機制砂摻量對自密實輕骨料混凝土梁受彎性能的影響

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中圖分類號：TU375.1；TU521.1 文獻標志碼：A 文章編號：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

自密實輕骨料混凝土（self-compactinglight-weightaggregateconcrete，SCLC）是一種兼具自密實混凝土與輕骨料混凝土特點的高性能混凝土，具有免振搗、質量輕的特點，能有效減少施工噪聲、減輕結構自重、降低結構地震效應[1。（剩余12811字）