复合工业废料-混合砂混凝土耐久性试验研究

Experimental Study on Durability of Composite Industrial Waste-Mixed Sand Concrete

摘要:

为了实现混凝土的低碳发展，采用工业废料和混合砂复合制备混凝土，并通过收缩试验、抗冻试验等研究了其耐久性能。结果表明：工业废料的掺入有效改善了混凝土的收缩性能，但是混合砂会导致混凝土早期自收缩增大；混凝土的抗碳化性能由于可碳化物质的减少和内部碱度的降低而劣化；工业废料替代水泥增强了混凝土阻碍氯离子渗透和固化氯离子的能力，但混合砂作为细骨料显著降低了混凝土的抗氯离子渗透性能；工业废料和混合砂对混凝土的抗冻性能无明显影响，其抗冻性能和普通混凝土相当。

Abstract:

In order to realize the low carbon development of concrete， industrial waste and mixed sand were utilized to prepare concrete. The durability of concrete was examined by shrinkage tests， freeze-thaw resistance tests and so on. The results indicate that the incorporation of industrial waste effectively mitigates the shrinkage of concrete. However， the use of mixed sand leads to an increase in early autogenous shrinkage. The carbonation resistance of the concrete is reduced due to a reduction in carbonization materials and a decrease in internal alkalinity. Replacing cement with industrial waste enhances the ability of concrete to resist chloride ion penetration and solidify chloride ions. Conversely， the mixed sand as a fine aggregate significantly diminishes the chloride ion penetration resistance of concrete. The industrial waste and mixed sand don’t significantly affect the freeze-thaw resistance of concrete， which is comparable to that of ordinary concrete.