玻璃纤维及混杂纤维高性能混凝土冻融前后力学性能对比研究

A Comparative Study of the Mechanical Properties of Freeze-thaw Action for the Glass Fiber and Hybrid Fiber High Performance Concrete

在工作度试验研究的基础上,参照国际标准研究了玻璃纤维及混杂纤维(玻璃纤维和钢纤维)对高性能混凝土强度和抗弯韧性的影响,并对比研究了快冻法冻融200次前后纤维混凝土的力学性能。结果表明,玻璃纤维及混杂纤维可有效降低高性能混凝土冻融前后抗压强度的损失;纤维尤其是钢纤维的掺入能明显提高高性能混凝土冻融前后的劈裂抗拉强度;混杂纤维或单一钢纤维的掺入可提高高性能混凝土冻融前后的弯曲韧性。

Based on the experimental study of the workability and according to the international standards, this paper analyzes the influence of the glass fiber as well as hybrid fiber （glass fiber and hybrid fiber） to the bending strength and toughness of high performance concrete. It also makes a comparative study on the mechanical properties of fiber concrete before and after 200 freeze - thaw cycles by adopting the quick freezing method. The results showed that glass fiber and hybrid fiber can effectively reduce the losses of the tensile strength of the high performance concrete before and after the freezing and thawing; the mix of fiber, especially the steel fiber can obviously enhance the splitting tensile strength of the high performance concrete before and after the freezing and thawing; incorporation of hybrid fiber or single steel fibers can increase the flexural toughness of the high performance concrete before and after the freezing and thawing.