静载下腐蚀后钢纤维混凝土粘结性能试验研究

Experimental study on the bonding properties of steel fiber concrete under static loading corrosion

针对钢纤维混凝土在腐蚀后的粘结强度进行系统的试验研究,制作了9组梁式粘结试件,以混凝土强度、钢纤维体积率和钢筋锈蚀率作为影响因素,按照设计的试验,对部分试件进行电化学腐蚀后,通过静力加载试验,分别测得了各种情况下的极限荷载和粘结滑移量,对试验结果进行了研究和分析.结果表明:掺有钢纤维的试件粘结强度高,极限荷载随钢纤维体积率的增大而增大,对滑移量影响也很大;有锈蚀影响的情况下,锈蚀率对极限荷载和粘结强度有很大的影响,相同锈蚀情况下,有钢纤维的试件粘结强度要大些;钢纤维的加入,对提高试件的抗腐蚀性能和粘结强度是十分有效的.

Experimental study on the bond strength of steel fiber reinforced concrete after corrosion has been conducted systematically. Nine groups of beam type specimens were fabricated. According to trial design, after electrochemical corrosion, parts of the specimens were loaded by static adhesion test, with concrete strength, steel fiber volume ratio and the rebar corrosion rate as factors. The ultimate load and slip under a variety of circumstances were measured, and the test results were studied and analyzed. The results showed that： high steel fibers doped specimen bond strength, ultimate load with increasing fiber volume ratio increases, the impact on the amount of slip is also great; under influence of corrosion, the corrosion rate of the ultimate load and adhesive strength has a great impact, under the same corrosion conditions, the steel fiber specimen and the adhesive strength will be bigger; the adding of steel fiber will improve the corrosion resistance and the adhesive strength of the specimen.