对再生沥青路面集料进行预处理以减少渗滤液对水泥水化的影响

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2023-11-01 DOI:10.1016/j.cemconres.2023.107305
Amir Behravan , Michael Lowry , Mehdi Ashraf-Khorasani , Thien Q. Tran , Xu Feng , Alexander S. Brand
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引用次数: 0

摘要

近年来,为了证明在混凝土中使用再生沥青路面(RAP)骨料的合理性,人们做出了许多努力。所有先前的研究似乎都一致报告说,使用不同比例的RAP会降低具体性能。RAP骨料在混凝土中的不良性能主要是由于界面过渡区(ITZ)更大、更多孔以及沥青的粘结破坏所致。本研究假设,对ITZ的有害影响可归因于沥青涂层在高pH孔溶液中浸出的有机化合物。该研究证明了孔隙溶液中存在有机化合物,并证明了渗滤液对水泥水化的影响。本研究还尝试在氢氧化钠(NaOH)溶液中预处理RAP,以预浸出有机化合物。预处理表明,有机化合物被浸出,NaOH修饰了沥青表面化学。然而,只有一个边际的改善,在抗压强度被观察到完成预处理。
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Effect of pretreatment on reclaimed asphalt pavement aggregates for minimizing the impact of leachate on cement hydration

Many efforts have been made in recent years to justify the use of reclaimed asphalt pavement (RAP) aggregates in concrete. All previous efforts appear to unanimously report a reduction in concrete performance with varying proportions of RAP usage. The poor performance of RAP aggregates in concrete is attributed mainly to a larger, more porous interfacial transition zone (ITZ) and the cohesive failure of the asphalt. This study hypothesizes that the detrimental impact on the ITZ is attributable to organic compounds leached from the asphalt coating in the high pH pore solution. This study proves the presence of organic compounds in the pore solution and demonstrates that the leachates impair cement hydration. This study also attempted to pretreat the RAP in a sodium hydroxide (NaOH) solution to pre-leach the organic compounds. The pretreatment demonstrated that organic compounds were leached and that NaOH modified the asphalt surface chemistry. However, only a marginal improvement in compressive strength was observed by completing a pretreatment.

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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
期刊最新文献
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