为了研究外加剂对混凝土中钢筋腐蚀的影响,模拟了混凝土孔隙液及制备了硬化水泥浆体,研究了添加不同含量的萘系减水剂对钢筋腐蚀的影响.结果表明:在模拟混凝土孔隙液中加入萘系减水剂对钢筋腐蚀有轻微的促进作用,当减水剂含量达到一定值时腐蚀增大的趋势就会消失;在硬化水泥浆体中加入萘系减水剂可以减缓钢筋的腐蚀,添加0.5%萘系减水剂阻锈效果最明显,且随着时间的延长,萘系减水剂对硬化水泥浆体中钢筋的阻锈效果增加;加入减水剂增强了硬化水泥浆体的密实性,从而减缓了钢筋的腐蚀.
Hardened cement paste and simulated concrete pore solution were prepared.The effects of naphthalene water reducer added in the simulated concrete pore solution and hardened cement paste on the corrosion behavior of reinforcing steels were studied.Results show that naphthalene water reducer can slightly accelerate the corrosion of the reinforcing steel in the simulated concrete pore solution.However,the addition of the naphthalene water reducer up to 0.5% in hardened cement paste led to decrease of the corrosion rate of the reinforcing steel,and the antirusting ability of naphthalene water reducer for the reinforcing steel increased with increasing time.The reasons may be that the introduction of naphthalene water reducer contributed to reduced amount of pores and increased the density of the hardened cement paste,hence inhibiting the corrosion of the reinforcing steel.
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