Cement-based Planting Ecological Concrete Preparation Technology Work Performance Study

At present,in our country's slope protection project,the traditional slope protection method has caused irreversible damage to ecological environment,and ecological construction is imperative.As a new type of ecological slope protection material,vegetative ecological concrete can either play the dual role of slope protection or ecological protection.At present,there is a lack of systematic research on the design and application of vegetative ecological concrete in our country.In this paper,the research on plant-type ecological concrete is carried out from the selection of raw materials,the design of mix ratio,the test of basic performance and the application of ecological slope protection.The selection of raw materials is mainly aimed at the utilization of industrial waste.The choice of coarse aggregate is pumice which in Zhangbei district,ZhangJiakou city and disused slags which in Xuanhua Steel.Mineral additives include fly ash and iron tailing powder.Mix proportion design of Planting Eco-concrete based on volumetric method.It is found that the 28-day compressive strength,permeability coefficient and pore alkalinity of plant-grown eco-concrete are more than 15 MPa,10 mm/s and 8-10 respectively.There was a new discovery has been founded through in depth experimental research.A reasonable process was obtained based on the literature review and experimental methods.The paper adopts the orthogonal method to arrange experimentation and based on the relative theories in order to select out final plan about the mix proportion design of Planting Eco-concrete and analysis the influence of different cementing materials on the Planting Eco-concrete strength,permeation coefficient,porosity and alkalinity.Through the design of Planting Eco-concrete,experiment results and theoretical analysis come out that fly ash can decrease the concentration of calcium hydroxide in concrete.The basic principle is that hydration of fly ash decrease the concentration of calcium hydroxide in cement-hydrate which reduces the concentration of free alkaline ions in concrete.The test results also show that iron tailing powder is in favor of the enhancement of the concrete strength.It is verified that the key influence factor of the concrete strength is configuration of cement paste hole.Reducing the alkalinity value of concrete by increasing the content of the fly ash is better than increasing the content of the iron tailing powder.A study of the property of natural materials of concrete is made in this paper,to achieve reduce the concentration of free alkaline ions in concrete by decreasing the amount of cement.The results of the experiments showed that alkalinity were about and most of greater than 12-13 when the alkalinity of concrete were detected until 30 th day,Effects that the alkalinity of concrete is detected was improved but was not obvious,cannot be used for planting.In this paper,after 28 days of maintenance of plant-type ecological concrete,alkali reduction was carried out by soaking method and spraying ferrous sulfate method.The results show that the alkali reduction effect is remarkable,and the alkalinity reaches 9-11.Through the simulation on measured data about the durability tests of Planting Eco-concrete by adopting slow freezing,the result show: concrete structures were beginning break down on the edge areas of the concrete when the freeze-thaw cycles were conducted more than 40 times,but does not meet all quality criteria,the mass losses ratio varied between3% and 4%;when the freeze-thaw cycles were conducted more than 55 times,the mass losses ratio about 5%,concrete would be damaged in various degrees.