纳米SiO_(2)改性聚合物水泥基复合材料孔隙结构演变特征及强度预测  

Pore Structure Evolution Characteristics and Strength Prediction of Polymer Cement-based Composites Modified by Nano-SiO_(2)

作　　者：李刊 魏智强 路承功 蒲育 LI Kan;WEI Zhiqiang;LU Chenggong;PU Yu(School of Civil Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering and Transportation,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]兰州工业学院土木工程学院,兰州730050 [2]兰州理工大学土木工程学院,兰州730050 [3]广州大学土木与交通工程学院,广州510006

出　　处：《材料导报》2025年第6期72-81,共10页Materials Reports

基　　金：甘肃省高校青年博士支持项目(2024QB-105)。

摘　　要：为提高聚合物水泥基材料的水化速率,利用纳米SiO_(2)对其进行改性,成功制备出纳米SiO_(2)改性聚合物水泥基复合材料。为进一步明确复合材料强度与不同尺度孔隙结构之间的关系,首先探究了纳米SiO_(2)对聚合物水泥砂浆水化进程、抗压强度、孔隙结构特征参数、孔隙量及孔径分布的影响规律,然后重点探讨了抗压强度与孔径分布和孔隙量参数之间的关系,最后采用多元回归分析法,建立了抗压强度与孔径分布和孔隙量两类孔隙参数之间的定量关系模型。结果表明:纳米SiO_(2)改性聚合物水泥砂浆试件在早期及后期强度均高于聚合物水泥砂浆基准试件,且平均孔径、中值孔径降低,最可几孔径变小,大孔和毛细孔比例大幅降低,过渡孔比例增加,凝胶孔比例变化较小,改性砂浆的孔隙结构得到极大细化。通过回归分析可知,对孔径分布参数来说,平均孔径与抗压强度的相关性最高;对孔隙量参数来说,毛细孔孔隙量与抗压强度的相关性最高,且考虑孔径分布和孔隙量两方面的孔隙结构预测模型可以准确地预测纳米SiO_(2)改性聚合物水泥基复合材料的强度。In order to improve the hydration rate of polymer cement-based materials,nano-SiO_(2) was added to prepare polymer cement-based compo-sites modified by nano-SiO_(2).For the sake of clarifying the relationship between the strength and the porous structure of different-scale pores,the effects of nano-SiO_(2) on the hydration process,compressive strength,pore structure characteristic parameters,pore volume and pore diameter distribution of polymer cement mortar were firstly investigated.Secondly,the relationship between compressive strength and pore diameter distribution and pore volume parameters were further discussed.Finally,multiple regression analysis was used to establish a quantitative rela-tionship model between compressive strength and pore diameter distribution and pore volume.The results show that the strength of polymer cement mortar modified by nano-SiO_(2) specimens is higher than that of polymer cement mortar specimens in the early and late stages.In addition,the average pore diameter and medium pore diameter are reduced,and the most probable pore diameter is reduced,the proportion of macro-pores and capillary pores is greatly reduced,the proportion of transition pores is increased,and the proportion of gel pores is not changed much,so that the pore structure of modified mortar is greatly refined.According to the regression analysis,for the pore diameter distribution parameters,the correlation between the average pore diameter and compressive strength is the highest.The pore structure prediction model considering both pore diameter distribution and pore volume can accurately predict the strength of polymer cement-based composites modified by nano-SiO_(2).

关 键 词：纳米二氧化硅 孔隙结构 聚合物水泥基材料 多元回归 预测模型 

分 类 号：TU528[建筑科学—建筑技术科学]