粉煤灰综合利用 2014N0.4 FLY ASH COMPREHENSIVE UTILIZATION 试验与应用 新疆沙漠细砂混凝土配合比及混凝土性能研究 Research on the Mix Performance about Xinjiang Desert Sand Concrtet 郭威，刘娟红 (北京科技大学土木与环境工程学院土木工程100083北京) 摘要：本文通过密实配合比设计技术路线，研究了新疆沙漠细砂与破碎粗砂混合后混凝土的性能，并通过孔结构 试验研究对比沙漠混合砂混凝土与破碎粗砂混凝土的孔隙率和孔隙特征.结果表明：沙漠砂与破碎粗砂按1.5：8.5比例 混合后制作出的混合砂混凝土，和易性得到改善，且各等级混凝土的28d抗压强度比破碎粗砂混凝土强度提高3MPa左 右；各等级沙漠混合砂混凝土的氯离子扩散系数均低于破碎粗砂混凝土，有效提高混凝土的抗氯离子侵蚀能力；压汞试 验表明，掺沙漠砂后，混凝土的孔隙率由15.54%降至11.25%，且平均孔径降低，孔隙得到细化，使硬化浆体的密实度 提高. 关键词：沙漠细沙；破碎粗砂；密实配合比设计；混凝土性能；孔结构 中图分类号：TU528.19文献标识码：A文章编号：1005-8249(2014)04-0028-04 Guo Wei Liu Juan-hong University of Science &Technology Beijing Civil &Environmental School Civil Engineering 100083 Beijing) Abstract:In this paper we have used the dense concrete mix designing technology to research the performance of concrete which was made by the mixing of Xinjiang desert sand and crushed sand.Then we have also pared the porpsity and pore characteristics between the mixed sand concrete and crushed sand concrete according to the pore structure experiment.The results show that:the workability of the mixed sand concrete was improved the mixed sand concrete was produced by desert sand and crushed sand according to the proportion of 1.5:8.5 and the 28d pressive strength was inereased by about 3MPa all over the different levels The chloride ion diffusion coefficient of the mixed sand concrete is lower than the crushed sand concrete in each level and the capability of resistance to the chloride ion erosion was improved:mercury test showed that after adding the desert sand the porosity of concrete decreased from 15.54%to 11.25% the average pore size was decreased the pore was refined and the mortar density was increased. Key words:Desert sand;Crushed sand;Dense concrete mix designing:Concrete properties Pore structure; 新疆地处我国西部，是我国“西部大开发”的主要人外加剂2种途径，弥补了混凝土拌合物粘稠性大、不 区域，基本建设项目工程规模大.当地沙漠面积43.4 易拌合稍微振动易产生泌水、离析、分层等问题31；王 万m2 约占新疆总面积的26%之多，而新疆混凝土领 娜等研究人员提出通过“双掺法”，即“掺用破碎粗 域中绝大部分用砂却是河砂和破碎粗砂，如果能将该 砂、掺用减水剂”，配制出沙漠砂C50高强度预应力混 ...
新疆沙漠细砂混凝土配合比及混凝土性能研究.pdf
