Experimental Research On The Durability And Life Prediction Of Theordinary Concrete Field Exposure In ZhongWei

The concrete of salty soil region in northwestern areas is suffering from drying-wetting cycle, freezing-thawing cycle and bittern erosion, so the durability of this concrete is confront with growing damage. ZhongWei region is no exception, the region has the sufficient sunshine, strong solar radiation, temperature difference is bigger, dry climate, etc. The buildings in salty soil region in ZhongWei area are not only influenced by alternating hot and cold, dry and wet cycle or alternate freezing and thawing environment factors, but also suffer from the harmful salts. So study the problem of the durability of the concrete and promotion to the ZhongWei region and northwestern region seems particularly important.In terms of concrete durability life prediction, the researchers at home and abroad based on chlorine salt corrosion, carbonation corrosion, concrete raw materials affect aspects have done a lot of work, research results are relatively concentrated, but very few durability life prediction results based on sulfate attack.However, research about sulfate salty soil in ZhongWei is very few, let alone ZhongWei typical salty soil region based on the sulfate corrosion of concrete durability life prediction research. In this article, by contrast the indoor experiment and the embedding test, the experiment of ZhongWei salty soil region based on the sulfate corrosion of concrete durability life prediction is carried out. Analysis of outdoor exposure test data in ZhongWei and look to relatively objective evaluation parameters for the assessment of concrete in ZhongWei are on the way, addition to make predictions about the life of the concrete in ZhongWei.This article main research content is as follows:The first, design test plan:in view of the actual situation in ZhongWei, we will simulate the concrete in the dry-wet circulation, the freeze-thaw cycle conditions of corrosion and design indoor accelerated test plan.The second,selection the parameters of the durability evaluation:in addition to using the relative quality loss evaluation parameters and the relative dynamic elastic modulus evaluation parameters to reflect the durability, comparing various evaluation parameters and looking for more realistic evaluation parameters.The third, selection of influencing factors:in order to get better and more comprehensive durability prediction model, mainly divided into three groups, a set of single factor under the action of freezing-thawing cycle of concrete durability, a set of main consideration under the coupled action of sulfate and the dry-wet cycle concrete durability, the third group is outdoor exposure test, which buried the block in the corresponding outdoor location for durability research.The last, thedurability life prediction:according to the current domestic and international research on concrete durability and the life prediction method, designing the durability evaluation parameters and determining the parameters and the method to estimate service life of concrete. Compared in this paper, there are three kinds of damage degree of the durability of the concrete under different experimental conditions, in order to provide a little reference for Concrete durability life prediction in ZhongWei and the northwestern region.