机制砂掺量对自密实轻骨料混凝土梁受弯性能的影响

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中图分类号：TU375.1；TU521.1 文献标志码：A 文章编号：2096-6717（2025）03-0142-09

Effect of manufactured sand dosage on flexural performance of self-compacting lightweight aggregate concrete beams

ZHANG Shuyun Ω1 ，LIUJianbo1，YANGXulong²，LIQiang1，BAl Miaomiao .SchoolofArchitectureandCivilEnginering，Xi’anUniversityofScienceandTechnology，Xi'an7lOo54，P.R.China; 2.Gansu Institute of Architectural Design and Research Co.，Ltd.，Lanzhou 73Oo31，P.R. China）

Abstract： In order to explore the influence of manufactured sand dosage on the flexural performance of selfcompacting lightweight aggregate concrete beams （SCLC）， five SCLC with 0% ， 30% ， 60% ， 80% and 100% （204 manufactured sand dosage for four-point bending tests.The deflection curve，mid-span deflection and crack distribution of SCLC beams with diferent 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 loaddeflection curves are basicaly 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 allriver sand. Utilising the deflection calculation formula of lightweight aggregate concrete， thedeflection 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 diferent 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% ：

Keywords： self-compacting lightweight aggregate concrete beam； manufactured sand; flexural performance; destruction form;cracking moment；flexural bearing capacity

自密实轻骨料混凝土（self-compactinglight-weightaggregateconcrete，SCLC）是一种兼具自密实混凝土与轻骨料混凝土特点的高性能混凝土，具有免振捣、质量轻的特点，能有效减少施工噪声、减轻结构自重、降低结构地震效应[1。（剩余12811字）