超高抗折钢纤维混凝土配制及工程应用

关键字：超高,抗折,钢纤维,混凝土,配制,工程,应用

（四川华西绿舍建材有限公司，四川 成都  610051）
 

    摘要：结合工程实例，采用特制钢纤维、高性能复合掺合料等原材料进行配合比设计，通过混凝土配合比正交试验，以混凝土施工性能和力学性能作为评价指标，优化了砂率、水胶比、胶凝材料用量、钢纤维掺量等影响因素。试验结果和工程应用表明，特制钢纤维能显著提高混凝土的抗折强度，高性能复合掺合料能改善拌合物的粘聚性，按照砂率为41%，水胶比为0.30，钢纤维体积掺量为2.5%，胶凝材料用量为630 kg/m3的配合比，能够配制出抗折强度达到20 MPa的超高抗折钢纤维混凝土。
    关键词：超高抗折；泵送混凝土；高性能复合掺合料
    中图分类号：TU528.572        文献标识码：A        文章编号：1001702X（2017）09-0005-04

Preparation and application of super high flexural strength steel fiber reinforced concrete
WU Xin，GUI Gensheng，LIU Dengxian
（Sichuan Huashi Green Homeland Building Materials Co. Ltd.，Chengdu 610051，China）

    Abstract：Based on the engineering application, by use of special steel fiber，high performance composite admixture of raw materials for the mix design of concrete mix，and the construction properties and the mechanical properties of concrete are used as the evaluation index by means of orthogonal test，the influence factors of sand ratio，water cement ratio，the amount of cementitious material，steel fiber content are optimized. The experimental results and engineering application show that special steel fiber can significantly improve the flexural strength，and the high performance composite admixture can improve the mixture cohesion. The sand ratio is 41%，the water cement ratio is 0.30，the steel fiber volume fraction is 2.5%，the amount of cementitious materials is 630 kg/m3，such mix can prepare ultra high flexural strength of steel fiber reinforced concrete with flexural strength of 20 MPa.
    Key words：super high flexural strength，pumping concrete，high performance composite admixture