Performance of rice husk ash blended cementitious systems with added superplasticizers

Msinjili, Nsesheye Susan; Schmidt, Wolfram; Rogge, Andreas; Kühne, Hans‐Carsten

doi:10.1016/j.cemconcomp.2017.07.014

Cited by 35 publications

(6 citation statements)

References 13 publications

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“…A reasonable adjustment allows to significantly reduce the overall Portland cement clinker content without performanceloss. Finally, SCC with RHA was possible by using a combination of lignosulphonate plasticizer and cassava starch as rheology modifying admixtures [ 53 , 54 ].…”

Section: Previous Studies On the Use Of Rha As Scmmentioning

confidence: 99%

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

et al. 2020

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Supplementary cementitious materials (SCM) can reduce the total amount of Portland cement clinker in concrete production. Rice husk ashes (RHA) can be converted from an agricultural by-product to a high-performance concrete constituent due to a high amount of reactive silica with pozzolanic properties if they are burnt under controlled conditions. The way and duration of combustion, the cooling process as well as the temperature have an effect on the silica form and thus, the chemical and physical performance of the RHA. Various studies on the best combustion technique have been published to investigate the ideal combustion techniques. Yet, the process mostly took place under laboratory conditions. Investigating the difference between the performance of RHA produced in a rural environment and laboratory conditions is useful for the assessment and future enhancement of RHA production, and its application both as building material, for example in rural areas where it is sourced in large quantities, and as additive for high performance concrete. Thus, the paper presents a comparison between RHA produced under rudimentary conditions in a self-made furnace in the rural Bagamoyo, Tanzania and under controlled laboratory conditions at the Technical University of Munich, Germany, with different combustion methods and temperatures. In a second step, RHA was ground to reach particle size distributions comparable to cement. In a third step, cement pastes were prepared with 10%, 20% and 40% of cement replacement, and compared to the performance of plain and fly ash blended cement pastes. The results show that controlled burning conditions around 650 °C lead to high reactivity of silica and, therefore, to good performance as SCM. However, also the RHA burnt under less controlled conditions in the field provided reasonably good properties, if the process took place with proper burning parameters and adequate grinding. The knowledge can be implemented in the field to improve the final RHA performance as SCM in concrete.

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Section: Previous Studies On the Use Of Rha As Scmmentioning

confidence: 99%

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

et al. 2020

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“…Therefore, using bio-based materials as pozzolanic cement replacement is more important in Africa than in other regions in the world, and the continent has a tremendous potential for further development of the agricultural harvest. Some notable research demonstrates the use of ashes of rice husk, sugar cane straw and groundnut husks as pozzolan in concrete [19][20][21][22][23][24][25][26][27][28], other studies looked at bagasse, cassava peels, bamboo leaves, groundnut shells, or locust bean tree fruits [25,26,[29][30][31][32].…”

Section: Alternative Cement and Concrete Materials Solution Requireme...mentioning

confidence: 99%

Optimised processes for the production of performance concrete constituents based on agricultural wastes

Schmidt

Olonade

2023

IOP Conf. Ser.: Earth Environ. Sci.

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In most parts of the world urban populations are growing. This inevitably requires resources for construction materials, which is a challenge to achieving global climate goals. Since there is no alternative to concrete as structural material, novel approaches are required to use cement in concrete more efficiently and to use as little Portland cement clinker in the binder for concrete. With novel approaches, Africa can spearhead green urban construction technologies globally, as the continent’s carbon emissions re marginal today in comparison to the rest of the world and the potential to use local resources are enormous. The authors of the paper develop conclusions on how bio-waste can be converted to organic and mineral concrete constituents that have a potential to create rural livelihoods and urban construction materials markets. A three-step solution including a hydrothermal process, a pyrolysis step and a co-fuelling process with brick production in a vertical shaft kiln is suggested to derive organic components, various by-products as well as bricks and pozzolanic cement replacements, respectively.

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“…Rice husk ash (RHA), obtained after combustion treatment, can be about 90% SiO 2 and has high volcanic ash properties [ 92 ]. RHA is used as a cement replacement for concrete because of its high SiO 2 content and volcanic ash effect [ 93 , 94 , 95 ]. It has been found that RHA can reduce chloride ion penetration in concrete [ 20 ].…”

Section: Chloride Penetration Resistancementioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

Лю

Lü

et al. 2022

Materials

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With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and broadening the scope of applications of recycled concrete. This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion penetration, acid resistance, and freeze–thaw resistance of concrete. The results show that the content of old mortar and the quality of recycled concrete are closely related to the durability of prepared RFA concrete. For example, the drying shrinkage value with a 100% RFA replacement rate is twice that of normal concrete, and the depth of carbonation increases by approximately 110%. Moreover, the durability of RFA concrete decreases as the RFA replacement rate and the water–cement ratio improve. Fortunately, the use of zeolite materials such as fly ash, silica fume, and meta kaolin as surface coatings for RFAs or as external admixtures for RFA concrete had a positive effect on durability. Furthermore, the proper mixing methods and/or recycled aggregates with optimized moisture content can further improve the durability of RFA concrete.

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Performance of rice husk ash blended cementitious systems with added superplasticizers

Cited by 35 publications

References 13 publications

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

Optimised processes for the production of performance concrete constituents based on agricultural wastes

The Durability of Recycled Fine Aggregate Concrete: A Review

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