百色水利枢纽大坝二等变形监测控制网测量

Test and Study on Permeability Performance of Plastic Concrete

百色水利枢纽大坝初始变形监测控制网起算点遭到破坏,观测被迫中断,为了更好地对大坝进行监测,根据大坝及周围环境特点,针对现场复杂的测量条件,设计了大坝变形监测的二等基准控制网测量方案,采用测量机器人进行测量,并对外界条件的影响进行了改正。测量结果表明:测量控制网的测量精度较高,达到了预期目标。

The paper studies the influence of factors of water-cement ratio,amount of bentonite,amount of coal powder and sand ratio to the permeability performance of plastic concrete through orthogonal tests of plastic concrete.The outcomes show that a) the water-cement ratio is the key affecting factor.Properly reducing water-cement ratio in the design of mixture can increase the impermeability performance of plastic concrete;b) when the amount of bentonite and sand ratio keep 50% and 60% respectively,the impermeability performance of plastic concrete is relatively better and;c) when same amount of coal powder replaces cement,the impermeability performance of plastic concrete in 28 days reduces somewhat,but increases in the later stage as the increase of amount of coal powder.