含膨胀剂的碾压混凝土抗硫酸盐侵蚀机理与理论模型

Mechanism and model of sulfate attack on RCC with expansive agent

通过光学显微镜和电子显微镜观察分析硫酸盐对碾压混凝土的侵蚀特征,提出三种主要侵蚀的方式,并建立理论模型。在碾压混凝土中添加适宜品种和掺量的膨胀剂,可以增加水化产物、填充浆体的毛细孔,改善混凝土的界面结构,不降低碾压混凝土的抗硫酸盐侵蚀能力。

The mechanism and model of sulfate attack on roller compacted concrete（ RCC ） with expansive agent have been proposed by investigating the microstructures of RCC with optical micrograph and SEM-EDS. It is shown that the microstructures of RCC have been improved by hydration and unhydrated products in the presence of expansive agent. Thus the density, impermeability and sulfate attack resistance may be improved slightly.