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混杂纤维增强水泥砂浆砂胶比与力学性能的关系
The Relationship Between Sand-binder Ratio and Mechanical Performance of Hydrid Fiber Reinforced Cement Mortar
2019年第8期
水泥砂浆;CaCO3晶须;河砂;砂胶比;力学性能
Cement mortar; CaCO3 whisker; River sand; Sand to mortar; Mechanical property
2019年第8期
10.19761/j.1000-4637.2019.08.045.05
国家自然科学基金项目(51678111);大连理工大学创新实验项目(2018101410301010519)。
郑宇博,杨丽辉,陈 宇,曹明莉
大连理工大学 建设工程学部,116024

郑宇博,杨丽辉,陈 宇,曹明莉

郑宇博,杨丽辉,陈宇,等.混杂纤维增强水泥砂浆砂胶比与力学性能的关系[J].混凝土与水泥制品,2019(8):45-49.

ZHENG Y B,YANG L H,CHEN Y,et al.The Relationship Between Sand-binder Ratio and Mechanical Performance of Hydrid Fiber Reinforced Cement Mortar[J].China Concrete and Cement Products,2019(8):45-49.

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摘 要:为了满足高性能、低成本的要求,试验采用质量较好的河砂作为细骨料,总共引入三种纤维,探讨了砂胶比对纤维水泥砂浆力学性能的影响及河砂与纤维混杂体系的适应性,最终确定了合适的砂胶比。试验结果表明,河砂可以使纤维混杂体系硬化物保持较高的强度,对于单掺钢纤维(SF)、钢纤维(SF)和聚乙烯醇(PVA)纤维混掺水泥砂浆,砂胶比为0.50时,硬化物的力学性能较好;三掺钢纤维、聚乙烯醇纤维、CaCO3晶须的水泥砂浆,砂胶比为0.55时能够保持较高的强度。即在引入微观纤维CaCO3后制备出的纤维增强水泥基材料(FRCC)呈现出了良好的适应性。 Abstract: In order to meet the requirements of high performance and low cost, river sand with good quality was used as fine aggregate in this test, and three types of fibers were introduced. The influence of the ratio of sand to mortar on the mechanical properties of fiber cement mortar and the adaptability of river sand and fiber hybrid system were discussed to determine the appropriate ratio of sand to mortar. The experimental results show that: the river sand can maintain high strength of hardened fiber hybrid system; for a single mixing steel fiber (SF), and double mixed steel fiber (SF) and polyvinyl alcohol (PVA) fiber cement mortar,the mechanical properties of the hardened material are better when the ratio of sand to mortar is 0.50; for three mixed steel fiber, polyvinyl alcohol fiber and CaCO3 whisker cement mortar, a high strength can be maintained when the sand to mortar ratio is 0.55. After the introduction of micro-fiber CaCO3, the prepared FRCC shows good adaptability and achieves the purpose of low cost and high performance.
英文名 : The Relationship Between Sand-binder Ratio and Mechanical Performance of Hydrid Fiber Reinforced Cement Mortar
刊期 : 2019年第8期
关键词 : 水泥砂浆;CaCO3晶须;河砂;砂胶比;力学性能
Key words : Cement mortar; CaCO3 whisker; River sand; Sand to mortar; Mechanical property
刊期 : 2019年第8期
DOI : 10.19761/j.1000-4637.2019.08.045.05
文章编号 :
基金项目 : 国家自然科学基金项目(51678111);大连理工大学创新实验项目(2018101410301010519)。
作者 : 郑宇博,杨丽辉,陈 宇,曹明莉
单位 : 大连理工大学 建设工程学部,116024

郑宇博,杨丽辉,陈 宇,曹明莉

郑宇博,杨丽辉,陈宇,等.混杂纤维增强水泥砂浆砂胶比与力学性能的关系[J].混凝土与水泥制品,2019(8):45-49.

ZHENG Y B,YANG L H,CHEN Y,et al.The Relationship Between Sand-binder Ratio and Mechanical Performance of Hydrid Fiber Reinforced Cement Mortar[J].China Concrete and Cement Products,2019(8):45-49.

