铝酸盐水泥对硅酸盐水泥性能及浆体结构的影响  

Effect of Calcium Aluminate Cement on Hydration Properties and Microstructure of Portland Cement

作　　者：徐玲琳[1] 王培铭[1] 吴广明[1] 李楠[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《同济大学学报（自然科学版）》2015年第5期736-740,753,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51402216);硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2014-10);"十二五"国家科技支撑计划(2012BA20B02)

摘　　要：研究了铝酸盐水泥(质量分数0.25以内)与硅酸盐水泥混合体系的凝结时间、力学性能和干燥收缩率,并采用量热仪、X射线衍射仪、环境扫描电镜探讨了这些物理力学性能产生差异的原因.研究表明,随着铝酸盐水泥掺量的增加,混合体系的凝结时间不断缩短,力学强度先略升(6%左右时达到最高)后大幅降低,干燥收缩不断增加.少量铝酸盐水泥的掺入,对硅酸盐水泥的水化影响不大,仅造成水化早期浆体钙矾石的生成量微增;但掺量超过一定值时,将显著延缓硅酸盐水泥的水化,浆体中钙矾石不断转化为单硫型水化硫铝酸钙,非稳态水化铝酸钙也逐步发生晶型转变,从而导致微结构明显劣化.Setting times,mechanical strength and drying shrinkage ratio of Portland cement and calcium aluminate cement（less than 25％） blended systems were investigated,which were also characterized by means of calorimetry,X-ray diffraction and environmental scanning microscopy.Results show that with the increasing of calcium aluminate cement,setting times of blended systems is shortened;the compressive strength first increases slightly （reach the utmost with 6％ of calcium aluminate cement） and then decreases significantly,and the drying shrinkage grows continuously.In addition,except that the ettringite formation content increases slightly,lower content of calcium aluminate cement do not have obvious impact on the hydration of Portland cement;while higher content will delay the hydration of Portland cement prominently,furthermore,the ettringite formed at early age also transfer to monosulphoaluminate and the unstable calcium aluminate hydrates transfer to stable garnets,which does great harm to the microstructure.

关 键 词：铝酸盐水泥 硅酸盐水泥 水化 机理 性能 

分 类 号：TU528.41[建筑科学—建筑技术科学]