The Test Method Research Of Detected Fiber Cement Mortar Compressive Strength Based On Post-install Pullout Method

At present, the economy of our country maintains a rapid development, so is the construction industry. Due to the aging building and the modification of building function, and so on, leaving the buildings in need of reinforcement. In the field of reinforcement, the method based on fiber cement mortar reinforcement is used widely and economically. However, the method which tested the compressive strength on the scene of the layer with fiber reinforced cement mortar is not mature and there is no uniform standard. To obtain a reliable method of testing the compressive strength of fiber reinforced cement mortar, We study on the post-install pullout method to test the compressive strength of the fiber cement mortar in this thesis. The main contents and conclusions are as follows:(1) Simulate the actual reinforcement, synthetic fiber( polypropylene fiber and polyvinyl alcohol fiber) cement mortar and steel fiber cement mortar were respectively used to reinforce plain concrete blocks. According to mix proportion, each fiber cement mortar strength varies 9 grades, which is M20?M30?M40?M50?M60?M70?M80?M90 and M100. When reinforing the plain concrete block, the testing cubes is made accordingly. The test cubes and reinforced specimen were placed under the same condition. The post-install pullout is being used to test the thin fiber reinforced cement mortar after 28 days' natural maintenance. According to the limit relationship between the representative value of the pullout force and the value of the corresponding compressive strength of fiber cement mortar test cubes, we performed simple linear regression analysis. We can get three strength measurement formula of fiber cement mortar through the test and analysis.(2) Evaluae the significance for strength measurement formula of simple linear analysis. The relative deviation for three kinds of the strength formula of the fiber cement mortar is small. The precision is high and the effection of the test is remarkable. The strength formula of steel fiber cement mortar has the minimum deviation and the best tested effection. After the nonlinear analysis of the modern, we compared the results of the linear fitting analysis and the nonlinear analysis,so was the comparison between the post-install pullout and pack out first in the methon of testing compressive strength of fiber cement mortar.(3) We have analysed the destruction form and the compressive strength of the fiber cement morta with the post-install pullout method. There is analysis of influenced factors for the post-install pullout method from objective and subjective aspects.(4) The post-install pullout method to test the compressive strength of fiber cement mortar can provide reference for " Technical specification for inspection of cement mortar and fiber reinforced cement mortar strength by pullout method " and generalize applyments in actual projects.