憎水剂与超细粉煤灰对海工混凝土抗侵蚀性能的影响研究  

Effects of Water Repellent and Ultrafine Fly Ash on Corrosion Resistance of Marine Concrete

作　　者：白鸿羽 刘翌辰 夏京亮 

机构地区：[1]中国路桥工程有限责任公司,北京100010 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《混凝土世界》2022年第5期36-40,共5页China Concrete

摘　　要：沿海地区地下水富含氯盐、硫酸盐离子,为了提高海工混凝土的抗侵蚀性能,本文研究了不同掺量超细粉煤灰(0%~30%)及不同掺量憎水剂(0%~1.5%)对海工混凝土流动性、抗压强度、抗氯离子渗透能力、吸水率的影响。结果表明,超细粉煤灰掺量20%、憎水剂掺量0.5%,对于改善混凝土抗侵蚀能力最优;超细粉煤灰能明显提高混凝土的密实度;憎水剂的掺入虽对水泥水化起到了抑制作用,但其通过对结构毛细孔疏水改性降低了混凝土吸水率。The groundwater in coastal areas is rich in chloride and sulfate ions.In order to improve the corrosion resistance of marine concrete,this paper studies different dosages of ultrafine fly ash (0%~30%) and different dosages of water repellent (0%~1.5%) on the fluidity,compressive strength,resistance to chloride ion penetration,and water absorption of marine concrete.The results show that the addition of ultrafine fly ash of 20% and the addition of water repellent of 0.5% is the best for improving the corrosion resistance of concrete.Ultrafine fly ash can significantly improve the compactness of concrete.Although the addition of water repellent can inhibit the hydration of cement,it reduces the water absorption of concrete by hydrophobic modification of structural capillary pores.

关 键 词：超细粉煤灰 憎水剂 海工混凝土 抗渗透能力 

分 类 号：TU528[建筑科学—建筑技术科学] P75[天文地球—海洋科学]