete, the water to cement ratio greatly influences durability, watertightness, and strength. 4. Concrete curing is important because gains in both strength and watertightness continue for years after placement, if curing is continued. The greatest gains occur during the first one to two weeks after placement, when curing is most important. Uncured concrete dries out and may reach only half of its design strength.