圆形ckd基碱活化混凝土的抗冻融性能和氯离子渗透性

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-30 DOI:10.1016/j.istruc.2025.109308

Omid Bamshad , Amir Mohammad Ramezanianpour , Alireza Habibi

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The results revealed that CKD-based CAAC and AAC had comparable durability properties to PCC and COC under freeze-thaw condition. So, the sorptivity coefficient of 28-day AAC, CAAC, PCC, and COC specimens after 50 freeze-thaw cycles was 0.226 kg/sec0.5.m2, 0.245 kg/sec0.5.m2, 0.317 kg/sec0.5.m2, and 0.388 kg/sec0.5.m2, respectively. Furthermore, the results of rapid chloride permeability test (RCPT), rapid chloride migration test (RCMT), and bulk electrical conductivity (BEC) showed that CKD-based CAAC and AAC had lower chloride ion penetration than COC and PCC. So, the migration coefficient of 28-day AAC, CAAC, PCC, and COC specimens was 7.5 E-12 m2/s, 8.8 E-12 m2/s, 17.7 E-12 m2/s, and 20.7 E-12 m2/s, respectively. Finally, the pore structure of the specimens revealed that the total porosity of alkali-activated specimens was less than PCC and COC before and after freeze-thaw cycles. 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引用次数: 0

摘要

碱活化混凝土（AAC）是一种利用工业副产品开发的可持续建筑材料，以消除混凝土生产中水泥的使用。本研究的目的是利用水泥窑粉尘（CKD）和再生碱活化混凝土骨料（RGA）开发循环碱活化混凝土（CAAC），并将其性能与AAC、波特兰水泥混凝土（PCC）和循环普通混凝土（COC）进行比较。四种混合方案的抗压强度设计在同一范围内。通过压汞孔法（MIP）和扫描电镜（SEM）对其进行了冻融性能、氯离子渗透性等实验和微观结构分析。结果表明，基于ckd的CAAC和AAC在冻融条件下的耐久性与PCC和COC相当。因此，经过50次冻融循环后28天的AAC、CAAC、PCC和COC试样的吸附系数为0.226 kg/sec0.5。 公斤/ sec0.5 0.245平方米,。 公斤/ sec0.5 0.317平方米,。M2, 0.388 kg/sec0.5。平方米,分别。快速氯离子渗透性试验（RCPT）、快速氯离子迁移试验（RCMT）和体积电导率试验（BEC）结果表明，基于ckd的CAAC和AAC的氯离子渗透性低于COC和PCC。因此，AAC、CAAC、PCC和COC样品28天的迁移系数分别为7.5 E-12 m2/s、8.8 E-12 m2/s、17.7 E-12 m2/s和20.7 E-12 m2/s。冻融循环前后，碱活化试样的总孔隙率均小于PCC和COC。冻融循环50次后，90 d AAC、CAAC、PCC和COC试样的总孔隙率分别增加1.95 %、2.56 %、3.27 %和4.18 %。可以认为，由于ckd基CAAC与AAC的抗压强度、耐久性和微观结构差异较小，因此首选采用ckd基CAAC。

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Freeze-thaw resistance and chloride permeability of circular CKD-based alkali-activated concrete

Alkali-activated concrete (AAC) is a sustainable construction material developed with industrial by-products to eliminate the use of cement in concrete production. The aim of this study was to develop AAC using cement kiln dust (CKD) and recycled alkali-activated concrete aggregate (RGA), namely circular alkali-activated concrete (CAAC), and its properties were compared with AAC, Portland cement concrete (PCC), and circular ordinary concrete (COC). The compressive strength of the four mix scenarios was designed in the same range. Several experiments including freeze-thaw resistance and chloride ion permeability, as well as micro-structural analysis were performed through mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). The results revealed that CKD-based CAAC and AAC had comparable durability properties to PCC and COC under freeze-thaw condition. So, the sorptivity coefficient of 28-day AAC, CAAC, PCC, and COC specimens after 50 freeze-thaw cycles was 0.226 kg/sec^0.5.m², 0.245 kg/sec^0.5.m², 0.317 kg/sec^0.5.m², and 0.388 kg/sec^0.5.m², respectively. Furthermore, the results of rapid chloride permeability test (RCPT), rapid chloride migration test (RCMT), and bulk electrical conductivity (BEC) showed that CKD-based CAAC and AAC had lower chloride ion penetration than COC and PCC. So, the migration coefficient of 28-day AAC, CAAC, PCC, and COC specimens was 7.5 E-12 m²/s, 8.8 E-12 m²/s, 17.7 E-12 m²/s, and 20.7 E-12 m²/s, respectively. Finally, the pore structure of the specimens revealed that the total porosity of alkali-activated specimens was less than PCC and COC before and after freeze-thaw cycles. The total porosity of 90-day AAC, CAAC, PCC, and COC specimens after 50 freeze-thaw cycles was increased by 1.95 %, 2.56 %, 3.27 %, and 4.18 %, respectively. It could be stated that regarding the minor difference between compressive strength, durability, and microstructure of CKD-based CAAC and AAC, using CKD-based CAAC is preferred.

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.