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.
Abstract
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.
基金项目
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)
维普
万方数据