风积砂质高浓度胶凝充填材料性能与粉煤灰掺量关系分析

发布时间：2018-11-10 11:24

【摘要】：充填材料是决定煤炭充填开采效益、效率、效果的最主要因素。为了掌握风积砂质高浓度胶凝充填材料的性能变化规律,本文以粉煤灰的质量掺入比作为变量,试验研究和理论分析了粉煤灰对该充填材料性能的影响规律。结果表明,粉煤灰的适量添加可以提高充填材料的强度,大掺量导致强度相对降低;泌水率随着粉煤灰掺量的增大总体上呈减小趋势,较大掺量试样泌水速率相对较低;分层度随着粉煤灰掺量的增大线性降低;凝结时间随着粉煤灰掺量增大呈现指数增大;坍落度总体上随粉煤灰掺量的升高而增大,但大掺量会使其出现相对降低。分析认为,适量粉煤灰的掺入,使风积砂质高浓度胶凝充填材料的颗粒粒度、水分分布和水泥分散均匀,而使材料的强度和输送性能适度改变,但掺量过大会稀释胶结料和改变颗粒相对级配而导致性能下降。
[Abstract]:Filling material is the most important factor to determine the benefit, efficiency and effect of coal filling mining. In order to understand the performance change law of the high concentration cementing filling material of aeolian sand, the influence of fly ash on the performance of the filling material was studied and theoretically analyzed by taking the mass ratio of fly ash as the variable. The results show that proper addition of fly ash can increase the strength of the filling material, and the strength decreases with the increase of fly ash content, and the bleeding rate decreases with the increase of fly ash content, and the bleeding rate of the sample with large amount of fly ash is relatively low. The stratification degree decreases linearly with the increase of fly ash content, the setting time increases exponentially with the increase of fly ash content, and the slump increases with the increase of fly ash content as a whole. It is considered that the addition of proper amount of fly ash can make the particle size, water distribution and cement dispersion of the high concentration cementing filling material of aeolian sand uniform, while the strength and transport performance of the material can be changed moderately. However, the properties of the binder decreased due to the dilution of the binder and the change of the relative gradation of the particles.
【作者单位】：中煤科工集团西安研究院有限公司;
【基金】：国家自然科学基金(51404295) 陕西省自然科学基础研究计划(2015JQ5185) 中煤科工集团西安研究院有限公司科技创新基金(2012XAYFX006)资助
【分类号】：TD823.7

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