为有效解决回填工程中传统填料压实不足的难题,利用开挖粉土、水泥和水作为原材料制备具有自流平和自密实特性的新型回填材料。同时,为提高工业废弃物的资源化利用程度,进一步降低工程造价,将氧化铝工业产生的赤泥引入到回填材料的制备中,用以代替部分水泥。在混合料配合比设计中,以流动度作为控制指标,得到水固比为0.43时所制得的混合料满足流动度要求(200～300 mm)。在此基础上,通过一系列室内试验,分别对混合料的流动性、泌水性和抗压强度进行了研究。试验结果表明:赤泥含量的增加能减小拌合物的流动度和泌水率,并且能加快泌水完成时间;用赤泥替代部分水泥,并不影响混合料强度的增长速率;与不掺加赤泥的混合料强度相比,赤泥替代水泥掺量在10%～15%范围时的混合料强度会增大,而赤泥替代量<10%或>15%时的混合料强度均会减小。对于粉土流动化回填材料,赤泥在泌水稳定性和强度方面均展现出良好的应用前景。
Abstract
A new type of backfill material with self-leveling and self-compacting properties was prepared with excavated silt, cement and water as raw materials to effectively solve the problem of insufficient compaction of traditional fillers in backfilling projects. The red mud produced by the alumina industry was incorporated into the backfill material to replace part of the cement, with the purpose of improving the utilization of industrial waste and further reducing construction cost. With flowability as the control index in mix proportion design, the mixture with a water-solid ratio of 0.43 could meet the flowability requirement (200-300 mm). Furthermore, the flowability, bleeding and compressive strength of the mixture were examined respectively via indoor test. Results demonstrated that the increase of red mud could reduce the flowability and bleeding rate of the mixture, and meanwhile accelerate the bleeding. The partial replacement of cement by red mud does not affect the growth rate of the mixture’s strength. The strength of the mixture increases when red mud content is in the range of 10%-15%, while declines when red mud content is smaller than 10% or greater than 15%. Red mud has a good application prospect in terms of bleeding stability and strength for flowable silt backfill materials.
关键词
流动化回填材料 /
工业固废 /
赤泥 /
粉土 /
流动度 /
泌水率
Key words
flowable backfill materials /
industrial solid waste /
red mud /
silt /
performance /
bleeding rate
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基金
中国博士后科学基金项目(2019M652302);山东省自然科学基金项目(ZR2017QEE009)
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