CF密实剂对硫酸盐侵蚀下普通混凝土孔隙结构影响机制的研究  

Study on the Mechanism of the Effect of CF Densifiers on the Pore Structure of Ordinary Concrete Under Sulphate Erosion

作　　者：陈碧辉 邓锐 管滇 刘卓[2,3] 郭荣鑫 CHEN Bihui;DENG Rui;GUAN Dian;LIU Zhuo;GUO Rongxin(Blue Shield(Yunnan)Engineering Technology Co.,Ltd.,Kunming 650500,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China)

机构地区：[1]蓝盾(云南)工程技术有限公司,昆明650500 [2]昆明理工大学建筑工程学院,昆明650500 [3]云南省土木工程防灾重点实验室,昆明650500

出　　处：《材料导报》2024年第S02期202-207,共6页Materials Reports

摘　　要：近年来,混凝土在硫酸盐侵蚀环境中的耐久性问题逐渐受到重视,而优化混凝土的孔隙结构是提升其耐久性的关键途径。为了增强混凝土在硫酸盐环境下的服役性能,研究密实剂对混凝土微观孔隙结构的影响机制具有重要意义。本研究针对普通混凝土,采用两种商业密实剂(CF-S2和CF-S5)对其孔隙结构进行优化,通过X射线衍射(XRD)和X射线断层扫描(X-CT)技术分析了28 d龄期净浆的水化产物及混凝土的微观孔隙结构。结果表明,CF密实剂能够促进水泥水化,生成更多的钙矾石,并有效细化混凝土基体的孔径,减少孔径大小的差异性,增加小孔数量,抑制连通孔隙的形成。CF密实剂对混凝土微观孔隙结构的改善,显著提升了其在硫酸盐环境下的耐久性,具有重要的工程应用价值。本研究结果可为CF密实剂在混凝土中的应用提供重要的理论支撑。In recent years,the durability of concrete in sulfate environments has gained increasing attention,with optimizing the pore structure being a crucial approach to enhancing its longevity.To improve the performance of concrete under sulfate conditions,it is essential to examine the impact of densifiers on its micro-pore structure.This study focuses on optimizing the pore structure of ordinary concrete using two commercial densifiers(CF-S2 and CF-S5).Using X-ray diffraction(XRD)and X-ray computed tomography(X-CT),the hydration products of 28-day-old cement paste and the micro-pore structure of the concrete were analyzed.The results show that CF densifiers promote cement hydration,leading to increased formation of ettringite.Additionally,the CF densifiers effectively refine the concrete matrix by reducing pore size variability,increasing the number of small pores,and inhibiting the formation of connected pores.These improvements in the micro-pore structure significantly enhance the durability of concrete in sulfate environments,making the findings valuable for practical engineering applications.This study provides important theoretical support for the application of CF densifiers in concrete.

关 键 词：密实剂 混凝土 硫酸盐侵蚀 X射线断层扫描 孔隙结构 

分 类 号：TU528.33[建筑科学—建筑技术科学]