土木与环境工程学报（中英文）2025，Vol.47Issue(3)：142-150,9.DOI:10.11835/j.issn.2096-6717.2023.068
机制砂掺量对自密实轻骨料混凝土梁受弯性能的影响
Effect of manufactured sand dosage on flexural performance of self-compacting lightweight aggregate concrete beams
摘要
Abstract
In order to explore the influence of manufactured sand dosage on the flexural performance of self-compacting lightweight aggregate concrete beams(SCLC),five SCLC with 0%,30%,60%,80%and 100%manufactured sand dosage for four-point bending tests.The deflection curve,mid-span deflection and crack distribution of SCLC beams with different manufactured sand dosages under load were studied,and the influence of manufactured sand dosage on its cracking moment and flexural capacity was explored.The results show that the average strain of each test beam section conforms to the plane section assumption,and the load-deflection curves are basically similar.With the increase of manufactured sand dosage,the SCLC beam has more secondary cracks and more uniform crack distribution.The maximum crack width decreases under the same load before yielding.The mid-span deflection and ultimate bearing capacity reach the maximum when the manufactured sand dosage was 80%,which were increased by 16.13%and 6.62%respectively compared with SCLC beams with all river sand.Utilising the deflection calculation formula of lightweight aggregate concrete,the deflection calculation value of each test beam differs from the test value.The cracking moment of the test beam was calculated using the standard formula,and the calculated value is quite different from the test value.Through the analysis of test results and calculation of flexural bearing capacity,it can be concluded that the optimal dosage of manufactured sand in SCLC is 60%-80%.关键词
自密实轻骨料混凝土梁/机制砂/受弯性能/破坏形态/开裂弯矩/受弯承载力Key words
self-compacting lightweight aggregate concrete beam/manufactured sand/flexural performance/destruction form/cracking moment/flexural bearing capacity分类
建筑与水利引用本文复制引用
张淑云,刘建波,杨旭龙,李强,白苗苗..机制砂掺量对自密实轻骨料混凝土梁受弯性能的影响[J].土木与环境工程学报（中英文）,2025,47(3):142-150,9.基金项目
国家自然科学基金(51408483) （51408483）
陕西省自然科学基金(2021-JM-392) National Natural Science Foundation of China(No.51408483) （2021-JM-392）
Natural Science Foundation of Shaanxi(No.2021-JM-392) （No.2021-JM-392）
