PVA纤维水泥基复合材料单面盐冻性能及损伤

发布时间：2018-04-06 21:33

本文选题：PVA纤维　切入点：水泥基复合材料　出处：《土木工程与管理学报》2017年02期

【摘要】：单面盐冻环境下PVA纤维水泥基复合材料的冻融破坏反映了路面、桥面由于除冰盐造成破坏的工程实际情况。本文通过单面盐冻试验研究PVA纤维掺量、水胶比、粉煤灰掺量对水泥基复合材料抗冻性能的影响,试验结果表明,纤维掺量在0~2%之间时制备的PVA纤维水泥基复合材料,随着纤维掺量的增加抗冻性能增强;水胶比在0.27~0.4之间时制备的PVA纤维水泥基复合材料,随着水胶比的增大抗冻性能减弱;粉煤灰掺量在45%~50%之间时,PVA纤维水泥基复合材料表现出良好的抗冻性能。并用二参数Weibull分布模型分析了PVA纤维水泥基复合材料的冻融损伤,建立了考虑纤维掺量、水胶比、粉煤灰掺量三因素的冻融损伤模型,模型计算值与试验值吻合良好,表明本文建议的模型可用于PVA纤维水泥基复合材料冻融损伤分析,为进一步研究其冻融损伤规律提供参考。
[Abstract]:The freeze-thaw failure of PVA fiber cement matrix composites under the condition of single side salt freezing reflects the actual engineering situation of the pavement and bridge deck damage caused by deicing salt.In this paper, the effects of PVA fiber content, water / binder ratio and fly ash content on the freezing resistance of cement matrix composites were studied by single side salt freezing test. The results showed that the PVA fiber cement matrix composites were prepared when the fiber content was between 0% and 2%.With the increase of fiber content, the freezing resistance of PVA fiber cement composites increased with the increase of water / binder ratio, and the freezing resistance of PVA fiber cement composites decreased with the increase of water / binder ratio.When the fly ash content is between 45% and 50%, PVA fiber cement matrix composites show good frost resistance.The freeze-thaw damage of PVA fiber cement matrix composites was analyzed by using a two-parameter Weibull distribution model. A freeze-thaw damage model with three factors including fiber content, water / binder ratio and fly ash content was established. The calculated values of the model were in good agreement with the experimental values.The results show that the model proposed in this paper can be applied to the freeze-thaw damage analysis of PVA fiber cement matrix composites and provide a reference for further study on the freeze-thaw damage law.
【作者单位】：河北工业大学土木与交通学院;天津市赛英工程技术咨询有限公司;
【基金】：国家自然科学基金(51578208) 河北省自然科学基金(E2014202178)
【分类号】：TU528

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