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沙漠砂-粗骨料UHPC配合比设计及性能研究
Research on mix proportion design and performance of desert sand-coarse aggregate UHPC
2024年第11期
沙漠砂;粗骨料;超高性能混凝土(UHPC);配合比设计;正交试验;工作性;力学性能
Desert sand; Coarse aggregate; Ultra-high performance concrete(UHPC); Mix proportion design; Orthogonal experiment; Workability; Mechanical property
2024年第11期
10.19761/j.1000-4637.2024.11.106.05
宁夏重点研发项目(引才专项)(2022BSB03076);国家自然科学基金项目(52368025)。
马熙伦,罗 永,沙 东*,杨傲雄,唐梓轩
宁夏大学 土木与水利工程学院,宁夏 银川 750021

马熙伦,罗 永,沙 东*,杨傲雄,唐梓轩

马熙伦,罗永,沙东,等.沙漠砂-粗骨料UHPC配合比设计及性能研究[J].混凝土与水泥制品,2024(11):106-110.

MA X L,LUO Y,SHA D,et al.Research on mix proportion design and performance of desert sand- coarse aggregate UHPC[J].China Concrete and Cement Products,2024(11):106-110.

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摘   要:采用沙漠砂和粗骨料复配大掺量替代石英砂制备了超高性能混凝土(UHPC),通过正交试验研究了水胶比(0.16、0.18、0.20)、沙漠砂掺量(20%、40%、60%)、钢纤维掺量(1%、2%、3%)和粗骨料掺量(10%、20%、30%)对UHPC流动性和抗压强度的影响,并与未掺沙漠砂和粗骨料的基准组进行了对比。结果表明:沙漠砂-粗骨料UHPC的最佳配合比组合为水胶比0.16、沙漠砂掺量40%、钢纤维掺量2%、粗骨料掺量20%,此时,UHPC试件的28 d抗压强度较基准组提高了5.8%,流动度较基准组降低了10.4%,但流动度仍满足相关规范要求。 Abstract: Ultra-high performance concrete(UHPC) was prepared by replacing quartz sand with a large amount of the combination of desert sand and coarse aggregates. The effects of water-cement ratio(0.16, 0.18, 0.20), desert sand content (20%, 40%, 60%), steel fiber content(1%, 2%, 3%), and coarse aggregate content(10%, 20%, 30%) on the flowability and compressive strength of UHPC were studied through orthogonal experiments, and compared with the reference group without desert sand and coarse aggregates. The results show that the optimal mix proportion combination of desert sand-coarse aggregate UHPC is the water-cement ratio of 0.16, desert sand content of 40%, steel fiber content of 2%, and coarse aggregate content of 20%. At this time, the 28 d compressive strength of UHPC specimens increases by 5.8% compared to the reference group, and the flowability decreases by 10.4% compared to the reference group, but the flowability still meets the requirements of relevant specifications.
英文名 : Research on mix proportion design and performance of desert sand-coarse aggregate UHPC
刊期 : 2024年第11期
关键词 : 沙漠砂;粗骨料;超高性能混凝土(UHPC);配合比设计;正交试验;工作性;力学性能
Key words : Desert sand; Coarse aggregate; Ultra-high performance concrete(UHPC); Mix proportion design; Orthogonal experiment; Workability; Mechanical property
刊期 : 2024年第11期
DOI : 10.19761/j.1000-4637.2024.11.106.05
文章编号 :
基金项目 : 宁夏重点研发项目(引才专项)(2022BSB03076);国家自然科学基金项目(52368025)。
作者 : 马熙伦,罗 永,沙 东*,杨傲雄,唐梓轩
单位 : 宁夏大学 土木与水利工程学院,宁夏 银川 750021

马熙伦,罗 永,沙 东*,杨傲雄,唐梓轩

马熙伦,罗永,沙东,等.沙漠砂-粗骨料UHPC配合比设计及性能研究[J].混凝土与水泥制品,2024(11):106-110.

MA X L,LUO Y,SHA D,et al.Research on mix proportion design and performance of desert sand- coarse aggregate UHPC[J].China Concrete and Cement Products,2024(11):106-110.

摘要
参数
结论
参考文献
引用本文

摘   要:采用沙漠砂和粗骨料复配大掺量替代石英砂制备了超高性能混凝土(UHPC),通过正交试验研究了水胶比(0.16、0.18、0.20)、沙漠砂掺量(20%、40%、60%)、钢纤维掺量(1%、2%、3%)和粗骨料掺量(10%、20%、30%)对UHPC流动性和抗压强度的影响,并与未掺沙漠砂和粗骨料的基准组进行了对比。结果表明:沙漠砂-粗骨料UHPC的最佳配合比组合为水胶比0.16、沙漠砂掺量40%、钢纤维掺量2%、粗骨料掺量20%,此时,UHPC试件的28 d抗压强度较基准组提高了5.8%,流动度较基准组降低了10.4%,但流动度仍满足相关规范要求。

Abstract: Ultra-high performance concrete(UHPC) was prepared by replacing quartz sand with a large amount of the combination of desert sand and coarse aggregates. The effects of water-cement ratio(0.16, 0.18, 0.20), desert sand content (20%, 40%, 60%), steel fiber content(1%, 2%, 3%), and coarse aggregate content(10%, 20%, 30%) on the flowability and compressive strength of UHPC were studied through orthogonal experiments, and compared with the reference group without desert sand and coarse aggregates. The results show that the optimal mix proportion combination of desert sand-coarse aggregate UHPC is the water-cement ratio of 0.16, desert sand content of 40%, steel fiber content of 2%, and coarse aggregate content of 20%. At this time, the 28 d compressive strength of UHPC specimens increases by 5.8% compared to the reference group, and the flowability decreases by 10.4% compared to the reference group, but the flowability still meets the requirements of relevant specifications.

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(1)采用连续级配理论设计的沙漠砂-粗骨料UHPC的骨料理论配比为:沙漠砂掺量36%、碎石掺量22%,此时,骨料体系能达到最紧密堆积状态。
(2)各因素对UHPC流动度影响程度的大小顺序为:水胶比A>钢纤维掺量C>沙漠砂掺量B>碎石掺量D,最佳组合为A3B2C1D1,即水胶比0.20、沙漠砂掺量40%、钢纤维掺量1%、碎石掺量10%。
(3)各因素对UHPC各龄期抗压强度影响程度的大小顺序均为:水胶比A>钢纤维掺量C>沙漠砂掺量B>碎石掺量D,最佳组合均为A1B2C2D2,即水胶比0.16、沙漠砂掺量40%、钢纤维掺量2%、碎石掺量20%。
(4)综合考虑流动度和各龄期抗压强度, 本文确定UHPC的最佳配合比组合为A1B2C2D2,即水胶比0.16、沙漠砂掺量40%、钢纤维掺量2%、碎石掺量20%。此时,UHPC的流动性和抗压强度均较好,且骨料配比与根据连续级配理论得到的骨料理论配比相近,说明采用连续级配理论设计沙漠砂-粗骨料UHPC是可行的。

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马熙伦,罗永,沙东,.沙漠砂-粗骨料UHPC配合比设计及性能研究[J].混凝土与水泥制品,2024(11):106-110.

MA X L,LUO Y,SHA D,et al.Research on mix proportion design and performance of desert sand- coarse aggregate UHPC[J].China Concrete and Cement Products,2024(11):106-110.

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