Research On Mechanical Properties Of Ecological Material Based On Fly Ash Utilization

With the rapid development of economic and the urbanization progresses,the problem of garbage treatment and environmental protection increasingly prominent,how to coordinate a good relationship between them,to achieve waste recycling while reducing damage to the environment has become a worthy one problem which should be thought.Ecology rock is a way to solve this problem.This article embarked on waste incineration ash recycling,in order to find a solution to the problem of waste incineration ash feasible method,study on mechanical properties of fly ash mixed with soil,while taking into account the ecological function of ecological restoration techniques to repair plant,Research on effect of fly ash on Bermudagrass and bermudagrass root growth and mechanical properties of the composite substrate mixing fly ash,study as a basis to explore its application in terms of roads,embankments,ecological slope protection,municipal green area with soil and so on.The main work of this paper is divided into three parts:(1)the first part is to explore the impact of the waste incineration fly ash’s content on soil shear strength;by direct shear tests indoors,explore five mixed ash content(0,5%,6.7 %,10%,20%),the impact of waste incineration ash on soil shear strength,in a word,the amount of ash mixed impact on soil c,φ values.Experiments show: ash for soil shear strength has improved to some extent,its strength the most significant impact on the amount of ash mixed with interval of 5% to 8%,in this phase the growth of the content of mixing fly ash significantly increased the soil’s shear strength,and in the other sections,this is not obvious.The influence of fly ash on the cohesion of the mixed dust existence of two sides,at first the growth of the content of mixing fly ash will encourage the rapid increase of cohesion,but when the content of mixing fly ash reaches 5% to 9% range,the negative effects of fly ash appears,in this phase its cohesion declined rapidly,after that,there is no significantly decreased,but cohesion of mixed dust has been lower than for prime soil cohesion.It is showed that adding the right amount of ash did not impair the mechanical properties of the original soil,and to some extent,enhance soil mechanics indicator.(2)explore the affect of different moisture content(16.9%,20.9%,24.9%,28.9%,32.9%)of the five-doped of fly ash on shear strength,which the moisture content affect on c,φ values of the mixed dust.Research on is still done by direct shear tests indoor.Experimental results show that: in the five ash content,cohesion of the mixed dust are first increasing essentially linearly with increasing of the moisture content,then curved down and have achieved a peak at the optimum moisture content(24.9%).And when the moisture content of less than 24.9%,the cohesive force of five fly ash content under the same moisture content,its size significantly change the law,But more than 24.9%,the exhibit irregularity.And in five content of fly ash,the internal friction angle of mixed dust are basically linear increasing with the increase of moisture content at the first,after that,it start to fall down roughly as a parabolic,but the rate of decline is less than the rate of rise,which indicate that the appropriate moisture content has some internal friction angle enhancement,once the excess will be significantly reduced internal friction angle values.(3)research on effect of the ash content on the growth of plant and how the root effects on the mechanical properties of the composite substrate of root soil.The experiment was divided into two s,the first phase is to conducted model tests to elect suitable plants under conditions of fly ash,through the model test that plant the bermudagrass,tall fescue and Mulan in different ash content,to find which one is more suitable under the ash.Then planting bermudagras in five(0.5%,6.7%,10%,20%)ash content,the observed number of Seedling and its growth conditions,to identify how the fly ash impact on bermudagrass growth.The second phase is to conducted direct shear tests with the test block which plant with bermudagrass to explore the influence of roots on the mechanical properties of mixed dust.The results showed that: when the doping amount exceeds 5% ash,fly ash began to inhibit the growth of bermudagrass,reducing the amount of roots which are contained in test blocks mixed with the ash more than 5%,and strengthen the role of roots on the soil shear strength began to cut weak,and the impact of fly ash on soil are not disturbed by roots.The roots make no difference on internal friction angle.