生态钢纤维活性粉末混凝土力学特性试验与分析

发布时间：2018-06-02 12:00

本文选题：活性粉末混凝土 + 生态钢纤维　；参考：《中国科技论文》2017年13期

【摘要】：为改变钢纤维价格对活性粉末混凝土推广的制约,提高废旧资源再生利用价值,探究生态钢纤维用于增强活性粉末混凝土的可行性,对生态钢纤维和原生钢纤维增强活性粉末混凝土的强度、无切口梁4点弯曲韧性和切口梁3点弯曲断裂特性进行了试验研究。结果表明:生态钢纤维体积掺率从0%增加到1.2%、1.8%、2.4%、3.0%时,立方体抗压强度、劈裂抗拉强度不断提高;生态钢纤维掺率2.4%~3.0%时,试件残余强度得到显著提高,韧性指标值达到理想弹塑性材料水平,断裂韧度是素活性粉末混凝土的7~10倍,韧性和抗断裂性能得到显著改善。同原生钢纤维增强活性混凝土性能相比,适宜掺率的生态钢纤维对活性粉末混凝土能够发挥较好的增强、增韧、抗裂作用,生态钢纤维可以替代部分或者全部的原生钢纤维达到相近的增强增韧效果。
[Abstract]:In order to change the restriction of steel fiber price on the popularization of reactive powder concrete and to improve the value of recycling waste resources, the feasibility of using ecological steel fiber to strengthen reactive powder concrete was explored. The strength of Eco-steel fiber and primary steel fiber reinforced reactive powder concrete, the four-point bending toughness of no-notch beam and the three-point bending fracture characteristic of notch beam were studied experimentally. The results showed that the volume ratio of ecological steel fiber increased from 0% to 1.2% and 1.8% and 2.4%, and the cube compressive strength and splitting tensile strength increased continuously at 3.0%, and the residual strength of the specimen increased significantly when the ratio of ecological steel fiber was 2.4 ~ 3.0. The toughness index value reaches the ideal elastic-plastic material level, the fracture toughness is 710 times than that of the plain reactive powder concrete, and the toughness and the fracture resistance property are improved obviously. Compared with the properties of primary steel fiber reinforced active concrete, ecological steel fiber with suitable blending ratio can play a better role in strengthening, toughening and cracking resistance of reactive powder concrete. Eco-steel fiber can replace some or all of the primary steel fibers to achieve similar reinforcing and toughening effect.
【作者单位】：北京工业大学城市与重大工程安全减灾省部共建重点实验室;玉田县致泰钢纤维制造有限公司;
【基金】：高等学校博士学科点专项科研基金资助项目(20131103110017)
【分类号】：TU528

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