喷射沙漠砂混凝土工作和力学性能正交试验研究  

Orthogonal experimental study on working and mechanical properties of sprayed desert sand concrete

作　　者：吕世华 袁康[2,3] 李君 卢新利 郭军林 马恒[2] LÜShihua;YUAN Kang;LI Jun;LU Xinli;GUO Junlin;MA Heng(China Railway 14th Bureau Group Construction Engineering Co Ltd,Jinan,Shandong 250014,China;College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi,Xinjiang 832000,China;Xinjiang Production&Construction Groups Engineering Laboratory for Seismic and Energy-Saving Building in High Earthquake Intensity and Cold Zone,Shihezi,Xinjiang 832000,China)

机构地区：[1]中铁十四局集团建筑工程有限公司,山东济南250014 [2]石河子大学水利建筑工程学院,新疆石河子832000 [3]新疆兵团高烈度寒区建筑抗震节能技术工程实验室,新疆石河子832000

出　　处：《石河子大学学报（自然科学版）》2024年第5期583-591,共9页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(51968062);中铁十四局集团有限公司科技研发项目(913700001630559891202121)。

摘　　要：为了制备喷射沙漠砂混凝土,采用正交试验研究水胶比、砂率、粉煤灰替换率、沙漠砂替换率及单位用水量对喷射沙漠砂混凝土工作性能和力学性能影响的规律,得出其最优配合比,并构建了强度预测模型。结果表明:影响工作性能显著性的因素顺序为水胶比>沙漠砂替换率>单位用水量>砂率>粉煤灰替换率,影响28 d抗压强度显著性的因素顺序为水胶比>沙漠砂替换率>粉煤灰替换率>单位用水量>砂率,影响28 d劈裂抗拉强度显著性的因素顺序为水胶比>粉煤灰替换率>沙漠砂替换率>单位用水量>砂率。喷射沙漠砂混凝土的最优配合比为水胶比为0.43、沙漠砂替换率为30%、粉煤灰替换率为20%、砂率为50%、减水剂用量为2%、单位体积用水量为180 kg·m^(-3)。提出的喷射沙漠砂混凝土立方体抗压强度和劈裂抗拉强度预测模型精度较高。本研究可为喷射沙漠砂混凝土的应用提供参考。In order to prepare sprayed desert sand concrete,orthogonal tests were conducted to investigate the effects of water binder ratio,sand rate,fly ash replacing rate,desert sand replacing rate,and unit water consumption on the working and mechanical properties of sprayed desert sand concrete,propose the optimal mixing ratio and strength prediction model.The results show that the order of factors affecting the significance of work performance is water binder ratio,desert sand replacing rate,unit water consumption,sand rate,fly ash replacing rate,respectively.The order of factors affecting the significance of 28 d compressive strength is water cement ratio,desert sand replacing rate,fly ash replacing rate,unit water consumption sand rate,respectively.The optimal mix ratio for sprayed desert sand concrete is water-cement ratio of 0.43,desert sand replacing rate of 30%,fly ash replacing rate of 20%,sand rate of 50%,water reducer dosage of 2%,and unit water consumption 180 kg·m^(-3),respectively.The proposed model for predicting the compressive strength and splitting tensile strength of sprayed desert sand concrete has high accuracy.The research can provide a reference for the application of sprayed desert sand concrete.

关 键 词：沙漠砂 喷射混凝土 正交试验 工作和力学性能 强度预测模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]