Graduate Institute of Environmental Engineering, National Taiwan University, 71, Zhoushan Rd., Da'an Dist., Taipei City, 10673, Taiwan, Republic of China.
Department of Construction Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District., Taichung City, 41349, Taiwan, Republic of China.
Environ Sci Pollut Res Int. 2020 Jul;27(19):23742-23760. doi: 10.1007/s11356-020-08796-z. Epub 2020 Apr 16.
Pervious concrete (PC) provides multiple benefits, including reducing stormwater runoff, purifying water, recharging groundwater, and reducing the heat island effect. This study aims to determine an effective way to reuse municipal solid waste incinerator (MSWI) fly ash (FA), MSWI bottom ash (BA), and rice husk ash (RHA) as single or binary partial replacements for ordinary Portland cement (OPC) in PC. The ashes and PC specimens were characterized via X-ray fluorescence spectroscopy, X-ray powder diffraction, field emission-scanning electron microscopy, and Fourier transform infrared spectroscopy. The compressive strength, water permeability, and toxicity characteristic leaching procedure (TCLP)-released metals were investigated to evaluate the PC quality. The main components of the ashes were similar to those of OPC, suggesting that the ashes could be reused as cement materials; however, the cementitious activity of the ashes, especially MSWI FA, was relatively low. All ashes except 1100 °C MSWI FA met the standard requirements and can be applied as pozzolanic materials. The three PC specimens with binary replacements containing RHA (550, 700, and 900 °C) and MSWI BA (1100 °C) showed a synergistic effect and exhibited a higher 90-day compressive strength than the other specimens with single and binary ash replacements containing RHA (550 and 900 °C). The water permeability ranged between 0.106 and 0.391 cm/s, and the TCLP-released metal concentrations from all specimens met the regulatory standards of Taiwan. The results indicated that replacement with MSWI BA and RHA in cement materials provides an acceptable compressive strength and water permeability.
透水混凝土 (PC) 具有多种益处，包括减少雨水径流、净化水质、补给地下水和减少热岛效应。本研究旨在确定有效利用城市固体废物焚烧炉 (MSWI) 飞灰 (FA)、MSWI 底灰 (BA) 和稻壳灰 (RHA) 作为单一或二元部分替代普通波特兰水泥 (OPC) 的方法在 PC 中。通过 X 射线荧光光谱法、X 射线粉末衍射法、场发射扫描电子显微镜法和傅里叶变换红外光谱法对灰烬和 PC 试件进行了表征。研究了抗压强度、透水性和毒性特征浸出程序 (TCLP) 释放的金属，以评估 PC 的质量。灰烬的主要成分与 OPC 相似，表明灰烬可以作为水泥材料再利用；然而，灰烬的胶凝活性，特别是 MSWI FA，相对较低。除了 1100°C MSWI FA 之外，所有灰烬都符合标准要求，可以作为火山灰材料应用。含有 RHA（550、700 和 900°C）和 MSWI BA（1100°C）的二元替代物的三个 PC 试件表现出协同作用，具有比其他含有 RHA（550 和 900°C）的单一和二元替代物的试件更高的 90 天抗压强度。透水性在 0.106 到 0.391 cm/s 之间，所有试件的 TCLP 释放金属浓度均符合台湾的监管标准。结果表明，在水泥材料中用 MSWI BA 和 RHA 替代物可以提供可接受的抗压强度和透水性。
