Nduka, David and Olawuyi, B. J and FAGBENLE, EMMANUEL OLABAYO and Fonteboa, Belén G. (2022) Mechanical and microstructural properties of high performance concrete made with rice husk ash internally cured with superabsorbent polymers. Heliyon, 8. pp. 1-16.
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Abstract
An experimental study was carried out to determine the properties of rice husk ash (RHA) and its effect on highperformance concrete's (HPC) mechanical and microstructural properties. RHA content was placed at 0–30% at 5% step intervals and a constant water-binder ratio (W/B) of 0.3. A slump flow test was carried out to measure the workability property of the fresh HPC. In contrast, the influence of RHA contents on compressive, splitting tensile, flexural strengths and microstructural properties were examined for the hardened HPC specimens. The X-ray fluorescence (XRF), scanning electron microscopy-energy dispersive x-ray (SEM-EDX), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy-Attenuate total reflectance (FTIR-ATR), Thermogravimetry analysis (TGA), Brunauer, Emmett and Teller (BET) specific surface area and laser diffraction particle size distribution (PSD) were used to access the feasibility of RHA in HPC. XRD and SEM/EDX techniques were conducted to investigate the hydration products and microstructure in hardened HPCs. The post-test examination showed increased compressive, splitting tensile and flexural strengths of HPC samples for a 10% RHA content mix, recording the highest compressive strength in all curing ages. As the curing ages increase, the microstructure of the samples with RHA becomes denser than the control due to the refinement of the microstructure by the RHA incorporated. The XRD and SEM/EDX confirmed the lower calcium hydroxides from pozzolanic reactivity and later formation of C–S–H. The results suggest that RHA can be used as a cement replacement for up to 10% in HPC to produce sustainable concrete.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | High-performance concrete Rice husk ash Superabsorbent polymers Internal curing Microstructure and mechanical properties |
| Subjects: | Q Science > Q Science (General) T Technology > TH Building construction |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment |
| Depositing User: | AKINWUMI |
| Date Deposited: | 23 Sep 2022 14:32 |
| Last Modified: | 23 Sep 2022 14:32 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/16194 |
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