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Title: | Properties of a lightweight fly ash–slag alkali‐activated concrete with three strength grades | Authors: | Wang, H Wu, Y Wang, L Chen, H Cheng, B |
Issue Date: | Jan-2021 | Source: | Applied sciences, Jan. 2021, v. 11, no. 2, 766, p. 1-21 | Abstract: | Lightweight alkali‐activated concrete (LAAC) is a type of highly environmentally friendly concrete, which can provide the benefits of both alkali‐activated material and lightweight concrete. The study aimed to investigate the influence of different water/solid (W/S) ratios on the properties of normal‐weight/lightweight fly ash–slag alkali‐activated concrete manufactured at ambient tem-perature. The relative performance of the alkali‐activated concrete (AAC) mixes with limestone and sintered fly ash lightweight aggregates as the coarse aggregates was also compared to the conventional ordinary Portland cement (OPC) concrete mix in terms of their compressive stress–strain re-lationship, splitting tensile strength and fracture parameters. The morphologies and microstructure of the four types of interfacial transition zones (ITZs) were characterized by scanning electron mi-croscopy (SEM). Results indicated that the AAC had a higher tensile strength, stress intensity factor, brittleness and lower elastic modulus than its cement counterpart. With the decrease in the W/S ratio, the density, compressive and tensile strength, ultrasonic pulse velocity, fracture energy, brittleness and elastic modulus of the AAC increase. However, the influence of the W/S ratio on the mechanical properties of the LAAC with lightweight porous aggregates was less than that of the normal‐weight AAC. Predictive models of the splitting tensile strength, fracture energy and elastic modulus of the AAC were also suggested, which were similar to those of the OPC concrete. Fur-thermore, the microstructure investigation showed that no wall effect occurred in the ITZ of the AAC. The ITZ structure of the hardened AAC was also more compact and uniform than that of the OPC concrete. | Keywords: | Ambient curing Fly ash–slag alkali‐activated concrete Lightweight aggregate Mechanical properties Water–solid ratio |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | Applied sciences | ISSN: | 2076-3417 | DOI: | 10.3390/app11020766 | Rights: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). The following publication Wang, H.;Wu, Y.;Wang, L.; Chen, H.; Cheng, B. Properties of a Lightweight Fly Ash–Slag Alkali-Activated Concretewith Three Strength Grades. Appl. Sci. 2021, 11, 766 is available at https://doi.org/10.3390/app11020766 |
Appears in Collections: | Journal/Magazine Article |
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