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日本最近开发了一种耐久性高达500年的“超高耐久性混凝土”,用它浇注的钢筋混凝土构筑物,耐久性为普通钢筋混凝土构筑物的10倍。制备这种超高耐久性混凝土的技术途径是在混凝土中掺乙二醇醚衍生物和氨基醇衍生物这二种化合物。经试验,该混凝土的特性如下: 1.降低干燥收缩率的效果其干燥收缩率为普通混凝土的50～60%,对控制干燥收缩引起的裂缝有很好的效果。 2.控制碳化发展的效果其碳化发展速度约为普通混凝土的1/3,可长期防止钢筋的锈蚀。 3.控制氯离子渗透的效果其氯离子渗透速度约为普通混凝土的1/4,在沿海地区可控制氯离子对混凝土内部钢筋的锈蚀。 4.抗冻性能含气量为1%的普通混凝土,抗冻融性极差;而超高耐久性混凝土,即使含气量为1%,也因各个气
Japan recently developed a “ultra-high durability concrete” with a durability of 500 years. With its reinforced concrete structures, its durability is 10 times that of ordinary reinforced concrete structures. The technical way to prepare this kind of ultra-high durability concrete is to mix two compounds, a glycol ether derivative and an amino alcohol derivative, in the concrete. After testing, the properties of the concrete are as follows: 1. The effect of reducing the drying shrinkage The drying shrinkage rate is 50 to 60% of the ordinary concrete, and has a good effect on controlling cracks caused by drying shrinkage. 2. The effect of controlling the development of carbonization The rate of development of carbonization is about 1/3 of that of ordinary concrete, which can prevent corrosion of steel bars for a long period of time. 3. Control the effect of chloride ion penetration The chloride ion permeation rate is about 1/4 of that of ordinary concrete. In the coastal area, chloride ions can be controlled to corrode the steel inside the concrete. 4. Frost resistance Normal concrete with air content of 1% is extremely resistant to freezing and thawing, while ultra-high durability concrete, even if the gas content is 1%, is due to various gases.