【摘要】 决定水泥石强度的主要因素是水化物生成量和水泥石的致密度。过大的水灰比,虽然有利于水化物的增长,但同时增加水泥石的剩余毛细孔容积,对强度不利。对固定原水灰比的不同龄期的水泥石来脱水泥石的强度与胶/空间比值成一定的直线关系,只是,原始水灰比不同的水泥石,即使胶/空间比值相同,强度也不会相等的。水化过程中单分子层吸附水量V_m与化学粘合水量W_n的比值即Vm/W₂₂也不是—个恒定值,水化早期W_n增长较快,而水化后期V_m增长较快。晶体水化物起着水泥石结构的骨架作用,后期生成的胶体水化物则是填充已经形成的结构的间隙空间,增加了水泥石的强度。关于强度与胶/空间比值的关系和V_m/W_n的比值,作者与T.C.Powers提出了不同的观点。更多还原

【Abstract】 From the physical point of view, the strength of cement paste is determined by the amount of hydration products and porosity. Paste of excessively high original W/C ratio. though yields a greater amount of hydration products, has a higher capillary porosity and is, therefore, lower in strength. The strength of hardened cement paste varies linearly with the gel-space ratio is true only as regard to pastes of various ages but not with pastes of different W/C ratios. Nor is the ratio of the amount of water of monolayer adsorption Vm to the amount of combined water W_n, i. e., V_m/W_n a fixed values thoroughout the period of hydration. The rate of increase in W_n is greater at earlier ages, whereas the rate of increase in Vm is greater at later ages. Crystal hydration products act as skeletal element of the structure of the paste, whereas the colloidal hydration products of the later ages adds to the strength of the structure by filling the interstices of the already formed structure. The authors derive differentconclu-sions with regard to the relation between gel-space ratio and strength of hardened cement as well as the Vm/Wn ratio pastulated by T. C. Powers.更多还原