土木工程师参考手册-4b-材料Materials.pdf

Table 4.8 Coefficients of thermal expansion 4.2.6 Curing 6 If newly hardened concrete is to achieve its potential strength Coarse Thermal expansion coefficient ( x 10 /°C and durability, the hydration of the cement must be allowed to aggregate I rock group (microstrainfC) continue for as long as possible. The detrimental effects of Rock Saturated concrete inadequate curing on the durability of reinforced concrete may take many years to become apparent and therefore the relevance Chert or flint 7.4-13.0 11.4-12.2 at the time of casting the concrete may be overlooked . For this Quartzite 7.0-13.2 11.7-146 purpose an excess of water must be present in the pores of the Sandstone 4.3-12. 1 9.2-13.3 concrete and the act of ensuring that this is so is curing . The Marble 2.2-16.0 4.4^7.4 excess water normally present in the concrete is enough to Siliceous limestone 3.6-9.7 8.1-11.0 provide curing except in the case of very dry mixes, but near the Granite 1.8-11.9 8.1-10.3 surface of a member it will escape by evaporation unless