偏铝酸钠对单组分地聚水泥的性能调控及水化机理  

Performance and Hydration of One-part Geopolymer Activated with NaAlO_(2)

作　　者：唐宁[1] 王延军 赵明宇 孙艺涵 王晴[1] TANG Ning;WANG Yanjun;ZHAO Mingyu;SUN Yihan;WANG Qing(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Zhejiang Scientific Research Institute of Transport,Hangzhou 310023,China)

机构地区：[1]沈阳建筑大学材料科学与工程学院,沈阳110168 [2]浙江省交通运输科学研究院,杭州310023

出　　处：《材料导报》2024年第8期144-149,共6页Materials Reports

基　　金：国家自然科学基金(52278453,52278266);辽宁省自然科学基金(2021-MS-245);兴辽英才计划(XLYC2007176)。

摘　　要：地聚水泥是一种新型胶凝材料,与普通硅酸盐水泥相比,具有绿色环保、节能低碳、性能优异等诸多技术优势。目前,地聚水泥主要由原材料粉体与碱溶液双组分混合所得,导致腐蚀性和高粘度碱溶液运输条件苛刻,且现场施工不易控制,因而在土木工程中难以大规模应用。本工作以偏铝酸钠(NaAlO_(2))对单组分地聚水泥的性能调控及水化机理为研究目标。在地聚水泥中,将碱溶液改为固体碱激发剂,并引入原材料粉体质量2%的NaAlO_(2)改善其工作性能。研究表明,NaAlO_(2)水解速度快,可在反应初期产生富Al反应环境,并快速形成水化硅铝酸钙,使得单组分地聚水泥在强度不变的情况下,凝结时间得到延长,工作性能得到改善,且微观结构也趋于凝胶化、致密化。可见,少量NaAlO_(2)的引入有利于突破当前双组分地聚水泥的应用技术瓶颈,推动地聚水泥在工程中的大规模应用。Geopolymer is a new type of cementitious material.Compared with ordinary Portland cement,it has many technical advantages such as green environmental protection,energy saving and low carbon,and excellent performance.At present,geopolymeris manufactured with two-parts materials including alumina-silicate materials and aqueous alkali,which leads to harsh transportation conditions,and difficult to control construction in site.Therefore,it is difficult to apply in civil engineering on a large scale.In view of this,the present work aims to study the performance regulation and hydration mechanism of NaAlO_(2)on one-part geopolymer.In the raw materials of geopolymer,the alkali solution was changed to a solid alkali activator,and NaAlO_(2)with 2%of raw material powder was employed to improve its workability.The results reveal that NaAlO_(2)has a fast hydrolysis rate,and it is easy to generate an Al-rich reaction environment in the early stage of the reaction,and quickly form hydrated calcium aluminosilicate,so that the one-part geopolymer can prolong the setting time without changing the compressive strength,and the microstructure also tends to gel and densify.Hence,the adding of a small amount of NaAlO_(2)is conducive to breaking through the technical bottleneck of the current application of two-parts geopolymer and promoting the large-scale application of geopolymer in engineering.

关 键 词：地聚合物 水泥 单组分 偏铝酸钠 水化机理 

分 类 号：TU52[建筑科学—建筑技术科学]