Projects per year
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 green-high 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.
Original language | English |
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Article number | 129664 |
Journal | Construction and Building Materials |
Volume | 361 |
DOIs | |
Publication status | Published - 26 Dec 2022 |
Fingerprint
Dive into the research topics of 'The influences of metakaolin, w/b ratio and fibers on the properties of green-HFLWC'. Together they form a unique fingerprint.Projects
- 1 Active
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Geopolymer concrete for thin-walled structures in marine environment
Hadi, M., Elchalakani, M., Ali, M. & Sheikh, N.
1/12/21 → 1/12/23
Project: Research
Research output
- 1 Citations
- 1 Doctoral Thesis
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High performance fibre-reinforced lightweight concrete
Liu, H., 2023, (Unpublished)Research output: Thesis › Doctoral Thesis
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