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今年2月在印度新德里召开的第十届国际预应力混凝土会议上,有7篇报告对高强度混凝土(50～80牛/毫米~2)的性能、应用和存在的问题进行了论述,有些学者认为高强度混凝土是今后混凝土发展的主要方向。目前采用一般的生产方法,如选用优质水泥、采用合适的配合比和水灰比,掺加适量的硅粉和外加剂,就可以获得高强度混凝土,其强度最高值可达到120牛/毫米~2,弹性模量可达45千牛/毫米~2左右。目前,已有一些国家在应用高强度混凝土中,取得了一些实践经验: 挪威用75牛/毫米~2的混凝土,修建了一条为煤气管线铺设的水下混凝土隧道(起桥的作用),每
At the 10th International Prestressed Concrete Conference held in New Delhi, India, in February this year, 7 reports discussed the performance, application and existing problems of high-strength concrete (50-80 N/mm2). Some scholars It is considered that high-strength concrete is the main direction for the future development of concrete. At present, general production methods are adopted. For example, high-quality concrete can be selected, high-strength concrete can be obtained by using suitable mix ratio and water-cement ratio, adding appropriate amount of silica fume and admixture, and its maximum strength can reach 120 N/mm. 2, the elastic modulus can reach 45 kN/mm~2. At present, some countries have obtained some practical experience in the application of high-strength concrete: Norway has used a concrete of 75 N/mm~2 to build a submerged concrete tunnel laid for gas pipelines (to act as a bridge).