【摘要】 随着水泥基材料的技术进步和工程需求,混凝土强度的越来越高,水胶比越来越低。活性粉末混凝土的水胶比已降至0.16以下,水胶比0.10的浆体材料也已经可以制得[1]。本论文用结合水量法测试了不同水胶比、不同矿物掺料与不同龄期下超低水胶比水泥石的水化进程及Ca(OH)2含量。研究表明:超低水胶比水泥浆体材料的水化程度极低。当水胶比为0.16时,180天标准养护的水泥石,其结合水量仅为13.52%,水胶比0.10时,只有12.04%;研究证实,超低水胶比下,超细矿渣和磨细石灰石粉加快了水泥石的水化进程。水胶比相对较高时,水化产物中Ca(OH)2含量相对较小,表明此时掺合料的火山灰反应更充分;矿渣和石灰石粉等量取代水泥后,更降低了Ca(OH)2的含量。更多还原

【Abstract】 With the development of technology of cement-based materials and the urgent need to meet the demand of engineering,the concrete strength become higher due to the water/cementitious materials ratio getting lower.The Reactive Powder Concrete with generally less than 0.16 W/B has been prepared,and the cement paste material of 0.10 W/B was obtained^[1].The objective of this paper was to measure the hydration progress of cement paste with extreme-low W/B under condition of different mineral additives and curing ages.It is identified that the hydration degree of cement paste was very low with the results of non-evaporable water of 13.52% in case of 0.16 W/B,and 12.04% in case of 0.10 W/B at 180 days age.It was also concluded that ground granulated blast furnace slag and limestone powder accelerated the hydration of cementitious materials.The test results of Ca（OH）₂ content show that more pozzolanic reaction of cementitious materials was produced in condition of higher W/B,and the ground granulated blast furnace slag and limestone powder replacement of cement improved this reaction further.更多还原