Studies on effects of burning conditions and rice husk ash (RHA) blending amount on the mechanical behavior of cement

Bie, Rushan; Song, Xingfei; Liu, Qianqian; Ji, Xiaoyu; Chen, Pei

doi:10.1016/j.cemconcomp.2014.09.008

Cited by 164 publications

(64 citation statements)

References 16 publications

(12 reference statements)

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“…The surface area range (5-35 m²/g) is entirely consistent with some reports in the literature [3,7] but is substantially lower than others; Liou [16], reported surface areas of up to 185-235 m²/g while Bie et al [17] reported surface areas of 27-86 m²/g. These two specific examples are important because they are from low carbon ashes and so the effect of carbon is controlled for.…”

Section: Surface Areasupporting

confidence: 79%

“…In both these studies the higher temperature runs produced the lower surface area RHA. Indeed Bie et al [17] reported surface areas of 27 m²/g for husk combusted at 700°C for 1 hour and 86 m²/g for husk combusted at 600°C for one hour; the LOI for each sample was 1.5 and 3.2 wt% respectively. This would suggest that carbon content may not be the overriding factor and that ash adhesion is more important.…”

Section: Surface Areamentioning

confidence: 99%

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Valorisation of rice husks using a TORBED® combustion process

Blissett¹,

Sommerville

Rowson

et al. 2017

Fuel Processing Technology

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World production of rice exceeds 750 million tonnes per year of which a fifth is removed in the form of rice husk during the milling process. The use of rice husks as a source of sustainable and renewable energy is often hindered by lack of capital and a poor understanding of rice husk combustion characteristics. This results in the selection of poor quality technology which generates significant quantities of harmful crystalline silica waste. Despite previous work in the area, detailed characterisation of the combustion of rice husk ash in a TORBED reactor across a wide temperature range has not yet been attempted and little effort has been directed towards assessing the economic viability of generating quality rice husk ashes. The use of a TORBED reactor enables low residual carbon after combustion without the generation of harmful crystalline material. Rice husk was combusted in a 400mm reactor at temperatures between 700-950°C. In the subsequent characterisation studies the resulting materials were shown to be fully amorphous high purity silica (> 95%) and were readily digested in a series of alkaline digestion experiments. Complete silica conversion was only possible using uneconomic Na2O/SiO2 ratios and further optimisation of the combustion process to generate higher surface area material is necessary to increase the digestion rates further. Provisional economic analysis suggests that sales of the by-product enhance the returns from rice husk based power generation. TORBED reactors enable the combustion of rice husk with considerable operating flexibility and they generate products that could be used to displace resource intensive products and processes thus, added value from the by-products can be obtained by using TORBED reactor technology.

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Section: Surface Areasupporting

confidence: 79%

Section: Surface Areamentioning

confidence: 99%

Valorisation of rice husks using a TORBED® combustion process

Blissett¹,

Sommerville

Rowson

et al. 2017

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…But also our own previous research results (without publishing) indicate that, in rice husk treated with NaOH and calcined at 700 ∘ C, silicon dioxides were organized into a crystalline structure known as cristobalite. Due to the fact that the rice husk specific surface area increases when silica in the ash is amorphous [31,32], the presence of cristobalite could explain the decrease in specific surface area in RHc700 sample. Figure 2 shows SEM microphotographs of RHw, RHc, and RHc300 samples.…”

Section: Samples Characterizationmentioning

confidence: 99%

Removal of Cd (II) from Aqueous Media by Adsorption onto Chemically and Thermally Treated Rice Husk

Hoyos-Sánchez

Córdoba-Pacheco

Rodríguez-Herrera

et al. 2017

Journal of Chemistry

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Chemically and thermally treated rice husks were evaluated as a potential decontaminant of toxic Cd (II) in aqueous media. Rice husk (RH), a by-product from rice milling, was chemically treated with HCl and NaOH. Then, thermal treatments to 300, 500, and 700∘ C were applied. The chemical composition and morphological characteristics of RH were evaluated by different techniques. The specific surface area analysis of RH samples by BET nitrogen adsorption method provided specific surface areas ranging from 6 to 14 m 2 /g. SEM, FTIR, and EDX analyses of RH were carried out to determine the surface morphology, functional groups involved in metal binding mechanism, and C/O and C/Si ratios, respectively. The maximum Cd (II) adsorption capacity was 28.27 mg/g at an optimum pH, 6.0. The kinetic studies revealed that adsorption process followed the pseudo-second-order kinetic model.

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“…Rice husk being disposed and burned in open spaces due to zero commercial value, hence inviting serious environmental problems [8]. In certain country, rice husk was recycled as boiler fuel to generate electricity and steam but contribute about 20% of ash after incineration process [9]. With the proper preparations, rice husks can be processed to be ash and being used as pozzolans and filler in many construction application [10].…”

Section: Rice Huskmentioning

confidence: 99%

“…Recently, many researchers have studied the utilization of rice husk ash as pozzolans and filler in construction material [7,[11][12][13][14][15][16][17][18][19][20][21]. Bie et al [11] conducted a research regarding the mechanical behavior of cement mortar containing RHA burned at different burning conditions in muffle furnace. Cement mortar samples sized of 40 × 40 ×160 mm were prepared by replaced 0%, 5%, 10% and 20% of cement with RHA to obtain their compressive and flexural strength.…”

Section: Rice Huskmentioning

confidence: 99%

Compressive Strength of Construction Materials Containing Agricultural Crop Wastes: A Review

Ibrahim

Ghani

et al. 2017

MATEC Web Conf.

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Abstract. The growth of industrialization and development of urban life made an increase in demand for cement, concrete and bricks. Exploitation on the non-renewable natural resources for raw materials will keep increased in order to meet the demands for construction materials. At the same time, the problems regarding the agricultural crop wastes such as rice husk, sugarcane bagasse, palm oil fuel waste and elephant grass has become an important issue nowadays. Consequently, there are many researchers who have been studying the viability of using these agricultural wastes as construction materials to meet the industry demands in order to decrease the current use of non-renewable natural resources. This paper reviewing on how agricultural waste could be utilized as replacement materials for construction activities from various researchers. The idea of using agricultural crop wastes was promoted by studying upon their engineering properties. This paper focusing on the compressive strength of the construction materials containing agricultural crop wastes, which was the common parameter considered by most researcher as required by various standards.

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Studies on effects of burning conditions and rice husk ash (RHA) blending amount on the mechanical behavior of cement

Cited by 164 publications

References 16 publications

Valorisation of rice husks using a TORBED® combustion process

Valorisation of rice husks using a TORBED® combustion process

Removal of Cd (II) from Aqueous Media by Adsorption onto Chemically and Thermally Treated Rice Husk

Compressive Strength of Construction Materials Containing Agricultural Crop Wastes: A Review

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