Study On The Influence Of Moisture Content Andcuring Condition On The Performance Of Brick-Recycled Concrete

Due to the accelerated development of urbanization,a large number of buildings h ave risen from the ground,and a large amount of construction waste has also appeard.I n order to meet the coordinated development of economic construction and environme nt,the replacement of natural aggregates with recycled aggregates produced from wast e concrete and waste bricks not only meets the needs of economic construction but also reduces environmental problems.Therefore,it is urgent to study recycled concrete buil dings.Curing conditions are essential and critical factors in the hardening and microsc opic pore structure of concrete cement^[1],and adequate and reasonable maintenance ca n significantly improve the durability and mechanical properties of recycled concree.H owever,in the actual project,the construction conditions are not only affected by natur al factors,but also by the construction technology and working conditions.The perfor mance of recycled concrete under different curing conditions is quite different.In addit ion,due to the difference in geological environment of the foundation concrete membe rs of the building,the water content of recycled concrete under different geological env ironment conditions also has certain differences.Based on the above reasons,in the case of all the brick-filled construction waste r eplacing the natural coarse aggregate?brick content between 45%-55%?.three kinds o f brick-rich recycled concrete with different water-cement ratios?0.49,0.55,0.74?wer e confident to study different water content.And the effects of different curing conditio ns on its compressiestrength,tensile strength,shrinkage strain and ultrasonic wave velo city.Combined with relevant references at home and abroad,the obtained test results a re analyzed,some suggestions for the implementation of the project are put forward,a nd some results which can provide useful reference for the design and engineering appl ication of brickrich recycled concrete are obtained.The main contents of this thesis ar e as follows:?1?The influence of soaking time on the moisture content of brick-rich recycled c oncrete and the influence of water content on the compressive strength of brick-rich re cycled concrete cubes were studied.?2?Based on the ultrasonic wave velocity detection results,the variation of ultraso nic wave velocity with the compressive strength of recycled concrete under the condito nof water content is studied.Combined with the relevant experimental data,the compr essive strength of the brick-rich recycled concrete and the ultrasonic wave velocity ar e established.Conversion formula.?3?According to the change of compressive strength and tensile strength of brick-rich recycled concrete under different curing conditions,the most effective and conven ient construction and maintenance method was obtained,and the brick-rich recycled co ncrete was built.?4?Through the experimental study on the shrinkage performance of brick-rich re cycled concrete under the same water-cement ratio under different water-cement ratio c onditions under the same water-cement ratio conditions,the analysis of the curing cond itions and water-cement ratio is rich in bricks.The effect of shrinkage performance of r ecycled concrete gives the most effective curing conditions for restraining shrinkage,a nd which water-cement ratio has little effect on the shrinkage performance of recycld c oncrete.