Study On Classification Of Coal Gangue Based On Anti-freezing Vegetation

Vegetation concrete is able to adapt to the growth of green plants,but also has a certain protective function of concrete and its products.Coal gangue is a solid waste that is produced during coal mining and coal washing processes.In the course of the experiment,the author found that most of the common vegetation damage occurred at the node,the coarse aggregate was destroyed rarely,and the coal gangue was replaced with the gypsum as the coarse aggregate.It found that coal gangue as coarse aggregate the strength is low,but to meet the requirements of vegetation concrete Therefore,the new anti-freeze vegetation concrete with coal gangue as coarse aggregate is obtained.[P].China: CN104326709 A.However,It found that due to the diversity of chemical composition of coal gangue,the complexity of mineral composition,the uncertainty of stacking time and the scale of production have brought great technical bottleneck to the choice of coal gangue in the production of coal gangue antifreeze when the concrete is produced.Coal gangue as a thick aggregate used in anti-frozen vegetation concrete,and today the community has not been too much research,coal gangue as a coarse aggregate to replace some of the broken stone made of anti-freeze vegetation concrete performance indicators Change,people also know very little about this.Therefore,it is of great significance to study the gangue antifreezing vegetation with different substitution rates at different grades.In this paper,the coal gangue crushing index and the influence of water absorption on the compressive strength and frost resistance of coal gangue coarse aggregate anti-freeze vegetation were analyzed,and the coal gangue was graded and the coal gangue was frozen Vegetable concrete made of coal gangue grade standards:(1)Coal gangue with crushing index less than 16% and water absorption less than or equal to1.5% is grade Ⅰ coal gangue;crushing index greater than 16% less than or equal to 21%,water absorption greater than 1.5% less than or equal to 2.5% for the Ⅱ Class coal gangue;crushing index more than 21%,water absorption more than 2.5% of coal gangue for the class Ⅲ coal gangue.(2)The use of Ⅲ class coal gangue to replace part of the stone after the production of coal gangue concrete damage is coarse aggregate damage,the lack of strength;the use of Ⅱ class coal gangue to replace part of the stone after the production of coal gangue vegetationconcrete damage is The combination of coarse aggregate destruction and node failure can not only meet the requirements of strength,but also to achieve the use of coal gangue waste;the use of grade Ⅰ coal gangue to replace part of the stone after the production of coal gangue vegetation damage and ordinary vegetation Concrete damage is similar to the main node damage,coarse aggregate damage is very small,indicating that the strength of coal gangue has not been fully utilized,you can use this type of coal gangue to have a higher strength requirements of the experimental study.(3)According to the experimental data analysis,the use of Ⅱ class coal gangue to produce coal gangue antifreeze vegetation concrete,coal gangue replacement rate of 40%,the compressive strength,freeze-thaw cycle to meet the requirements of anti-frozen vegetation performance to meet the waste mineral utilization Most of the principle,so the optimal replacement rate of coal gangue coarse aggregate is determined to be about 40%.