Study On The Basic Performance Of Sisal Fiber Construction Waste Recycled Bricks

With the continuous acceleration of my country’s modernization and infrastructure construction,the demand for bricks is increasing,and the environmental pollution caused by the production of bricks is also becoming more and more serious.To solve the problem of resource consumption and environmental pollution in the brick production process,the most effective way is to change the raw materials and production methods needed to produce bricks.Using construction waste recycled aggregates to replace raw materials for brick production can not only alleviate the demand for clay,protect the environment,but also recycle resources.Because construction waste recycled aggregates have low strength and are easy to crack,this article incorporates sisal fiber into buildings.Improve the performance of construction waste recycled bricks in waste recycled bricks.Mainly studied the material properties of different construction waste aggregates and their influence on the performance of recycled bricks,the content of different sisal fibers and the influence of different construction waste aggregates on the mechanical properties of construction waste recycled bricks.And using X-ray diffraction and scanning electron microscopy and other testing techniques to study the influence of sisal fiber on the hydration of the recycled brick system,the following conclusions were obtained:(1)Compared with natural aggregate,construction waste recycled aggregate has lower performance than natural aggregate,and even the water absorption rate is much higher than natural aggregate.When making construction waste recycled bricks,additional water consumption should be increased to make the surface of aggregate Pre-wetting to ensure the bonding performance of the aggregate and cement mortar;but in general,recycled aggregate can be used to prepare construction waste bricks that do not require high strength.(2)The waste ceramic tile recycled bricks mixed with sisal fiber have the best performance among different construction waste bricks.Its compressive strength is slightly reduced at 28d,and the minimum decrease is only 2.19%when the sisal fiber content is3.0kg/m~3.The flexural strength of recycled tiles of discarded ceramic tiles mixed with sisal fiber is improved,and the increase is 19.9%when the content of sisal fiber is 4.5kg/m~3.The influence of sisal fiber on the strength of the specimens is generally on the rise,but the increase will slow down when it continues to increase.The optimal overall performance of compressive strength and flexural strength is obtained at 3.0kg/m~3and meets the requirements of standard brick MU15.(3)The law of influence of sisal fiber on the flexural and compressive properties of construction waste recycled bricks.As the content of sisal increases,it changes in the form of a cubic curve that first increases and then decreases.The formula for comparing the strength of the test piece.(4)After the sisal fiber is mixed,many pores are generated at the interface between the sisal fiber and the slurry.This part of the pores is that the sisal fiber is mixed as an organic matter and cannot be completely integrated with the recycled brick system,resulting in a test block When force is applied,the interface transition zone with sisal fiber will lead to the formation of tiny cracks damaged by recycled bricks,resulting in a decrease in compressive performance.However,the density of C-S-H gel mixed with sisal fiber recycled brick system is significantly higher than that of the unmixed group,and the degree of hydration is higher.The hydration product ideally fills the pores between unreacted cement particles and effectively strengthens The bonding force between the aggregate and the cement paste is the main factor that has a beneficial effect on the flexural performance of sisal fiber construction waste recycled bricks.