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| 摘要: |
| 研究了聚丙烯纤维参数对水泥砂浆干缩率的影响．结果表明：三叶形聚丙烯纤维的掺加能够减小水泥砂浆的干缩率；随着三叶形聚丙烯纤维掺量的增大，水泥砂浆干缩率呈先减小而后增大的趋势，在掺量为0．20％（体积分数）时达到最低．聚丙烯纤维长度、细度、表面改性方法及截面形状等对水泥砂浆的干缩率也都有所影响．在所研究的几种聚丙烯纤维中，聚丙烯纤维长度越大、细度越小、比表面积越大，相应水泥砂浆的干缩率越小． |
| 关键词: 纤维参数 水泥砂浆 干缩率 |
| DOI： |
| 分类号:TU528.58 |
| 基金项目: |
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| Effect of Polypropylene Fiber on Dry-shrinkage Ratio of Cement Mortar |
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LIU Li-fang WANG Pei-ming YANG Xiao-jie
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| Abstract: |
| The effect of polypropylene fiber on dry-shrinkage ratio of cement mortar was studied. The experimental results show that, polypropylene fiber mixed into cement mortar can decrease its dry-shrinkage ratio; and with increase of volume fraction of polypropylene fiber, the dry-shrinkage ratio of cement mortars are decreased firstly, and then increased, it reaches the lowest value with the fiber volume fraction of 0.20%; Polypropylene fiber length, diameter, methods of surface modification and shape of cross-section all have some effects on the dry-shrinkage ratio of cement mortar, and as for the fiber parameters discussed in this paper, the cement mortar reinforced with polypropylene fiber which are longer, finer, or have greater specific surface area, will have smaller dry-shrinkage ratio. |
| Key words: fiber parameter,cement mortar,dry-shrinkage ratio |
