Experimental Investigation Of Corrosion-induced Cover Cracking Of Multi-mineral Admixtures Concrete

When the concrete structure in a relatively poor environmental conditions,concrete reinforcement corrosion will lead to concrete cracking corrosive protective coating,in particular long-term concrete structure works in marine concrete structures by the chloride ion erosion and alternating wet and dry change of reinforced surface,so the concrete in marine concrete structures structure works faster than normal concrete structure,Damage caused by steel corrosion direct and indirect losses is much larger. therefore,how in the design,construction methods appropriate to quote to ensure that the service life of buildings to achieve the desired engineering has become a hot issue of great concern.In this paper,to study the marine concrete structure,around the mineral admixture mechanism of steel corrosion in concrete,the impact of mineral admixture concrete protective layer corrosive conditions and corrosive cracking patterns such as cracking start,through the theoretical analysis and experimental study of the combination of mineral admixture corrosive protective layer of concrete cracking analysis of influencing factors.The results show that:With the water-to-binder(w/b) ratio,the fly ash content and the cover-to-diameter(c/d) ratio increases,concrete mineral admixture corrosive protective coating steel corrosion rate when the crack will also increase accordingly,with slag and silica fume content increases,reducing the rate of steel corrosion,a model to calculate the ratio of corrosion which taking into account of the factors above was proposed by non-linear regression according to the test data.The results calculated by the formula agree well with of the measured results.