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Behavior of alkali-activated slag pastes blended with waste rubber powder under the effect of freeze/thaw cycles and severe sulfate attack
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-09-12 , DOI: 10.1016/j.conbuildmat.2020.120716
Alaa M. Rashad , Dina M. Sadek

At present, the need to include waste materials such as waste rubber as a part of building materials is getting more attention rather than any other time. The incorporation of waste rubber as a part of building materials decreases the landfills and reduces the consumption of virgin raw materials. Most of the previous studies incorporated waste rubber as a part of aggregate(s). Thus, this work is the first attempt to study the opportunity of including waste rubber powder (W-R-P) as a part of precursor of alkali-activated slag (AAS) pastes aiming to increase their resistivity against the deterioration resulting from freeze/thaw cycles and severe sulfate attack. For this reason, the slag was partially replaced with W-R-P at ratios from 1% up to 15%, by weight. All the pastes were activated by sodium silicate. After curing, pastes were exposed to 5–20 cycles of freeze/thaw as well as 5–20 cycles of immersion in 5% NaSO4 for 15 h followed by drying at 80 °C for 6 h. The compressive strength before and after exposure was measured. Thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were conducted to analyze the results. The results showed that despite the incorporation of W-R-P particles have a negative effect on the compressive strength, their particles have a positive effect on mitigating the deterioration resulting from freeze/thaw cycles and severe sulfate attack.



中文翻译:

碱活化矿渣糊与废橡胶粉共混物在冻融循环和严重硫酸盐侵蚀下的行为

目前,越来越需要将废旧橡胶等废旧材料作为建筑材料的一部分,而不是其他任何时间。将废橡胶纳入建筑材料的一部分可以减少垃圾填埋场并减少原始原材料的消耗。先前的大多数研究都将废橡胶作为骨料的一部分。因此,这项工作是首次尝试研究将废橡胶粉(WRP)作为碱活化矿渣(AAS)浆料的前体的一部分的机会,目的是提高其抵抗由冻结/解冻循环和严酷条件引起的劣化的抵抗力硫酸盐侵蚀。由于这个原因,炉渣以重量百分比从1%到15%的比例被WRP部分取代。所有糊剂均被硅酸钠活化。固化后4小时15小时,然后在80℃下干燥6小时。测量暴露前后的抗压强度。进行了热重分析(TGA)和扫描电子显微镜(SEM)以分析结果。结果表明,尽管掺入WRP颗粒对抗压强度有负面影响,但它们的颗粒对减轻因冻融循环和严重的硫酸盐侵蚀引起的劣化有积极作用。

更新日期:2020-09-12
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