新型磷渣硅酸盐水泥的水化特性

新型磷渣硅酸盐水泥作为一种新型结构材料,巳投入批量生产和应用。考虑到达种水泥系采用含有Na_2SO_4的矿物CNS代替石膏作水泥调凝剂,并且磷渣带入的少量P_2O_5将对水泥的水化过程产生一定影响,作者采用XRD,SEM及反应过程分析等手段对新型磷渣水泥的水化恃性进行了研究,发现其水化过程与普通矿渣水泥有些不同,主要表现在:(1)CNS加速了AFt的形成及水泥矿物的水化;(2)CNS促进了AFt的分散及磷渣的溶解反应;(3)磷渣玻璃体的结构特征决定了新型磷渣水泥中的AFt能够长期稳定存在。因此使其具有正常的初凝时间和较高的早期强度。

HYDRATION FEATURES OF NEW PHOSPHOROUS SLAG CEMENT

As a new construction material, phosphorous slag cement has been made in batch production. Differing from ordinary slag cement, a kind of mineral (CNS) mainly containing Na_2SO_4 is used in the cement as a retarder instead of gypsum. Because of the influence of CNS and phosphor, there must be some difference in hydration process between phosphorous slag cement and ordinary slag cement. In this paper, the hydration features of phosphorous slag cement are investigated by means of XRD, SEM and reaction kinetics determination. It is found that: (1)CNS accelerates the formation of AFt and hydration of clinker; (2)CNS promotes the dispersion of AFt and solubility of slag; and (3)the structure features of phosphorous slag also make AFt stable in cement paste for a long period. Therefore, phosphorous slag cement has a higher early strength.