The impact of using rice husk ash as a replacement material in concrete: An experimental study

Al-Alwan, Asad A. Khedheyer; Al-Bazoon, Mustafa; Mussa, Faten I.; Alalwan, Hayder A.; Mohammed, Malik M.; Mohammed, Mohammed Fakhri

doi:10.1016/j.jksues.2022.03.002

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…Since this study incorporates RHA with high fineness, the higher surface area of particles absorbs more water making the mix more cohesive and less workable. These observations are in good agreement with several other findings in the literature [73]. The information related to the obtained slump values is given in Table 5.…”

Section: Slump Values Of Fresh Concretesupporting

confidence: 92%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates, respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of pozzolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.

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Section: Slump Values Of Fresh Concretesupporting

confidence: 92%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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“…An increase in the w/c ratio increases the pores of the concrete. The pores reduced the strength and penetration rate of the chloride ion structure [10]. High Strength concrete made from a mixture of 20% RHA and 5% olive waste ash produces a flexural strength of 13.2 MPa [11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Ahmad

Pertiwi

Taufieq

2023

IOP Conf. Ser.: Earth Environ. Sci.

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A flat slab is widely used as an alternative form of a house roof. The roof work does not take long. Its simple structure is beautiful to homeowners with a minimalist concept. Because this slab does not use a roof covering, it is very susceptible to the influence of the sea. Damage often occurs. Acid rain causes the concrete to become porous as slab material. This investigation aims to produce a durable roof slab to solve existing problems. The test object used was a reinforced concrete slab of 30cmx60cmx15cm. Three types of compressive strength were used, namely 20 MPa, 30 MPa, and 35 MPa. At the same time, the green concrete concept is used by replacing some of the cement with rice husk ash. The effect of acid rain was carried out by immersing the specimens in an acid solution for 28 days, 90 days, and 120 days. All samples were tested for flexural strength for their mechanical properties and XRD for microstructural properties. The results show that the roof slab with rice husk ash can reduce the damage that occurs due to the influence of acid. At the same time, gypsum and calcium oxide content can show the phenomenon of slab damage.

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“…The addition of RHA as reinforcement is not only limited to the alloys. Al-Alwan et al [ 43 ] recently used RHA as a partial replacement of the ordinary Portland cement in the concrete. They reported a 9%, 11%, and 4% increase in the flexure, compression, and tensile strength of the concrete, respectively.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Microstructural and Mechanical Properties of Novel Ternary Reinforced AA7075 Hybrid Metal Matrix Composite

et al. 2022

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This study investigates the comparison of the microstructural and mechanical properties of a novel ternary reinforced AA7075 hybrid metal matrix composite. Four samples, including AA7075 (base alloy), AA7075-5wt %SiC (MMC), AA7075-5wt %SiC-3wt %RHA (s-HMMC), and AA7075-5wt %SiC-3wt %RHA-1wt %CES (n-HMMC) were developed using the stir casting liquid metallurgy route, followed by the heat treatment. The experimental densities corresponded with the theoretical values, confirming the successful fabrication of the samples. A minimum density of 2714 kg/m3 was recorded for the n-HMMC. In addition, the highest porosity of 3.11% was found for n-HMMC. Furthermore, an increase of 24.4% in ultimate tensile strength and 32.8% in hardness of the n-HMMC was recorded compared to the base alloy. However, its ductility and impact strength was compromised with the lower values of 5.98% and 1.5 J, respectively. This was confirmed by microstructural analysis, which reveals that n-HMMC has mixing issues and forms agglomerates in the matrix, which served as the potential sites of stress concentration leading to low impact strength and ductility. Nevertheless, the hybrid composites showed superior mechanical properties over the MMC and its base alloy.

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The impact of using rice husk ash as a replacement material in concrete: An experimental study

Cited by 18 publications

References 20 publications

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Mechanical and Microstructural Properties of Green Roof Slab Under Acid Rain Attack

Investigating the Microstructural and Mechanical Properties of Novel Ternary Reinforced AA7075 Hybrid Metal Matrix Composite

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