为提高风积沙利用率，研究不同体积掺量的碳酸钙晶须对风积沙混凝土抗压及劈裂抗拉强度的影响规律。通过扫描电镜和核磁共振等手段，从微观角度观察碳酸钙晶须与水泥浆体的粘结形态并分析其作用机理，基于试验结果分析并提出抗压、劈裂抗拉强度与养护龄期之间的理论模型。试验结果表明：掺入适量的碳酸钙晶须能够有效的改善风积沙混凝土的孔隙结构，提高力学性能。当风积沙替换率为60%时，碳酸钙晶须对于抗压强度与劈裂抗拉强度的最佳体积掺量分别为0.15%、0.2%。提出的理论模型与试验数据吻合程度较高，可较好地预测龄期下的强度值。

In order to improve the utilization rate of aeolian sand,this article aims to study the influence of calcium carbonate whiskers with different volume content on the compressive and split tensile strength of aeolian sand concrete.Observe the bonding morphology of calcium carbonate whiskers and cement paste from a microscopic point of view through scanning electron microscopy and nuclear magnetic resonance,and analyze its mechanism of action, based on the analysis of the test results and put forward the theoretical relationship between compressive strength, split tensile strength and curing age. The test results show that adding an appropriate amount of calcium carbonate whisker can effectively improve the pore structure and mechanical properties of aeolian sand concrete. When the aeolian sand content is 60% ,The optimum volume content of calcium carbonate whisker for compressive strength and splitting tensile strength is 0.15% and 0.2% respectively. The proposed theoretical model is in good agreement with the experimental data, and can better predict the strength value under age.

TU528；S277.7 ?

内蒙古自然科学基金(2021MS05045)，内蒙古农业大学博士科研启动基金（BJ2015-2），内蒙古教育厅重点项目（NJZZ18044）