文献类型：期刊文献

中文题名：沙漠砂对混凝土徐变的影响

英文题名：Influence of Desert Sand on Creep of Concrete

作者：邱成江[1,2];赵勇[3,4];何智海[5]

机构：[1]滇西应用技术大学建筑工程学院,大理671000;[2]滇西应用技术大学建筑材料检测技术工程研究中心,大理671000;[3]云南省建筑科学研究院有限公司,昆明650223;[4]云南省建筑结构与新材料企业重点实验室,昆明650223;[5]绍兴文理学院土木工程学院,绍兴312000

年份：2024

卷号：43

期号：12

起止页码：4417

中文期刊名：硅酸盐通报

外文期刊名：Bulletin of the Chinese Ceramic Society

收录：北大核心2023、CSTPCD、、Scopus、北大核心

基金：国家自然科学基金(51602198);滇西应用技术大学项目(2021KYPT0004)。

语种：中文

中文关键词：沙漠砂;混凝土;徐变;力学性能;孔结构;微观结构

外文关键词：desert sand;concrete;creep;mechanical property;pore structure;microstructure

中文摘要：为进一步推动沙漠砂混凝土的应用,采用预应力加载方式研究了沙漠砂取代不同掺量(25%、50%和75%,质量分数)河砂对混凝土徐变的影响,结合孔结构和微观形貌分析了影响机理。结果表明,当沙漠砂取代25%河砂时,混凝土抗压强度和弹性模量增加,28 d抗压强度和弹性模量分别增加了7.5%和3.6%,混凝土徐变降低,180 d徐变应变降低了31.7%,180 d徐变度降低了35.7%,180 d徐变系数降低了32.1%,继续增加沙漠砂取代率,混凝土强度和弹性模量降低,徐变增加。沙漠砂取代河砂时,与徐变相关的孔径小于50 nm的孔隙率增加;沙漠砂取代25%河砂时,与强度相关的大于50 nm的孔径孔隙率降低,混凝土内部结构变得密实,进一步增加沙漠砂取代率,混凝土内部结构变得疏松。

外文摘要：In order to further promote the application of desert sand concrete,the influence of desert sand replacing river sand with different content(25%,50%and 75%,mass fraction)on the creep of concrete was studied by prestressed loading method,and the influence mechanism was analyzed in the combination with pore structure and microscopic morphology.The results show that the desert sand replacing 25%river sand increases the compressive strength and elastic modulus of concrete,which increase by 7.5%and 3.6%at 28 d,respectively,and reduces creep of concrete.The creep strain of concrete at 180 d is reduced by 31.7%,the specific creep at 180 d is reduced by 35.7%and the creep coefficient at 180 d is reduced by 32.1%.With the further increase of the replacement rate of desert sand,the compressive strength and elastic modulus of concrete are reduced,and the creep of concrete is improved.The desert sand replacing river sand increases the porosity with pore diameter less than 50 nm which is associated with the creep.The desert sand replacing 25%river sand reduces the porosity with pore diameter greater than 50 nm of concrete which is associated with the strength,and the internal structure of concrete is improved.With the further increase of the replacement rate of desert sand,the internal structure of concrete is loosened.