共查询到19条相似文献,搜索用时 156 毫秒
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水灰比和骨料级配的改变对透水混凝土性能的影响效果十分明显,二者作为透水混凝土的基本配合比影响因素,主要研究了不同水灰比和不同骨料级配对透水混凝土性能的影响。采用体积法进行透水混凝土基准配合比设计,通过分析不同因素对物理性能、力学性能和透水性能的影响,结果表明:在同一骨料级配下,连续孔隙率和透水系数随着水灰比的增大而减小,抗压强度先增大后减小;在同一水灰比下,单一骨料级配透水系数和连续孔隙率较大。在混合级配中随着9~14.5 mm粒径骨料占比的增加,透水混凝土的连续孔隙率和透水系数均表现为下降趋势,而抗压强度表现为先增加后减小。并通过数据拟合分析了连续孔隙率、抗压强度和透水系数三者之间的关系。 相似文献
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在体积法的基础上,考虑了孔隙率、骨料级配和粒径、水胶比、外加剂掺量这些设计参数,并以C30配合比设计为例进行了计算并试验,结果表明该配合比符合透水混凝土性能要求,希望在透水水泥混凝土配合比设计方面能够为同行提供参考。 相似文献
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通过透水混凝土配合比的设计实例,介绍了透水混凝土配合比设计的方法和步骤,分析了影响透水混凝土性能的因素。文中的透水混凝土按体积法的设计原理,以粗集料空隙率、目标孔隙率、水灰比为配合比主要指标,对试件的透水系数、抗压强度、抗折强度进行综合控制.从而获得最终配合比。 相似文献
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主要研究了粗、细骨料粒径、级配以及砂率变化对混凝土质量的影响,测定了在基准配合比下,砂的细度模数变化以及碎石颗粒级配变化对混凝土质量的影响,并就骨料粒径、级配的变化对混凝土质量的影响从理论上进行了初步的分析。 相似文献
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基于颗粒最紧密堆积原理,确定了超高性能混凝土的胶凝材料组成和轻集料颗粒级配,优化得到了轻集料超高性能混凝土(LUHPC)的基准配合比.研究了轻集料粒形、轻集料预吸水率和掺量对LUHPC工作性能和力学性能的影响规律,并利用超景深三维数码显微镜、扫描电子显微镜等探究了轻集料对LUHPC性能的影响机理.结果 表明:轻集料的粒形和预吸水率是影响LUHPC工作性能和力学性能的关键因素;随着轻集料粒形由碎石形转变为球形,LUHPC的工作性能和力学性能均显著优化;随着轻集料预吸水率的增加,LUHPC工作性能改善,但抗压强度和劈裂抗拉强度均呈现先增加后降低趋势;随着轻集料掺量的增加,LUHPC工作性能和力学性能均先提升后降低;轻集料主要通过增大颗粒球形度、改善轻集料-水泥石界面黏结性和预湿内养护来提升LU-HPC的工作性能和力学性能. 相似文献
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Xiang Shu Baoshan Huang Hao Wu Qiao Dong Edwin G. Burdette 《Construction and Building Materials》2011,25(8):3187-3192
Portland cement pervious concrete (PCPC) is an environmentally friendly paving material that has been increasingly used in parking lots as well as low volume and low speed pavements. Although specifications are available for the mix design and construction of pervious concrete, there still remains a need for laboratory tests to ensure the anticipated performance of laboratory designed pervious concrete. In this study, the performance of laboratory and field produced pervious concrete mixtures as well as field cores were evaluated and compared through laboratory performance tests, including air voids, permeability, compressive and split tensile strengths, as well as Cantabro and freeze–thaw durability tests. Two types of coarse aggregate, limestone and granite, with two gradings, No. 8 and No. 89 specified in ASTM C33, were used to produce the mixtures. Latex, air-entraining admixture (AEA), and high range water reducer (HRWR) were also added to improve the overall performance of pervious concrete. The results indicated that the mixtures made with limestone and latex had lower porosity and permeability, as well as higher strength and abrasion resistance than other mixtures. Even for pervious concrete, the addition of AEA could still help to improve the freeze–thaw resistance. The comparison between laboratory and field mixtures showed that a properly designed and laboratory verified pervious concrete mixture could meet the requirements of permeability, strength, and durability performance in the field. 相似文献
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