Experimental Study On Performance Of Air-Entrained Concrete Mixed With Desert Sand

China is still in a developing country,and its infrastructure is not perfect.Building houses and engineering construction require a lot of sand,and resources of river sand are becoming increasingly depleted.River sand is often used in projects in various regions,and the exploitation of river sand by a large number of projects has caused environmental pollution and destroyed the geological landforms.Due to the state’s control over natural resources,the cost of sand for the project will also increase.Therefore,a large number of scholars have studied the use of desert sand in building fine aggregate instead of river sand to reduce the demand and dependence on river sand.Xinjiang is located in the western region,and desert sand resources are abundant,which is convenient for mining,and Xinjiang desert sand concrete is produced from this.However,due to the large specific surface area of desert sand,the amount of water required for mixing concrete is large,and it is easy to cause low slump,poor fluidity and low strength.At the same time,the desert sand contains components such as saline and chloride ions,which will reduce the durability of concrete.The air-entraining agent can improve the working performance and durability of the concrete,and the concrete strength can meet the requirements under the appropriate dosage.However,there are few studies on the properties of desert sand concrete mixed with air-entraining agents.Therefore,in this paper,the performance of air-entrained desert sand concrete is studied.By comparing five air-entraining agents(Sodium laurylsulfonate,Sodium alpha-olefin Sulfonate,Primary Alcobol Ethoxylate,Rosin pyrolytic polymer and Sodium ligninsulfonate),three air-entraining agents were selected,and three levels of each air-entraining agent were selected;three air-entraining agents(Sodium laurylsulfonate,Sodium alpha-olefin Sulfonate,Primary Alcobol Ethoxylate),each air-entraining agent and desert sand,chopped basalt fiber are selected at three levels,and a three-factor three-level orthogonal test is performed Select the orthogonal table L9(3~3).Each air-entraining agent orthogonal test is 9 groups,a total of 27 groups.Explore the influence degree and law of the three factors on the compressive strength,splitting tensile strength and flexural strength of concrete,and find the optimal level mixing combination of the three factors;compare the optimal horizontal mixing of the three air-entraining agents in the orthogonal test The experimental values of concrete mechanics under the combination of weight,select fatty alcohol polyoxyethylene ether,desert sand,and chopped basalt fiber to conduct the three-factor three-level orthogonal test again to explore the effect of three factors on the resistance of concrete to chloride ion penetration.The optimal level of various factors is combined.It provides a reference for the research and popularization of air-entrained concrete mixed with desert sand.The test data was analyzed by the range method and the variance method.The test results showed that the desert sand substitution rate of 40%had the most significant effect on the concrete strength,and the concrete strength was high,which was the best mixing rate.The chopped basalt fiber blending rate of 0.1%has a significant effect on improving the tensile and flexural strength of concrete,which is the best blending rate.Different types of air-entraining agents have different effects on the strength of desert sand and fiber reinforced concrete,but the strength is the strength of concrete with the increase of the level of air-entraining agent.The low level of air-entraining agent is the key.The air-entraining agent fatty alcohol polyoxyethylene ether,desert sand and chopped basalt fiber all have a significant positive effect on the electrical flux value of concrete.Desert sand has the most significant effect on concrete electrical flux,followed by air-entraining agent,and finally chopped basalt fiber.