化学法处理水泥混凝土表面

Chemical Treatment of Cement Concrete

尽管水泥混凝土使用量最大,但氯离子是导致水泥混凝土建筑坍塌、被破坏的主要原因之一,氯离子渗透抵达混凝土内部后,从而加快了钢筋混凝土结构的腐蚀与破坏,导致混凝土的寿命降低。本文采用富含Ca^(2+)、HCO_(3)^(-)和CO_(3)^(2-)的化学助剂配置养护剂,以喷涂在混凝土表面的方式,在混凝土表面形成碳酸钙来达到提高混凝土耐久性的目的。结果表明,在碱激发矿渣溶液与不同质量浓度Mg(HCO_(3))_(2)溶液按1∶1质量比混合养护下,促使试样表面产生了碳酸钙保护层,使混凝土氯离子渗透深度降低。

The use amount of the cement concrete ranks the first in the country,but the chloride ion corrosion is one of the main problems affecting the durability of the cement concrete.The chloride ion penetrates into the concrete interior through the capillary action,thus affecting the durability of the reinforced concrete structure.The chemical additives rich in Ca^(2+),HCO_(3)^(-)and CO_(3)^(2-) are used to form calcium carbonate on the concrete surface to improve the durability of concrete.The results show that under the mixing curing of alkali excitation slag solution andMg(HCO_(3))_(2) solution at 1∶1 mass ratio,the induced carbonation of the sample surface produces a dense calcium carbonate protective layer,which reduces the penetration depth of concrete chloride ion and increases the durability of concrete.