摘要
参数
结论
参考文献
引用本文

摘   要:为了满足高性能、低成本的要求,试验采用质量较好的河砂作为细骨料,总共引入三种纤维,探讨了砂胶比对纤维水泥砂浆力学性能的影响及河砂与纤维混杂体系的适应性,最终确定了合适的砂胶比。试验结果表明,河砂可以使纤维混杂体系硬化物保持较高的强度,对于单掺钢纤维(SF)、钢纤维(SF)和聚乙烯醇(PVA)纤维混掺水泥砂浆,砂胶比为0.50时,硬化物的力学性能较好;三掺钢纤维、聚乙烯醇纤维、CaCO3晶须的水泥砂浆,砂胶比为0.55时能够保持较高的强度。即在引入微观纤维CaCO3后制备出的纤维增强水泥基材料(FRCC)呈现出了良好的适应性。
Abstract: In order to meet the requirements of high performance and low cost, river sand with good quality was used as fine aggregate in this test, and three types of fibers were introduced. The influence of the ratio of sand to mortar on the mechanical properties of fiber cement mortar and the adaptability of river sand and fiber hybrid system were discussed to determine the appropriate ratio of sand to mortar. The experimental results show that: the river sand can maintain high strength of hardened fiber hybrid system; for a single mixing steel fiber (SF), and double mixed steel fiber (SF) and polyvinyl alcohol (PVA) fiber cement mortar,the mechanical properties of the hardened material are better when the ratio of sand to mortar is 0.50; for three mixed steel fiber, polyvinyl alcohol fiber and CaCO3 whisker cement mortar, a high strength can be maintained when the sand to mortar ratio is 0.55. After the introduction of micro-fiber CaCO3, the prepared FRCC shows good adaptability and achieves the purpose of low cost and high performance.

关键词:
水泥砂浆;CaCO3晶须;河砂;砂胶比;力学性能
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(1)普通水泥基材料的破坏是脆性破坏,而在普通的水泥基材料中加入钢纤维后,阻碍了宏观裂缝的产生,可以极大提高水泥基材料的力学性能,加入PVA纤维和CaCO3晶须后则能有效控制混合体系细观与微观裂缝的产生,使体系强度继续增强,延性增强。
(2)钢纤维增强水泥基复合材料、PVA与钢纤维混合增强水泥基复合材料选取砂胶比0.50时,可使各材料充分利用,在得到高性能材料的同时,节省部分材料,整体适应性较好;对于三掺钢纤维、PVA纤维及CaCO3晶须纤维增强水泥砂浆,砂胶比为0.55体现出高性能。
(3)河砂是一种优质细骨料,可以使整个混合体系保持较高的强度。在混杂纤维体系中引入微观纤维CaCO3晶须后,可进一步提高拌合物的力学性能,使整个体系的协同工作性更好;CaCO3晶须的加入也优化了钢纤维与柔性PVA纤维的混杂状况,使得纤维在拌合物体系中具有更好的分散性。

[1] 张聪,曹明莉.多尺度纤维增强水泥基复合材料力学性能试验[J].复合材料学报,2014,31(3):661-668.
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[3] 赵焕起,李国忠.混杂纤维增强水泥基复合材料的力学性能[J].复合材料学报,2014,31(1):140-145.
[4] CAO M L,ZHANG C,LV H F,et al.Characterization of mechanical behavior and mechanism of calcium carbonate whisker-rein forced cement mortar [J] .Construction and Building Materials, 2014,66(1):89-97.
[5] 曹明莉,李黎,李志文,等.CaCO3晶须对钢-聚乙烯醇混杂纤维增强水泥基复合材料板弯曲性能的影响[J].复合材料学报,2017,34(11):2614-2623
[6] 曹明莉,许玲,李志文.聚乙烯醇纤维及钢纤维增强水泥砂浆流变性和流动性能[J].建筑材料学报,2017(1):112-117.
[7] CAO M L, ZHANG C, WEI J Q. Microscopic reinforcement for cement based composite materals[J]. Construction and Building Materials,2013,40(3):14-25.
[8] 邓宗才.混杂纤维增强超高性能混凝土弯曲韧性与评价方法[J].复合材料学报,2016,33(6):1274-1280.

 

郑宇博,杨丽辉,陈宇,.混杂纤维增强水泥砂浆砂胶比与力学性能的关系[J].混凝土与水泥制品,2019(8):45-49.

ZHENG Y B,YANG L H,CHEN Y,et al.The Relationship Between Sand-binder Ratio and Mechanical Performance of Hydrid Fiber Reinforced Cement Mortar[J].China Concrete and Cement Products,2019(8):45-49.

 

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