The Planting Concrete Test And Its Engineering Application In Slope Of Small River

With the rapid development of science and economy,human life,production and other activities undermine the original ecological cycle,and cause water shortage,floods,water pollution,as well as rivers and lakes degradation and many other water problems.In the face of numerous water problems,various basic water conservancy projects have attempted to adapt the river ecosystem to human activities.In terms of river drainage,the drainage patterns of traditional water conservancy projects are mostly simple and rapid,and only consider how to make the floods faster and smoother.The original ecological channels are straightened by cutting,Quality masonry,dry masonry and other concrete river bank revetment,making the river water storage,water seepage capacity weakened,blocking the river and ecological land of the water cycle;Moreover,this kind of dense hard material slope protection "Cold,hard" feeling,and the surrounding natural landscape that is not coordinated.Also is not in conformity with the country in recent years put forward "the person and the nature harmoniously" correctly ecological management idea.Therefore,the new environmental protection material is an inevitable trend of ecological river course.In this paper,the design of the porosity as the target value,the volumetric method for its mix of a large number of experiments,according to their design of different mix of grass preparation of ecological specimens,measuring its compression,flexural strength,PH value and plant growth were analyzed.The results of the experiment were tested and the influencing factors such as mechanical property,p H value and plant growth were obtained.The results show that the ratio of liquid to solid,aggregate diameter and sand content is the main factors affecting the strength and porosity of the grass-planting concrete.The compressive strength,flexural strength and erosion resistance of the ecological concrete increase with the increase of the solid-and the porosity increased with the increase of particle size.The linear relationship between the dosage of cement paste and the negative correlation between the grass planting concrete and the porosity was P = 32.515-0.022 Wj,R2 = 0.985,and when the amount of cement paste in the 520 ~ 560 kg / m3,the measured porosity of 20% to 21%,compared with the target porosity 20% smaller deviation,28 d test piece strength 7 ~ 8MPa,To meet the small rivers in the treatment of concrete strength of the slope protection requirements.Based on the analysis of the above factors,the optimum mixing ratio of the grass planting concrete is as follows: 1m3 ecological grass planting concrete aggregate grading proportion of 15 ~ 30 mm is 1480 kg,river sand dosage is150~200kg,The amount of cement is 205~235 kg,the dosage of silicon powder is 15 kg,the dosage of SR-4 is over 3L,the dosage of water is 100~ 110L;The 28 d compressive strength,flexural strength and anti-erosion strength of the ecological grass planting concrete were 8.75 Mp,3.05 Mp,0.17,porosity 24% and p H 8.25,respectively,which accorded with the requirement of the related performance index in small river treatment.According to the specific requirements of river bank revetment,this paper analyzed the selection of suitable grass species in Jiangxi Province,the ratio of suitable materials and filling methods,and carried out several times the best proportion of grass-planting concrete planting test,Suitable suitable material,the plant can grow well in the grass-planting concrete slope protection.