活性物质对混凝土表面抗渗性能影响研究  

Research on the influence of active chemicals on the surface impermeability of concrete

作　　者：韩慧超 赵同峰[2] 李磊[2] 武轶彬 HAN Huichao;ZHAO Tongfeng;LI Lei;WU Yibin(China Second Metallurgical Group Corporation Limited,Baotou 014060,China;Liaoning Provincial College of Communications,Shenyang 110122,China)

机构地区：[1]中国二冶集团有限公司,内蒙古包头014060 [2]辽宁省交通高等专科学校,辽宁沈阳110122

出　　处：《混凝土》2024年第11期122-125,共4页Concrete

基　　金：自治区重点研发和成果转化计划(2023YFHH0085);自治区重点研发和成果转化计划(2023YFHH0086);创建国家自主创新示范区项目(XM2023XTGXQ02)。

摘　　要：采用正交试验,以14 d一次抗渗压力和28 d二次抗渗压力提升率为评价指标,确定了硅酸钠、碳酸钠、偏铝酸钠和催化剂4种活性物质的最优组合,并采用XRD、SEM和EDS对其水化产物进行了分析。研究结果表明:最优组合A3B2C1D3的14 d一次抗渗压力为1.38 MPa,比基础空白试件相比提升了112.3%;最优组合为A2B3C2D4的二次抗渗压力提升率为31.42%;XRD分析表明水化产物中未出现新的特征峰,亲氧化钙含量减少,水化硅酸钙凝胶增多;SEM和EDS分析表明活性物质能够在氢氧化钙表面和裂缝中生成大量的絮状水化硅酸钙凝胶,封堵了水化产物中的微裂纹和毛细孔,水化产物中硅元素含量增加,钙元素含量下降,C和Al略微增加。Using orthogonal experiments,the optimal combination of four active substances,sodium silicate,sodium carbonate,sodium metaaluminate,and catalyst,was determined based on the evaluation indicators of 14 d primary impermeability pressure and 28 d secondary impermeability pressure improvement rate.XRD,SEM,and EDS were used to analyze their hydration products.The research results show that the optimal combination A3B2C1D3 has a 14 day impermeability pressure of 1.38 MPa,which is 112.3%higher than the basic blank specimen;The optimal combination of A2B3C2D4 has a secondary impermeability pressure increase rate of 31.42%;XRD analysis showed that there was no new characteristic peak in the hydrated product,the content of calcium oxide was reduced,and the content of hydrated calcium silicate gel was increased;SEM and EDS analysis showed that the active substance could generate a large amount of flocculent calcium silicate hydrate gel on the surface of calcium hydroxide and in the cracks,blocking the microcracks and pores in the hydration products.The content of silicon in the hydration products increased,the content of calcium decreased,and the content of C and Al slightly increased.

关 键 词：正交试验 混凝土 活性物质 抗渗性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]