温度和骨料预湿对煤矸石砂浆流变性的影响  

The impact of temperature and pre-wetting of aggregates on rheological properties of coal gangue mortars

作　　者：王振波 范雨润 左建平[1] WANG Zhenbo;FAN Yurun;ZUO Jianping(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083

出　　处：《矿业科学学报》2024年第2期190-198,共9页Journal of Mining Science and Technology

基　　金：国家自然科学基金(51808545,52225404);中央高校基本科研业务费专项资金(2023ZKPYLJ05)。

摘　　要：矿山充填、巷道喷射等工程对施作材料的流变性要求较高。水泥基材料中的骨料类型、状态与所处的环境对砂浆流变性能有显著影响。本文以煤矸石砂代替石英砂作为水泥基材料的细骨料,研究温度与骨料预湿对砂浆流变性的影响规律及作用机理。结果表明,煤矸石砂浆的剪切应力-剪切速率关系符合Herschel-Bulkley(H-B)模型特征,流变指数大于1,稠度明显大于石英砂砂浆;煤矸石砂浆的表观黏度随温度升高而不断降低,但骨料预湿的影响不大;30℃下煤矸石砂浆的屈服应力为2.99 Pa,比10℃下提高1.45倍,预湿后则提高2.13倍;煤矸石砂浆的触变环面积大于石英砂砂浆,预湿煤矸石砂浆的触变环面积为398.4 Pa/s,干燥煤矸石砂浆则减小为283.3 Pa/s。研究结果将为煤矸石砂的合理利用、复杂环境下流变材料的设计与制备提供支撑。Mine filling and tunnel spraying projects pose high requirements on the rheological properties of cement-based materials.The types,conditions of fine sands and the exposed environment have significant effects on the rheological properties.In this light,this paper uses coal gangue sand instead of quartz sand as the fine aggregate of cement-based material and investigates the effect of temperature and aggregate prewetting on the rheological properties of mortar and its mechanism.Results show that the shear stress-shear rate relationship of coal gangue mortar conforms to the characteristics of Herschel-Bulkley(H-B)model,with higher rheological index(higher than 1)and higher consistency than that of quartz sand mortar.The apparent viscosity of coal gangue mortar decreases with increasing temperature,but the effect of aggregate prewetting is not significant.The yield stress of coal gangue mortar at 30 ℃ is 2.99 Pa,1.45 times higher than that at 10 ℃,and 2.13 times higher after prewetting.The thixotropic ring area of coal gangue mortar is higher than that of quartz sand mortar,and the thixotropic ring area of pre-wetting coal gangue mortar is 398.4 Pa/s,while that of dry coal gangue mortar is 283.3 Pa/s.The obtained results are expected to provide evidence for the rational utilization of coal gangue sand and the design and preparation of rheological materials served in complex environment.

关 键 词：砂浆 煤矸石 温度 预湿骨料 流变性 

分 类 号：TU578[建筑科学—建筑技术科学] TD350[矿业工程—矿井建设]