The reaction between rice husk ash and Ca(OH)2 solution and the nature of its product

Yu, Qijun; Sawayama, Kazuki; Sugita, Shuichi; Shoya, Masami; Isojima, Y

doi:10.1016/s0008-8846(98)00172-0

Cited by 198 publications

(69 citation statements)

References 3 publications

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“…RHA enhances the mechanical properties of concrete due to the reaction of SiO 2 with Ca(OH) 2 during the hydration process to form additional calcium silicate hydrate (CSH) gel. Yu et al (1999) confirmed that the amorphous silica in RHA concrete, at a temperature of 40 °C and in the presence of water, reacts with Ca(OH) 2 to form CSH gel.…”

Section: Introductionmentioning

confidence: 52%

Enhancement of the mechanical properties of lightweight oil palm shell concrete using rice husk ash and manufactured sand

Foong

Alengaram

Jumaat

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:This study explores the use of rice husk ash (RHA) and manufactured sand (M-sand) as replacements for cement and fine aggregate, respectively, in lightweight oil palm shell concrete (OPSC). In the first stage of this study, the effect of various cement replacement levels, with RHA (5%, 10%, 15%, and 20%) and 100% sand replacement with M-sand and quarry dust (QD), on the compressive strength of OPSC was investigated. The results showed that the highest compressive strength of OPSC of about 51.49 MPa was achieved with the use of 15% RHA and M-sand. In the second stage of the work, the variables of RHA (0 and 15%) and M-sand (0, 50%, and 100%) were used to investigate their combined effects on the mechanical properties of OPSC. It was found that the combination of 15% RHA and 100% M-sand gave the best performance of OPSC in terms of mechanical properties, such as compressive, splitting tensile, flexural strength, and Young's modulus.

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Section: Introductionmentioning

confidence: 52%

Enhancement of the mechanical properties of lightweight oil palm shell concrete using rice husk ash and manufactured sand

Foong

Alengaram

Jumaat

et al. 2015

J. Zhejiang Univ. Sci. A

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“…The incorporation of mineral admixtures in cement-based materials results in chemical and physical effects of interrelated nature. The pozzolanic reaction can be understood in chemical terms as a dissolution-precipitation mechanism, yielding reaction products smaller in size than the original admixture and cement particles [16]. Therefore, besides the decreased alkalinity of the matrix by the Ca(OH) 2 consumption in the pozzolanic reaction, the finer un-reacted particles as well as the reaction products fill the pores in matrix and at interfaces, reducing the composite's overall porosity and permeability, leading to improved strength and lower susceptibility to the deterioration.…”

Section: Mineral Admixtures In Cellulose-cement Compositesmentioning

confidence: 99%

“…On the other hand, durable composites were also obtained when produced with a Ca(OH) 2 -free matrix. This was achieved by means of high replacement rates of cement by mineral admixtures [15][16][17].…”

Section: Mineral Admixtures In Cellulose-cement Compositesmentioning

confidence: 99%

“…Considering the pozzolanic reaction as a dissolution precipitation mechanism [16], RHA-II results in more reaction products filling the pores in the composite matrix. Once CP15-II presents lower matrix porosity than CP30-I, it indicates that the higher reactivity of RHA-II is not only due to its high silica content, but also reflects further improvements resulting from the controlled burning.…”

Section: Composites' Mechanical Propertiesmentioning

confidence: 99%

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Rice Husk Ash as a Supplementary Raw Material for the Production of Cellulose–Cement Composites with Improved Performance

Rodrigues

Ghavami

Stroeven

2010

Waste Biomass Valor

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Rice husk is an agricultural by-product worldwide in large quantities available. This is a suitable biomass source for energy production. Compared to other agricultural by-products, the burned rice husk presents a high yield of ash (about 20%) mainly composed of silica that will be mostly amorphous when properly incinerated. Extensive research in the past three decades has allowed the introduction of rice husk ash (RHA) as a supplementary raw material in cement-based products, whereby significant improvements in strength and durability can be achieved, also contributing to ecological demands. This paper investigates the influences of two RHA admixtures on the physical and mechanical properties of bamboo-pulp-reinforced cement composites. These fibers suffer early degradation in the alkaline environment. RHA blending will reduce the ordinary Portland cement (OPC) content and can improve strength and density due to more effective particle packing, and significantly diminish alkalinity. The composites were produced in the laboratory by a method resembling the Hatschek process used by the fibrocement industry, with fixed reinforcement content and varying amounts of RHA. The results revealed that partial replacement of ordinary Portland cement by up to 30% of RHA had not impaired the mechanical behavior of the composites. Further, use of low-carbon-content RHA decreased porosity in the matrix and enhanced interfacial bonding of the composites. Since the deterioration of cellulose-cement composites is closely related to moisture movement and alkalinity, it is concluded that introduction of low-carbon content RHA can lead to improved durability performance of these composites.

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“…En el primero, ensayo de Fratini (EN 196-5) [6], se determina la capacidad de las bentonitas calcinadas de reaccionar con el CH proveniente de la hidratación del cemento Portland. En los otros dos, reactividad con cal [7] y conductividad eléctrica [12,13], se realiza la adición de las bentonitas calcinadas en solución saturada de hidróxido de calcio (CH) permitiendo determinar su total reactividad. Las absorciones alrededor de los 3620 cm -1 corresponden al estiramiento del grupo OH de la Montmorillonita [11].…”

Section: Materiales Y Metodologíaunclassified

Activación térmica de bentonitas para su utilización como puzolanas

Tironi

Trezza

Irassar

et al. 2012

Revista de la Construcción

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The reaction between rice husk ash and Ca(OH)2 solution and the nature of its product

Cited by 198 publications

References 3 publications

Enhancement of the mechanical properties of lightweight oil palm shell concrete using rice husk ash and manufactured sand

Enhancement of the mechanical properties of lightweight oil palm shell concrete using rice husk ash and manufactured sand

Rice Husk Ash as a Supplementary Raw Material for the Production of Cellulose–Cement Composites with Improved Performance

Activación térmica de bentonitas para su utilización como puzolanas

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