Research On The Basic Mechanical Properties And Engineering Applications Of Copper Tailings Ground Polymer Concrete

As an important material of infrastructure construction,concrete not only brings convenience to people’s life,but also leads to a sharp decline in natural asrd and stone resources,In addition,in the process of replacing old and new infrastructure constructin,a large amount of solid waste is generated.How to convert solid waste into recyclable resources has become a key idea to solve the lack of sand and gravel resources.Therefore,it is of great research significance and engineering applicatin value to develop a new type of concrete material with environmental protection and good mechanical properties to replace natural coarse and fine aggregates in traditional concrete with tailings materials of different particle sizes.This paper takes ordinary concrete poles as the research background and geopolymer concrete as the ressarch basis,and uses different dosages of tailings materials and different modulus alkali activator solutions to determine the optimal mix ratio.On the basis of the optimal mix ratio,the mechanical propcrties and durability of the material were further analyzed.Finally,according to its mechanical properties,the reinforcement calculation andcrack resistance check calculation are carried out,and the practical engineering feasibility study of the tailings geopolymer concrete pole is carried out.The main research contents of this paper are as follows:(1)The mixing ratio design experiment was carried out.Based on the previous orthogonal research on geopolymer concrete by our research group,the mixing ratio design experiment was carried out with the content of copper tailing sand and copper tailing ore and the modulus of alkali activator as dependent variables.By studying the concrete in the national standard ofelectrie poles,the optimal mix ratio is obtained by taking the concrete slump and the concrete compressive strength as the control variables.(2)Explored the effects of different types and dosages of additives on the performance of tailings geopolymer concrete.Evaluate its effectiveness through slump and compressive strength;Characterized and evaluated the elimination status of apparent bubbles;Perform elemental changes and microscopic analysis using EDS and SEM.The experimental results indicate that the correct type and appropriate dosage of additives ensure the improvement of surface bubbles and strength of concrete,and the addition of slag and dispersed latex powder can play a role in controlling the slump of concrete;The use of defoamers can actually reduce the compactness of concrete structures.(3)Based on the optimal mix ratio test,conduct basic mechanical performance tests and durability tests on tailings aggregate concrete.The experimental results show that when the content of tailings is 70%and the modulus of alkali activator is 1.3M,the slump is 6cm,the compressive strength is 70.3MPa,the initial setting time is 90min,the final setting time is 270min,the splitting tensile strength reaches 7.0MPa,and the flexural strength is 4.6MPa;After 125 freeze-thaw cycles,the mass loss rate reached 5%and the dry shrinkage rate was 0.16%.Establish a damage and deterioration model for tailings aggregate concrete based on the mass loss rate and relative dynamic elastic modulus loss rate of concrete under different freeze-thaw cycles.(4)The reinforcement formula proposed based on the design specifications of concrete poles has been optimized for new materials.The system has carried out reinforcement calculation,crack resistance,crack bending moment,and crack width verification.After calculation,the reinforcement area of reinforced concrete poles with a tip diameter of 230mm and a length of 15m must reach 314.(5)Based on the calculation of mechanical properties and durability,as well as the reinforcement amount and pole performance,practical engineering application research is conducted on tailings polymer materials to further verify their performance.