Experimental Study On Dry Wet Effect Of Vegetation Concrete

The working performance of the vegetation concrete slope repairing substrate was restricted by many factors such as material composition,slope features,vegetation types and environment conditions.And various problems such as cracking,peeling,strength decline and nutrient loss of the substrate caused by the changeable dry and wet environment seriously affected the repairing effect of the damaged slope.Therefore,a comparative study on the working performance of substrate with different proportions under the alternation of dry and wet was carried out basing on the optimization and performance improvement of the substrate.Details are as follows:1)Aiming at the shear failure problems such as tear and dislocation in the process of dry-wet change,the shear strength of 6 ages and 7 wet and dry cycles was analyzed,and the relationship between the shear strength of the substrate and the content of straw cement,the curing age and the wet-dry cycles was obtained.2)Aiming at the problems of substrate structure change,nutrient loss and plant wilting,analyzing alfalfa potted plants substrate under dry and wet,rhizome root tensile force and pull the straw with shear strength of soil cement,the variation trend of substrate texture,gravel content,large aggregate and micro aggregate with the content of cement straw and dry and wet period was obtained.3)For the problems of dry and wet cracking and structural damage of the substrate,12 kinds of primary proportions were selected to carry out dry and wet alternation and extract crack development images to obtain the relationship between crack development process of substrate and the content of cement straw and the change of dry and wet cycles.4)Basing on the comprehensive test results,selecting 37 test indexes,entropy weight method and TOPSIS method were used to conduct a comprehensive evaluation of the base material quality of 12 primary proportions,and the optimal range of base material proportion in the dry and wet environment was preliminarily determined.Figure 34;Table 5;Reference 92...