复合活性剂+聚酯纤维对混凝土抗裂性能的影响
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摘要
通过平板诱导开裂试验与非接触早龄期收缩试验,探讨了不同配方复合活性剂+聚酯纤维对无掺和料混凝土抗裂收缩性能的影响,并就机理简要分析。研究表明:基于浆体初期特殊界面结合效应、水化反应调节机制及均布纤维增强约束作用,相同混凝土配合比、不同配方复合活性剂+聚酯纤维组分掺量下,试样裂缝开裂面积减少率及收缩降低率效果较显著;混凝土早期收缩抗裂性能取决于复合粉剂组分中重质钙粉/氧化活性剂的合理比例;此外,优选配方掺量混凝土的工作性如坍损、含气量及压力泌水率等也得到有效改善,可施工性良好。
The effects of different formulations of active agent add polyester fiber on the shrinkage resistance of ordinary concrete were discussed by means of plate induced cracking test and non-contact early age contraction test. The mechanism was briefly analyzed. The results show that, based on the special interfacial bonding effect of the slurry, the hydration reaction regulation mechanism and the uniform fiber reinforced binding effect, under the same concrete ratio of different formulations of active agent add polyester fiber composition, the sample crack cracking area reduction rate and shrinkage reduction rate are significant. Inhibition of early shrinkage cracking effect of concrete has a positive correlation with heavy calcium powder/oxidative-active agent in active agent component. In addition, it is preferable that the concrete workability(such as collapse, gas content and pressure bleeding rate of the formulation content) is also improved.
The effects of different formulations of active agent add polyester fiber on the shrinkage resistance of ordinary concrete were discussed by means of plate induced cracking test and non-contact early age contraction test. The mechanism was briefly analyzed. The results show that, based on the special interfacial bonding effect of the slurry, the hydration reaction regulation mechanism and the uniform fiber reinforced binding effect, under the same concrete ratio of different formulations of active agent add polyester fiber composition, the sample crack cracking area reduction rate and shrinkage reduction rate are significant. Inhibition of early shrinkage cracking effect of concrete has a positive correlation with heavy calcium powder/oxidative-active agent in active agent component. In addition, it is preferable that the concrete workability(such as collapse, gas content and pressure bleeding rate of the formulation content) is also improved.
引文
[1] WEN Ziyun, YANG Yibo. Influence of chemical and mineral admixture of shrinkage and cracking of mortar guide on cracking controlling of reinforced concrete structure [M]. Beijing: Chemical Industry Press, 2004.
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[4] 郝娟, 余红发,白康,等. 混杂纤维对大掺量矿物掺合料混凝土干燥收缩的影响[J].材料科学与工程学报,2008,26(4):574-578.
[5] 李为民, 许金余. 玄武岩纤维对混凝土的增强和增韧效应[J].硅酸盐学报,2008,36(4):476-481.
[6] 范小春, 陈允伟, 胡宜昌. 无机聚合物橡胶混凝土基本力学性能试验研究[J].硅酸盐通报,2016(9):2701-2709.
[7] 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(5):33-35.
[8] 高慧婷, 张亮, 张颖. 微硅粉和聚丙烯纤维对混凝土抗裂性研究[J].吉林建筑工程学院学报,2011(2):69-71.
[9] 钱晓倩, 詹树林. 减水剂对混凝土收缩和裂缝的负影响[J].铁道科学与工程学报,2004(2):19-25.
[10] LEPAGE S, BALBAKI M, DALLAIRE E. Early shrinkage development in the high performance concrete [J]. Cement, concrete and aggregates, 1999(2):31-35.
[2] PARVIZ S. Secondary reinforced-adding cellulose fibers [J]. Concrete international, 1997(6):28-34.
[3] 刘数华, 何林. 聚丙烯纤维混凝土抗裂性的试验研究[J].化学建材,2005,21(2):50-52.
[4] 郝娟, 余红发,白康,等. 混杂纤维对大掺量矿物掺合料混凝土干燥收缩的影响[J].材料科学与工程学报,2008,26(4):574-578.
[5] 李为民, 许金余. 玄武岩纤维对混凝土的增强和增韧效应[J].硅酸盐学报,2008,36(4):476-481.
[6] 范小春, 陈允伟, 胡宜昌. 无机聚合物橡胶混凝土基本力学性能试验研究[J].硅酸盐通报,2016(9):2701-2709.
[7] 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(5):33-35.
[8] 高慧婷, 张亮, 张颖. 微硅粉和聚丙烯纤维对混凝土抗裂性研究[J].吉林建筑工程学院学报,2011(2):69-71.
[9] 钱晓倩, 詹树林. 减水剂对混凝土收缩和裂缝的负影响[J].铁道科学与工程学报,2004(2):19-25.
[10] LEPAGE S, BALBAKI M, DALLAIRE E. Early shrinkage development in the high performance concrete [J]. Cement, concrete and aggregates, 1999(2):31-35.