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《建筑砌块与砌块建筑》2019,(1)
透水混凝土路面砖铺装后填充接缝材料,形成"自透水+缝隙透水"透水模式,有利于路面形成长期透水效果和透水性能的修复。本项目在实验室,采用模型研究在缝隙宽度相同时,不同级配和粒径的接缝材料,对路面初始透水系数、多次堵塞清理后的透水性能的影响。综合考虑透水路面初始透水系数及使用后透水系数恢复率,建议选择粒径为(3mm~5mm)50%与(1.5mm~2.5mm)50%石英砂复配作为缝隙透水路面接缝材料。 相似文献
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为解决透水混凝土堵塞问题,首先设置对照组,改变骨料粒径、水灰比和静压时间,研究透水混凝土透水性能变化情况,然后对比高压水枪、清水、吸尘器3种清洗方式对堵塞状态下透水混凝土透水性能的影响。结果表明,透水混凝土的透水能力随骨料粒径与孔隙率的增大而增大,随水灰比和静压时间增大而减小。水灰比小于0.33时,对透水系数影响较小;静压时间在0~90 s之间时,透水系数变化最为明显。高压水枪清洗后透水系数恢复比率达85.04%,该方法对堵塞试件的透水性能恢复效果最好,其次是吸尘器,恢复比例为63.85%,清水组最差,仅为41.6%。 相似文献
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为探究憎水剂SHP60对透水混凝土抗堵塞性能的影响及作用机理,采用水滴润湿边角试验观测SHP60对材料憎水性影响;通过SEM观察冲水前后试件的孔隙及颗粒形状变化;研究了SHP60掺量对透水混凝土初始孔隙率及使用过程中抗堵塞性能的影响,优选最佳SHP60掺量。结果表明:SHP60使材料水滴润湿边角增大2倍左右,使材料具有憎水性;SHP60对透水混凝土抗堵塞性能由对初始透水能力的削弱和对使用过程中透水能力的增强耦合。优先考虑透水性能的提高,其次考虑抗压强度条件下,SHP60最佳掺量为透水混凝土配合比干料质量的0.35%。 相似文献
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为改善路面透水性能,聚合物透水混凝土已逐渐广泛用于海绵城市的建设中。试验采用特细砂和环氧树脂制备透水材料,通过控制变量法,分别探讨砂的粒径和聚合物掺量对透水混凝土的抗压强度以及透水系数的影响;并进行了堵塞的模拟实验,基于图像分析透水混凝土的孔径大小,通过观察混凝土的微观结构分析其性能变化规律。实验结果表明,在粒径相同的情况下,随着环氧树脂掺量的增加,环氧树脂透水混凝土的抗压强度逐渐提高,而透水系数逐渐下降;环氧树脂透水混凝土抗压强度会随着较大粒径颗粒复掺含量的增大呈现先增加后下降的趋势,而透水系数呈现不断增大的趋势。当骨料粒径为0.15~0.3mm,环氧树脂掺量为骨料质量的5%时,制品的平均孔隙率为14%,平均等效直径为214μm;当粒径为0.15~0.3mm和0.3~0.6mm的骨料复掺比例为1:1时,综合效果较好,抗压强度达41.7MPa,透水系数为1.7mm/s,制品堵塞4次循环后,透水衰减系数小于20%,防堵塞性能良好。 相似文献
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以透水路面混合料最佳矿料级配和统一的油石比,通过控制空隙率,分析比较了基质(石油)沥青混合料、乳化(PC-3)沥青混合料、SBS改性沥青混合料在OGFC-13下的透水路用性能。对混合料的高温稳定性、低温抗裂性能、透水系数进行大空隙透水沥青混合料(OGFC-13)的路用性能对比分析得出,SBS改性沥青更适合作为大空隙透水沥青混合料的材料,但在25%的空隙率下,其性能略高于规范要求,为保证其使用性能,不建议将SBS改性沥青混合料的路用空隙率定为25%。 相似文献
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为缓解聚合物透水混凝土路面硬化后脆性发展对路面的破坏,在已有经验和结论基础上研究聚丙烯纤维改性聚合物透水混凝土路面的路用性能。以无溶剂聚氨酯为胶黏剂,复掺聚丙烯纤维透水混凝土为道路面层,制作路段模型进行抗氯离子渗透、承载力、抗冲击和路面径流削减等一系列试验研究,并与普通透水混凝土对比分析。结果表明:普通透水混凝土与聚合物透水混凝土渗透系数分别为初始渗透系数的81%与92%,普通透水混凝土较聚合物透水混凝土易堵,主要由于聚合物乳液改善了新拌透水混凝土的工作性能,提高了混凝土的致密性; 胶乳中含有大量活性物质,在混凝土水化、硬化过程中增加了胶乳与集料及水化产物的黏附性; 聚丙烯纤维改性聚合物透水混凝土面层承载力较聚合物透水混凝土面层承载力提高了52%; 随着聚丙烯纤维掺量的增加,抗冲击性能增强,在复掺聚丙烯纤维掺量(质量分数)为1.5%时,抗冲击性能提高245.9%; 聚丙烯纤维改性聚合物透水混凝土路面雨量径流系数为0.11~0.29,较普通透水混凝土路面有更好的径流削减效果。 相似文献
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在路面防滑性方面,表面纹理曾长期地被认为是主要因素,但没有定量计算不同表面参数是透水混凝土路面的防滑性。引入了分形几何,通过分形插值可精确模拟透水混凝土断面轮廓曲线。结合轮胎/路面接触模型,表面纹理的优化方法被应用于设计和建造具有防滑性和低噪音的混凝土路面中。结果表明,相比于传统的槽式或暴露粗骨料的混凝土路面,透水混凝土路面的表面纹理非常耐用。 相似文献
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透水混凝土技术应用探讨 总被引:3,自引:2,他引:3
针对人行道路面的诸多质量问题,提出了新型材料———透水混凝土,介绍了透水混凝土的定义、特点及材料要求,阐述了透水混凝土的配合比设计及试验方法,表明了透水混凝土技术将是解决城市人行道使用要求及排水问题的最佳方案。 相似文献
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透水水泥路面混凝土具有良好的透水性,能够缓解公路积水和城市环境问题,是一种环保型的混凝土。本文讨论了透水水泥路面混凝土的原材料选择、配合比设计及施工工艺,并展望了透水水泥路面混凝土的应用前景。 相似文献
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The objective of this study was to evaluate different pervious concrete test specimen preparation techniques in an effort to produce specimens having properties similar to in-place pervious concrete pavement. Cylinders and slabs were cast using pervious concrete from three different paving projects using different procedures. The comparisons of cast specimens to pavement cores were based on infiltration rate, density, and porosity. Of the cylinder consolidation procedures tested, the standard Proctor hammer provided the least variability of results and yielded properties similar to the in-place pavement. However, 600 mm square slabs were even more consistent with the in-place pavement density and porosity. 相似文献
