聚丙烯纤维和钢纤维对自密实混凝土性能及裂缝修复的影响

Influence of Polypropylene and Steel Fibers on the Performance and Crack Repair of Self-Compacting Concrete.

作者信息

Abed Mohammed A, Fořt Jan, Naoulo Abdulkarim, Essa Amr

机构信息

Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.

Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, 16629 Prague, Czech Republic.

出版信息

Materials (Basel). 2021 Sep 24;14(19):5506. doi: 10.3390/ma14195506.

DOI:10.3390/ma14195506

PMID:34639919

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8509466/

Abstract

The research reported in this paper aims to evaluate the epoxy injection technique used to strengthen fiber-reinforced self-compacting concrete (FRSCC) with high strength. This method is carried out on ruptured concrete specimens to assess the efficiency of the epoxy resin adhesive injection retrofitting technique for strength and stiffness. Five FRSCC mixes were designed and placed using different types (steel and polypropylene) and contents (0%, 0.25%, and 0.45% by volume) of fibers. The fresh and mechanical properties in addition to the microstructure of produced mixes were evaluated to assess the impact of fibers on the behavior of FRSCC. Results showed that the workability of FRSCC is reduced by increasing steel or polypropylene fiber content; however, the rheological characteristics of placed mixes satisfied the European Guidelines for Self-Compacting Concrete recommendation for fresh concrete. Also, splitting tensile, flexural, and shear strengths were enhanced by increasing fiber content. The simultaneous application of epoxy injection in FRSCC for repairing damaged concrete beams was shown to be highly effective.

摘要

本文报道的研究旨在评估用于增强高强度纤维增强自密实混凝土（FRSCC）的环氧树脂注入技术。该方法在破裂的混凝土试件上进行，以评估环氧树脂胶粘剂注入修复技术对强度和刚度的有效性。设计并浇筑了五种FRSCC混合料，使用了不同类型（钢纤维和聚丙烯纤维）和含量（按体积计0%、0.25%和0.45%）的纤维。除了对所制备混合料的微观结构进行评估外，还对其新拌性能和力学性能进行了评估，以评估纤维对FRSCC性能的影响。结果表明，增加钢纤维或聚丙烯纤维含量会降低FRSCC的工作性；然而，浇筑混合料的流变特性满足欧洲自密实混凝土指南对新拌混凝土的建议。此外，增加纤维含量可提高劈裂抗拉强度、抗弯强度和抗剪强度。结果表明，在FRSCC中同时应用环氧树脂注入修复受损混凝土梁非常有效。