Properties of fresh and hardened self-compacting concrete incorporating rice husk ash: A review

Zhang, Peng; Wei, Shiyao; Cui, Guo; Zhu, Yujie; Wang, Juan

doi:10.1515/rams-2022-0050

Cited by 7 publications

(1 citation statement)

References 63 publications

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“…Under uncontrolled burning conditions, the temperature could reach more than 1000 °C due to the intense exothermic oxidation of the rice husk’s organic matter, and the crystallization process is easily achieved, resulting in the formation of cristobalite and tridymite [ 14 , 15 , 16 ]. Regarding the fresh properties, concrete or mortar mixtures containing RHA usually obtain lower slump and fresh and dry density values [ 17 , 18 ]. In the hardened state, mixtures containing RHA have higher compressive strength values and improved durability [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Binary and Ternary Blended Portland Cements Containing Different Types of Rice Husk Ash

Ordoñez,

Borrachero,

Monzó

et al. 2024

Materials

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Rice husk ash (RHA) is agricultural waste with high silica content that has exhibited proven technical feasibility as a pozzolanic material since the 1970s. Notwithstanding, its use in mortars and concrete is limited by the standards currently utilized in some countries where RHA production is high and the aforementioned pozzolanic material is not standardized. This is the case in Spain, one of the main rice producers in Europe. Nowadays, the high pressure placed on the Portland cement production sector to reduce its energy use and CO2 emissions has given rise to a keen interest in mineral admixtures for cement manufacturing. In this research, we intended to establish the contributions of different RHA types to the final blended Portland cement properties (“H” is used to identify RHA in standardized cements). The experimental results demonstrated that RHA with good pozzolanic properties (large specific surface and high amorphous silica content) had to be limited to 10% cement replacement because of the severe reduction in workability at higher replacement percentages. RHA with lower reactivity, such as crystalline RHA, or fly ash (FA) can be used to prepare binary and ternary blended cements with reactive RHA. It is possible to design the following cements: CEM II/A-H and CEM II/A-(H-V). It would also be possible to design cement (CEM II/B-(H-V) with replacement values of up to 30% and the same 28-day mechanical performance as observed for the Portland cement without mineral addition.

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Section: Introductionmentioning

confidence: 99%

Binary and Ternary Blended Portland Cements Containing Different Types of Rice Husk Ash

Ordoñez,

Borrachero,

Monzó

et al. 2024

Materials

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Degradation under cyclic wet-dry aging of full-scale high-workability concrete maximizing sustainable raw materials

Revilla-Cuesta,

Manso-Morato,

Hurtado-Alonso

et al. 2024

Case Studies in Construction Materials

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Enhancing the Strength of Formed Coke from Woody Biomass with the Addition of Biomass Extracts

Okida,

Dohi,

Kudo

et al. 2024

Energy Fuels

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The replacement of coal with lignocellulosic biomass as feedstock for blast furnace coke is a crucial approach to decarbonizing the steel industry, which is a sector that is difficult to abate. Unlike the addition of a small amount of biomass or its charcoal to blended coal for conventional coke, the use of 100% biomass as a raw material is possible with formed coke, while its practical application requires an improvement in strength. Here, we report that the addition of a low-molecular-weight fraction obtained from degradative solvent extraction of biomass, called Soluble, is highly effective in enhancing the strength of the formed coke from softwood biomass. When used alone as a raw material, Soluble foams during carbonization, preventing coke formation. However, when mixed with woody biomass, it disperses within and between biomass particles during pelletization (hot press at 130 °C) or carbonization (cold press). Soluble has a minimal impact on the pyrolysis of biomass and dimensional changes of the biomass-derived carbonaceous substrate during carbonization, but it acts as a binder to sustain the strength of the resulting coke. As a result, the tensile strength of formed coke from biomass alone, which was 1.2 MPa with a cold press and 7.5 MPa with a hot press, improved with the increasing addition of Soluble, reaching around 25 MPa at 30 wt % addition. The effect of addition varied significantly depending on the preparation method and properties of Soluble, particularly highlighting the importance of the resolidification temperature during the carbonization process. This method was also effective for formed coke derived from lower-quality raw materials such as rice husk and lignite compared to softwood, but the optimal addition amount varied due to differences in the Soluble retention capacity.

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Properties of fresh and hardened self-compacting concrete incorporating rice husk ash: A review

Cited by 7 publications

References 63 publications

Binary and Ternary Blended Portland Cements Containing Different Types of Rice Husk Ash

Binary and Ternary Blended Portland Cements Containing Different Types of Rice Husk Ash

Degradation under cyclic wet-dry aging of full-scale high-workability concrete maximizing sustainable raw materials

Enhancing the Strength of Formed Coke from Woody Biomass with the Addition of Biomass Extracts

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