煤矸石作为骨料对不同水泥基材料耐久性影响*
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中南大学土木工程学院 湖南 长沙,中南大学土木工程学院 湖南 长沙,中南大学土木工程学院 湖南 长沙,中铁西安勘察设计研究院有限责任公司,中铁西安勘察设计研究院有限责任公司

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TU411.92

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Effect of coal gangue as aggregate on the durability of cement-based materials
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Central south university,,,,

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    摘要:

    研究了我国四个地区所产煤矸石的基本性能及其作为骨料对C30混凝土和CFG桩抗冻性和抗酸侵蚀性能的影响。结果表明:本文所选各煤矸石主要组成分为石英、蒙脱石和菱铁矿等矿物,但氧化含量有较大不同;泡水饱和状态下各煤矸石单轴抗压强度均降低55%以上;冻融循环28次后,各煤矸石质量损失按产地从大到小为榆林,长治,太原和许昌;酸侵蚀下,长治煤矸石的压碎指标较酸侵蚀前增大最明显。许昌煤矸石配制的C30混凝土,当煤矸石取代石灰石粗骨料大于30%后,抗冻性能显著降低,随煤矸石掺量的增加,C30混凝土抗酸性能降低,但不显著。酸侵蚀140d时,CFG-长治质量损失率大于5%,抗压腐蚀系数低于0.8,抗酸性能显著降低,其它煤矸石CFG抗酸性能变化不显著。

    Abstract:

    The basic properties of coal gangue produced in four regions in China were investigated, and the effect of coal gangue as aggregate in cementitious materials on the frost resistance and the acid corrosion resistance were studied. Results show that the main components of each coal gangue selected in this paper are quartz, montmorillonite, siderite and other mineral, but the oxidation content is quite different. The uniaxial compressive strength of each coal gangue is reduced by more than 55% after complete soaking. After 28 freeze-thaw cycles, the order of mass loss rate of each coal gangue is Yu Lin, Chang Zhi, Tai Yuan, Xu Chang. After acid corrosion, the crushing index of coal gangue produced in Chang Zhi increase is the biggest. For the concrete with C30 grade incorporating Xu Chang coal gangue, when the replacement of coal gangue to stonelime is beyond 30%, the frost resistance of concrete decreases obviously. With the coal gangue content increasing, concrete acid corrosion resistance is on the decline, but not significant. For the CFG-Chang Zhi, after 140d acid corrosion, the mass loss is greater than 5%, the compressive corrosion coefficient is lower than 0.8 and its acid corrosion resistance reduced significantly, but the changes of other kinds of coal gangue CFG’s acid corrosion resistance is not significantly.

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李霖皓,马昆林,龙广成,等. 煤矸石作为骨料对不同水泥基材料耐久性影响*[J]. 科学技术与工程, 2019, 19(1): .
李霖皓,,,et al. Effect of coal gangue as aggregate on the durability of cement-based materials[J]. Science Technology and Engineering,2019,19(1).

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  • 收稿日期:2018-08-26
  • 最后修改日期:2018-12-27
  • 录用日期:2018-10-23
  • 在线发布日期: 2019-01-15
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