胶凝的
火山灰反应
水合硅酸钙
火山灰
水泥
化学工程
火山灰活动
溶解
硅酸钙
材料科学
熟料(水泥)
降水
化学
矿物学
无机化学
硅酸盐水泥
冶金
复合材料
物理
气象学
工程类
作者
Tiao Wang,Satya Medepalli,Yuqian Zheng,Wei Zhang,Tetsuya Ishida,Shashank Bishnoi,Dongshuai Hou,Zhenguo Shi
标识
DOI:10.1016/j.cemconres.2023.107416
摘要
Clinker hydration at later age in blended cement pastes was found to be retarded by the pozzolanic reaction of low-calcium supplementary cementitious materials (SCMs). Various mechanisms were explored, including the consumption of pore solution, the presence of foreign ions, and pH-related effects. Experimental results indicated that the dissolution of the foreign ions from SCMs was a secondary effect. The primary cause of the retardation effect was the reduction in pH caused by the pozzolanic reaction. Aqueous precipitation tests yielded the following findings related to pH: (1) At lower pH levels, the precipitation of aluminium-incorporated calcium silicate hydrate(C–A–S–H) gel was reduced due to the decreased nano-adhesion force. (2) The morphology of C–A–S–H gel consisted of small spherical particles at lower pH levels, resulting in a denser capillary pore structure. The latter led to increased water retention within the fine gel pores but a reduced amount of pore solution available in the capillary pores for cement hydration.
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