酿成塌楼垮桥事故的“豆腐渣”工程以及地震灾害中倒塌的建筑 ,除施工中偷工减料等天灾人祸因素外 ,材料方面的混凝土变质也是一大诱因。最近 ,日本新干线的铁路隧道、桥梁发生的几次混凝土崩塌事故就是水泥中混有沙土、盐分潮解所致。建筑工地上“百年大计”的口号首先靠施工 The “bean curd residue” project that led to the collapsing bridge collapse and the buildings that collapsed during the earthquake disaster, apart from natural and man-made factors such as labor-saving and material reduction in the construction, concrete deterioration in materials is also a major inducement. Recently, several concrete collapse accidents occurred in railway tunnels and bridges in the Shinkansen in Japan resulted from the deliquescence of salt mixed with cement. Construction site on the “hundred years plan” slogan first by construction