(内蒙古科技大学土木工程学院， 包头 014010)

［摘要］通过风积沙等质量取代普通河砂制备风积沙混凝土（ASC），对其开展抗压强度试验研究，并借助扫描电镜（SEM）和核磁共振（NMR）分析ASC内部微观形貌和孔结构特征。结果表明：抗压强度随着风积沙替代率的增加呈先增大后减小的趋势，风积沙替代率为20%时，抗压强度最大。ASC的T2谱分布主要表现为3~4个峰，风积沙掺入使硬化后混凝土的大孔向小孔发展。抗压强度与胶凝孔所占比成正相关关系，与孔隙率成反比例关系，而与毛细孔和非毛细孔所占比并未表现出显著的关系。最后，建立了ASC抗压强度与孔结构特征参数（孔隙率和孔径分布）之间的函数模型，该模型具有较好的拟合精度。 

［关键词］风积沙混凝土；微观结构；抗压强度；扫描电镜；孔结构；函数模型 

中图分类号：TU528 文献标识码：A文章编号：1002-848X(2021)16-0135-05

 Study on microstructure and pore characteristics of aeolian sand concrete 

YIN  Yingzi,  LEI  Yanan,  SU  Ying 

(School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010， China) 

Abstract: Aeolian sand concrete (ASC) was prepared by replacing ordinary river sand with aeolian sand of equal mass, and the compressive strength test of ASC was carried out, the microstructure and pore structure of ASC were analyzed by scanning electron microscope (SEM) and nuclear magnetic resonance (NMR). The results show that the compressive strength increases first and then decreases with the increase of the replacement rate of aeolian sand. When the replacement rate of aeolian sand is 20%, the compressive strength is the largest. The T2 spectral distribution of ASC is mainly shown as 3~4 peaks. The addition of aeolian sand made the large holes of hardened concrete develop into small holes. The compressive strength is positively correlated with the proportion of cementitious pores and inversely correlated with the porosity, but not significantly correlated with the proportion of capillary and non-capillary pores. Finally, a functional model between ASC compressive strength and pore structure characteristic parameters (porosity and pore size distribution) was established, which had a good fitting accuracy. 

Keywords:aeolian sand concrete； microstructure； compressive strength； scanning electron microscope； pore structure； function model

*内蒙古自治区自然科学(2013MS0717,2017MS(LH)0523)，内蒙古研究生科研创新项目（S2018112030Z）。

 作者简介：银英姿，教授，硕士生导师，Email:811489571@qq.com。