| With the improvement of social productivity level,glass recycling cost has more than it's reproduction cost,resulting in a large number of abandoned glass,occupying people survival of production space,the researchers use different size of glass as the thickness of concrete aggregate to replace sand,but caused by alkali silica reaction effect is not very ideal,but found that after grinding glass fine glass beads has certain ash activity,grinding to a certain fineness of low dosage of beads in a beneficial effect on concrete but with the increase of dosage of glass powder concrete strength decreased rapidly,the high content of glass powder concrete early strength can meet the specification requirements.In order to reduce the pollution caused by cement and increase the waste utilization of glass,this paper adopts autoclaved curing method to study the properties of glass as cementing material.Autoclaving is an effective curing method to improve the early strength of concrete products.By accelerating the hydration process of cement under high temperature and high pressure,the autoclaving strength of cement products can reach 28 d of ordinary curing strength after several hours of autoclaving,which has been playing an important role in precast concrete.In this paper,autoclaved curing contrast standard curing is adopted,and different proportion of waste glass powder is used to replace cement to prepare glass powder composite cement mortar.The change of mechanical properties and drying shrinkage of waste glass powder composite mortar was studied by means of X-ray diffraction analysis and scanning electron microscopy,and the change of the strength and drying shrinkage of mortar was studied by means of linear equation fitting.The results showed that:(1)influence on the benchmark cement mortar.Autoclastic curing can effectively improve the early strength of the benchmark cement mortar.Accelerated hydration under high temperature and high pressure environment enables the 3d strength of the benchmark cement mortar to reach 28 d strength,and the strength is increased by 61.29%.(2)under standard curing,the strength of glass powder composite mortar decreases with the increase of glass powder replacement ratio,showing an adverse effect and showing a good linear correlation;However,the shrinkage rate of glass powder composite mortar decreased with the increase of glass powder replacement ratio,showing a beneficial effect and a good linear correlation.(3)the autoclaved curing processing,glass powder composite mortar strength with the increase of replacing ratio was "convex" type change,3 d,28 d,the dosage of 60 d-intensity variation and quadratic function equation of curve fitting is good,high mass fraction was 30%,the optimal proportion of its 3 d early strength is standard curing raised three times with the dosage of mortar strength,suggested that the preparation of glass powder in composite mortar beads instead of 30%.(4)the strength of glass powder composite mortar with 30% mass fraction for 60 days under autoclaved curing exceeds 17.6% of the benchmark cement mortar under the same condition curing,indicating that the activation of glass is better than cement by autoclaved curing;The drying shrinkage rate of glass powder composite mortar after autoclaved curing was lower than that of standard curing on the whole,and the dry shrinkage rate of 30% glass powder mortar decreased by 16.5% compared with 56 d standard mortar.(5)the microscopic electron microscope test found that the microstructure of the unautoclastic mortar was in the shape of ordinary particles,and many dense filamentous gels C-S-H filled gaps appeared in the glass powder composite mortar after the autoclastic curing,which is thereason why the strength of the glass powder composite mortar increased and the drying shrinkage rate decreased. |
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