Hydration and phase formation of blended cementitious systems incorporating chemically transformed rice husk ash

Prasittisopin, Lapyote; Trejo, David

doi:10.1016/j.cemconcomp.2015.03.002

Cited by 42 publications

(13 citation statements)

References 24 publications

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“…RHA, an agricultural by-product [14][15][16] generally burned in open space, is regarded as the source of air pollution [17,18],because it is regarded as a waste product and proper disposal of such kind of waste is a serious concern as 120 million tons of rice husk is thrown away or burned annually [19][20][21]. RHA contains about 85% of amorphous silica which can be employed as cement substituting material [22][23][24][25] because of its pozzolanic property, and thus environmental pollution can be minimized to some extent [26][27][28][29]. Various research investigations were carried out on concrete blended with 0%-20% of RHA as cementitious material 10%-15% of RHA provides the highest compressive strength of concrete [30].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Bheel

Awoyera

Shar

et al. 2021

Advances in Civil Engineering

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Over the last decade, there has been a surge in research into possible cement substitute materials in concrete that are environmentally friendly, cost-effective, and socially beneficial. The alternatives include industrial and agricultural wastes, and their potential advantages can be achieved through recycling, repurposing, and renewing processes. With the use of these wastes as additional and replacement materials, significant energy savings and a reduction in cement use can be achieved, which helps to reduce carbon dioxide (CO2) emissions in the environment. Therefore, the use of rice husk ash (RHA) and wheat straw ash (WSA) as ternary cementitious material (TCM) in concrete can help reduce the impact on the environment and minimize the use of Portland cement (PC) in the concrete mixture. This research work is performed on the concrete blended with 0%, 5%, 10%, 15%, and 20% of RHA and WSA as TCM in the mixture. However, the purpose of this experimental work is to investigate the influence of RHA and WSA as TCM on the fresh (slump), physical (water absorption and density), and hardened properties (compressive strength, splitting tensile strength, and flexural strength) and drying shrinkage of concrete. In this regard, a total of 240 concrete samples (cylinders, cubes, and beams) were prepared with 1 : 2 : 4 mix proportions at 0.50 water-cement ratio and cured at 7 and 28 days, respectively. Moreover, the workability of green concrete is getting reduced as the quantity of TCM increases in the mixture. Besides, the compressive strength, splitting tensile strength, and flexural strength are enhanced by 12.65%, 9.40%, and 9.46% at 10% of TCM (5% RHA and 5% WSA) on 28 days consistently. Furthermore, the density and water absorption of concrete are reduced with the increase in the dosages of TCM on 28 days, respectively. In addition, the drying shrinkage is reduced with the increase in the quantity of TCM in concrete.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Bheel

Awoyera

Shar

et al. 2021

Advances in Civil Engineering

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“…Inhibitory index, I I < 10 Low inhibition [13] Table 2 The experimental conditions used for the manufacturing of WRCC panels.…”

Section: Parametermentioning

confidence: 99%

“…Residues such as wood wastes, agricultural residues, fast growing tree, low-grade wood species and non-woody materials were used significantly as materials for production of wood-based composites by many researches around the world i.e., sugarcane bagasse [4,5], arhar stalks [6], date palm midrib [7], flax [8], shell of babaçu [9], vegetable fibers [10], vine stalks [11], wheat straw [12], and rice husk ash [13].…”

Section: Introductionmentioning

confidence: 99%

Use of tree pruning wastes for manufacturing of wood reinforced cement composites

Nasser

Salem

Al-Mefarrej

et al. 2016

Cement and Concrete Composites

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“…Table 3 summarises the effects of the replacement of y ash in cementitious systems on the concentrations of hydroxyl, aluminate, silicate, and calcium ions in solutions at early ages. Regarding the ion concentration studies for extended mixing processes, replacing cement with y ash can lead to (1) decreased hydroxyl ion concentration due to less cement contents, (2) increased aluminate ion concentration due to a formation of aluminate-rich gel layers, (3) increased silicate ion concentration due to more silicon from y ash in cementitious systems, and (4) decreased calcium ion concentration due to lime precipitation and less cement content [29,30]. The effect of mixing time on normalised owability of the control, 20%, and 50% y ash systems mixed at 285 rpm is shown in Fig.…”

Section: Ion Concentrationmentioning

confidence: 99%

Extended mixing processes on early- and later-age of cement systems incorporating fly ash

Sereewatthanawut

Panwisawas

Ngamkhanong

et al. 2022

Preprint

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Specifications that correlate with system performance can “ensure” continual values being added. Most specifications for ready-mixed concrete address limits on discharge time and truck-drum revolution counts. These limits have been developed for conventional concrete. As the uses of supplementary cementing materials (SCMs) become ubiquitous, it is important to determine whether these specifications are applicable to SCMs, that is, systems containing fly ash. This paper reports results of the effects of mixing time and mixer revolution counts on characteristics of lab-made pastes and mortars. The characteristics assessed include time-variant ion concentrations, setting time, flow, compressive strength, porosity, and apparent chloride diffusivity coefficient. Results indicate that with increasing mixing time and mixer revolution counts, mixtures with a replacement of fly ash exhibit improved fresh and hardened characteristics. Fly ash is suggested to adopt in the extended mixing processes of cement systems.

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Hydration and phase formation of blended cementitious systems incorporating chemically transformed rice husk ash

Cited by 42 publications

References 24 publications

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Mechanical Properties of Concrete Incorporating Rice Husk Ash and Wheat Straw Ash as Ternary Cementitious Material

Use of tree pruning wastes for manufacturing of wood reinforced cement composites

Extended mixing processes on early- and later-age of cement systems incorporating fly ash

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