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https://hdl.handle.net/2440/136945
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Type: | Journal article |
Title: | The influences of metakaolin, w/b ratio and fibers on the properties of green-HFLWC |
Author: | Liu, H. Elchalakani, M. Yehia, S. Ali Sadakkathulla, M. Xie, T. Yang, B. |
Citation: | Construction and Building Materials, 2022; 361:129664-1-129664-16 |
Publisher: | Elsevier |
Issue Date: | 2022 |
ISSN: | 0950-0618 1879-0526 |
Statement of Responsibility: | Huiyuan Liu, Mohamed Elchalakani, Sherif Yehia, Mohamed Ali Sadakkathulla, Tianyu Xie, Bo Yang |
Abstract: | A new approach to control depletion of natural resources and CO2 emission during concrete production, lightweight aggregate, low-C3A cement and supplementary cementitious materials were utilized to develop a greenhigh strength flowable lightweight concrete (green-HFLWC). The green-HFLWC was developed incorporating low-C3A cement, metakaolin (MK), fly ash (FA) stalite and silica sand. Effects of metakaolin, w/b ratio and different types of fibers on concrete properties were investigated. The results showed that the green-HFLWC incorporating MK with 0.26 w/b ratio could reach high strength (28-day compressive strength of 89 MPa), high flowability (slump flow of 652 mm) and lightweight (oven-dry density of 1883 kg/m3). In addition, it was found that long polypropylene (LPP) fibers increased the splitting tensile strength of HFLWC by 71 % and reached 136 % of equivalent flexural strength ratio of HFLWC compared to the control mix. Moreover, flexural strength of HFLWC with 2 % volumetric ratio of LPP fiber was better than that of the short polypropylene (SPP). At the same time, the steel-LPP hybrid fibers decreased compressive strength by 56 % compared to the control mix. Also, the water absorption ratio for most of mixes was less than 2 %. Furthermore, the CO2 emission and cost of each mix were calculated and a new carbon emission intensity index (Csi) is proposed. Considering the excellent mechanical (high specific strength >40, high ductility with fibers) and durability performance (low water absorption ratio <2 %, high carbonation resistance) of green-HFLWC (Csi <12), it is recommended for the future high-rise buildings located in harsh environment. |
Keywords: | High flowable; High strength; Metakaolin; Lightweight concrete; Low C3A cement |
Description: | Available online 11 November 2022 |
Rights: | © 2022 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.conbuildmat.2022.129664 |
Grant ID: | http://purl.org/au-research/grants/arc/DP210101425 |
Published version: | http://dx.doi.org/10.1016/j.conbuildmat.2022.129664 |
Appears in Collections: | Civil and Environmental Engineering publications |
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