论文部分内容阅读
目前,水泥混凝土配合比是按规定强度设计的,浇制的构件要求具有一定的使用时期。但是回顾过去的一百多年,混凝土的使用表明,这种建筑材料易遭受风化和老化的损害。根据目前混凝土配合比设计工艺,假定风化对混凝土的影响不很严重,如果有影响,也只是轻微的,因而,在配合比设计中应包括纠正系数,以补偿风化对混凝土的影响。但是,这种假定是完全错误的,因为混凝土构件受各种自然现象的风化作用(象冷热周期变化、湿干交替)和水化、氧化、碳化及水解等化学作用引起的体积变化,这一过程
At present, cement concrete mix is designed according to the required strength, pouring the components required to have a certain period of use. However, reviewing the past hundred years, the use of concrete shows that such construction materials are vulnerable to weathering and aging. According to the current concrete mix design process, it is assumed that the weathering effect on concrete is not very serious. If it is affected, it is only slight. Therefore, the correction factor should be included in the mix design to compensate for the effect of weathering on the concrete. However, this assumption is completely wrong because the concrete components are subject to various natural phenomena of weathering (such as periodic changes in cold and warm, alternating wet and dry) and changes in volume caused by chemical actions such as hydration, oxidation, carbonization and hydrolysis, etc. A process