通过测定混凝土的长期干燥收缩值,研究了单掺聚丙烯(polypropylene,PP)纤维、聚酯纤维和钢纤维及其混杂技巧对大掺量矿物掺合料混凝土干燥收缩的影响.结果表明,大掺量矿物掺合料混凝土的干燥收缩比较大,纤维及混杂技巧有利于降低其干燥收缩,纤维的弹性模量越高,其抑制干燥收缩的效果越好;(0.05%PP纤维+0.05%聚酯纤维)的有机纤维混杂效果优于(0.1%PP纤维+0.7%钢纤维)和(0.1%聚酯纤维+0.7%钢纤维)的有机与无机纤维混杂;混杂纤维对混凝土干燥收缩的抑制效果与纤维之间的搭配有关.综合分析表明,(PP纤维+聚酯纤维)的二元混杂技术具有良好的工程应用价值.
参考文献
| [1] | Abiola T O .Plastic shrinkage cracking of blended cement concretes under hot weather conditions[D].King Fahd University of Petroleum & Minerals,2002. |
| [2] | G. Appa Rao .Long-term drying shrinkage of mortar - influence of silica fume and size of fine aggregate[J].Cement and Concrete Research,2001(2):171-175. |
| [3] | B. Barr;S. B. Hoseinian;M. A. Beygi .Shrinkage of concrete stored in natural environments[J].Cement & concrete composites,2003(1):19-29. |
| [4] | Paillere A M .Effect of fiber addition on the autogenous shrinkage of silica fume concrete[J].ACI MATERIALS JOURNAL,1989,86(02):139-144. |
| [5] | 李丽,孙伟,刘志勇.用平板法研究高性能混凝土早期塑性收缩开裂[J].混凝土,2003(12):33-36. |
| [6] | Balaguru P N;Shah S P.Fiber reinforced cement composites[M].New York:McGraw-Hill,1992:367-368. |
| [7] | 黄源江,张宝兰,方晖.掺聚丙烯纤维控制混凝土塑性收缩裂缝的研究[J].水运工程,2000(11):1-3. |
| [8] | 孙伟,钱红萍,陈惠苏.纤维混杂及其与膨胀剂复合对水泥基材料的物理性能的影响[J].硅酸盐学报,2000(02):95-99,104. |
| [9] | Wei Sun;Huisu Chen;Xin Luo .The effect of hybrid fibers and expansive agent on the shrinkage and permeability of high-performance concrete[J].Cement and Concrete Research,2001(4):595-601. |
| [10] | 耿飞,钱春香,樊建平.纤维和膨胀剂对混凝土收缩性能的影响[J].混凝土与水泥制品,2003(05):33-35. |
| [11] | Tazawa E;Miyazawa S .Influence of cement and admixture on autogenous shrinkage of cement paste[J].Cement and Concrete Research,1995,25(02):281-287. |
| [12] | Igarashi S;Kubo H R;Kawamura M .Long-term volume changes and microcraeks formation in high strength mortars[J].Cement and Concrete Research,2000,30(06):943-951. |
| [13] | 黄士元;蒋家奋;杨南如.近代混凝土技术[M].西安:陕西科学技术出版社,1998 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%