论文部分内容阅读
一、概况采用真空脱水技术是砼施工工艺的重要改革,它被列为当代砼施工四项新术技之一。真空脱水砼,28天抗压强度约提高15～25%,抗折强度约提高10～15%,劈裂强度、弹性模量和表面硬度均提高15～30%,与钢筋粘结力约提高50～100%。真空砼由于具有初始强度,故可以快速脱模,提高模板周转率,加快施工进度,可立即进行原浆机械抹面和压光,可提高砼表面硬度,使成型后的构件缩短静定时间,可节省蒸汽消耗量30%左右,可节省水泥10～20%。采用真空脱水,还可用流动性砼代替干硬性砼,便于实现机械化施工和提高经济效益。
I. Overview The use of vacuum dewatering technology is an important reform in the construction process. It is listed as one of the four new technologies for contemporary construction. Dehydration in vacuum, 28 days compressive strength increased by about 15 to 25%, bending strength increased by about 10 to 15%, splitting strength, elastic modulus and surface hardness were increased by 15 to 30%, and the bond strength with steel increased 50 to 100%. Because of its initial strength, the vacuum crucible can be quickly demolded, increase the turnover rate of the template, speed up the construction progress, and can immediately carry out the surface smearing and calendering of the original pulp machine, which can increase the surface hardness of the crucible and shorten the static definite time of the components after molding. Saving about 30% of steam consumption, it can save 10~20% of cement. Vacuum dehydration can also be used to replace dry hard helium, to facilitate mechanized construction and improve economic efficiency.