碱激发-大矿物掺合料体系作为预制混凝土(PC)胶凝材料的环境效应研究  

Environmental Impact of Alkali-activated Large Mineral Admixture System as a Substitute for Cementitious Material in Precast Concrete(PC)

作　　者：周昱程 胡立成 高洪波[3] ZHOU Yucheng;HU Licheng;GAO Hongbo(Hainan Hujian Construction Co.,Ltd.,Haikou 571157,Hainan,China;Shanghai Construction Group Co.,Ltd.,Shanghai 200080,China;Hainan University,Haikou 570228,Hainan,China)

机构地区：[1]海南省沪建建设有限公司,海南海口571157 [2]上海建工集团股份有限公司,上海200080 [3]海南大学,海南海口570228

出　　处：《建筑施工》2024年第4期447-450,共4页Building Construction

基　　金：海口市科技计划项目(2022-036)。

摘　　要：研究一种碱激发-大矿物掺合料体系作为预制混凝土(PC)的胶凝材料的替代品,其可以大量地减少水泥用量,同时确保早期的出厂强度。结果表明,当Na_(2)SiO_(3)和NaOH组合激发剂的SiO_(2)/Na_(2)O=1.5,Na_(2)O含量为4%时,碱激发-大矿物掺合料胶凝体系的早期强度与蒸养水泥相近,其主要原因是碱激发-大矿物掺合料胶凝体系与蒸养水泥内部发生了相近程度的化学反应,微观结构具有一致的密度,两者的差别主要在于碱激发-大矿物掺合料净浆是N-A-S-H与C-A-S-H组合的复合型凝胶,而水泥净浆则以C-A-S-H为主。采用碱激发-大矿物掺合料胶凝体系作为PC的胶凝材料,可以降低30%以上的CO_(2)排放。This study investigates an alkali-activated large mineral admixture system as a replacement for cementitious materials in precast concrete(PC).This system has the potential to significantly reduce the use of cement while ensuring early factory strength.The findings indicate that when the SiO_(2)/Na_(2)O ratio of Na_(2)SiO_(3) and NaOH is 1.5 and the Na2O content is 4%,the early strength of the alkali-activated large mineral admixture cementitious system is similar to that of steam-cured cement.The primary factor is that the alkali-activated large mineral admixture cementitious system exhibits a comparable level of chemical reaction to steam-cured cement,resulting in a consistent microstructure density.The alkali-activated large mineral admixture paste forms a composite gel of N-A-S-H and C-A-S-H,whereas the cement paste is primarily characterized by the dominance of C-A-S-H,which is the main difference between them.Using an alkali-activated large mineral admixture cementitious system as the cementitious material of PC can lead to a reduction in CO_(2) emissions by more than 30%.

关 键 词：半地质聚合物 碱激发 砂浆 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]