模拟工业废水对钢纤维混凝土的腐蚀试验研究

Experimental study on corrosion of steel fiber reinforced concrete under industrial wastewater environment

针对模拟工业废水环境以及工业废水-干湿循环耦合作用下钢纤维混凝土的抗压强度、抗折强度、尺寸效应等几个方面进行了试验,研究了工业废水环境下钢纤维混凝土的抗腐蚀性能.结果表明,高COD值工业废水将对钢纤维混凝土产生腐蚀劣化,钢纤维混凝土的抗压腐蚀系数和抗折腐蚀系数均随着试验龄期的增加而逐渐降低,其降低幅度随着试件尺寸的减小而增大;钢纤维对抑制混凝土抗压强度的腐蚀劣化作用不明显,但可有效抑制混凝土抗折强度的腐蚀劣化作用;在工业废水环境下经历干湿循环4个月以后,钢纤维混凝土抗压强度与抗折强度的腐蚀劣化开始显现,钢纤维的加入对混凝土抵抗工业废水干湿循环下的腐蚀能力有所提高;经历工业废水腐蚀后的小尺寸试件与标准试件之间的钢纤维混凝土抗折强度具有较为显著的尺寸效应.

The compressive strength,flexural strength and the size effect of steel fiber reinforced concrete（SFRC） were investigated under the simulation industrial wastewater environment and industrial wastewater and drying-wetting circulation coupling,and research on corrosion-resistance of SFRC was carried out.The results show that the industrial wastewater with high COD（chemical oxygen demand） value will induce corrosion of SFRC,the corrosion coefficients of compressive strength and flexural strength of SFRC decrease gradually with the increase of corroding age,and the reducing extent increase with the decrease of the specimen size.The steel fiber can not inhibit obviously the degradation of concrete compressive strength,but can inhibit effectively the degradation of concrete flexural strength.After dry-wet circulation corroding test for 4 months,the corrosion degradation of compressive strength and flexural strength of SFRC begin to appear,and the corrosion-resistance of SFRC is higher than common concrete.The size effect on flexural strength of SFRC after corroding in industrial wastewater between the small size specimen and standard size specimen is remarkable.