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This paper reports the results of a two year field monitoring exercise intended to investigate the pollution abatement capabilities of a novel system which offers an alternative to the, now well established, pervious pavement system as a source control device for stormwater management. The aim of this study was to determine the effectiveness of a live installation of a macro-pervious pavement system (MPPS) (operated as a visitors' car park at a prison in Central Scotland) in retaining and treating a range of pollutants which originate from automobile use or become concentrated on the parking surface from the wider environment. The MPPS is a sub-class of pervious pavement system where the vast majority of the surface is impermeable. It directs stormwater into a pervious sub surface storage/attenuation zone through a series of distinct infiltration points fast enough to prevent flooding during the design storm. In the particular system studied here the infiltration points consist of a network of oil/silt separation devices with extensive further pollutant retention/degradation provided during the passage of stormwater through the sub surface zone. Approximately 12 months after the car park was completed a sampling regime was instigated in which grab samples were collected at intervals from each of the three sub catchments whilst, simultaneously, samples were collected directly from the, pollutant retaining, infiltration devices. Through investigation of samples collected at the upstream end of the system, the retention of significant amounts of hydrocarbons and heavy metals in the initial collection devices has been illustrated and the analysis of effluent samples collected at the outlet points indicate that the system is capable of producing effluent which is of a standard comparable to that expected from a traditional pervious pavement system and is acceptable for direct release into a surface water receptor. The system offers the opportunity to accrue the benefits of a pervious pavement when the use of traditional paving surfaces is the preferred option. 相似文献
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对多孔混凝土进行了介绍,指出多孔混凝土路面是透水路面、低噪声路面、更为安全的路面,重点研究了多孔混凝土路面的组成结构、强度、透水系数及耐久性,归纳了多孔混凝土路面的主要优点,从而促进多孔混凝土路面的研究应用。 相似文献
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较高的噪声和抗滑耐久性不足是水泥混凝土路面的两大难题,本文针对此介绍了欧美普遍使用的混凝土路面构造,包括人造草皮拉毛、粗麻布拉毛、横向刻槽、纵向刻槽、金刚石研磨以及露石混凝土路面、透水混凝土路面等,并对其降噪效果和抗滑性能进行评价。 相似文献
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《Construction and Building Materials》2010,24(5):818-823
Pervious concrete has been increasingly used to reduce the amount of runoff water and improve the water quality near pavements and parking lots. However, due to the significantly reduced strength associated with the high porosity, pervious concrete mixtures currently cannot be used in highway pavement structures. A laboratory experiment was conducted in this study to improve the strength properties of pervious concrete through the incorporation of latex polymer. This study focused on the balance between permeability and strength properties of polymer-modified pervious concrete (PMPC). In addition to latex, natural sand and fiber were included to enhance the strength properties of pervious concrete. The test results indicate that it was possible to produce pervious concrete mixture with acceptable permeability and strength through the combination of latex and sand. 相似文献