综合记者蒋峰等的报导，我国也出现象美英等国过去出现的水泥混凝土工程早期破坏的现象，对国民经济带来巨大损失。如我国在修筑水泥混凝土高等级公路312国道时，其期望寿命20年不维修，虽然这一指标低于发达国家的要求，可是在某些路段，还不到10年已出现多处裂纹、碎块；首都 Reports by the comprehensive reporter Jiang Feng et al., China has also experienced phenomena such as the early destruction of cement concrete works in the United States, Britain, and other countries, which caused huge losses to the national economy. For example, when China builds the 312 national highway of cement concrete high-grade highway, its life expectancy is not maintained for 20 years. Although this index is lower than the requirements of developed countries, in some road sections, there have been many cracks and fragments in less than 10 years. Block