Utilization of Cordia Africana wood sawdust ash as partial cement replacement in C 25 concrete

Meko, Bikila; Ighalo, Joshua O.

doi:10.1016/j.clema.2021.100012

Cited by 22 publications

(6 citation statements)

References 30 publications

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“…Regarding the measured expansion, all pastes manufactured with by-products as SCMs indicated values similar to those of Type IV cement, ranging between 1 mm and 2 mm. These increases in the setting time and slight expansions, attributed to the addition of biomass combustion ash [43,74,[81][82][83] and CDW powdered material [43,[84][85][86], have been reported in the literature and align with the results obtained in the laboratory in this study.…”

Section: Setting Time and Volumetric Expansionsupporting

confidence: 91%

Feasibility of Using New Sustainable Mineral Additions for the Manufacture of Eco-Cements

Moreno,

Rosales,

Rosales

et al. 2024

Materials

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Due to a continuously developing population, our consumption of one of the most widely used building materials, concrete, has increased. The production of concrete involves the use of cement whose production is one of the main sources of CO2 emissions; therefore, a challenge for today’s society is to move towards a circular economy and develop building materials with a reduced environmental footprint. This study evaluates the possibility of using new sustainable supplementary cementitious materials (SCMs) from waste such as recycled concrete aggregates (RCAs) and mixed recycled aggregates (MRAs) from construction and demolition waste, as well as bottom ash from olive biomass (BBA-OL) and eucalyptus biomass ash (BBA-EU) derived from the production of electricity. A micronisation pre-treatment was carried out by mechanical methods to achieve a suitable fineness and increase the SCMs’ specific surface area. Subsequently, an advanced characterisation of the new SCMs was carried out, and the acquired properties of the new cements manufactured with 25% cement substitution in the new SCMs were analysed in terms of pozzolanicity, mechanical behaviour, expansion and setting time tests. The results obtained demonstrate the feasibility of using these materials, which present a composition with potentially reactive hydraulic or pozzolanic elements, as well as the physical properties (fineness and grain size) that are ideal for SCMs. This implies the development of new eco-cements with suitable properties for possible use in the construction industry while reducing CO2 emissions and the industry’s carbon footprint.

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Section: Setting Time and Volumetric Expansionsupporting

confidence: 91%

Feasibility of Using New Sustainable Mineral Additions for the Manufacture of Eco-Cements

Moreno,

Rosales,

Rosales

et al. 2024

Materials

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“…The decrease in compressive strength with an increase in agro-waste content can be attributed due to the water absorption by RHA [8,19], SD, and CNS [17]. The decrease in compressive strength with the increase in agro-waste beyond 10% was also observed by previous researchers [8,17,19,20].…”

Section: Compressive Strength Testsupporting

confidence: 75%

Characteristic study on concrete elements using agro-waste as a replacement of fine aggregate

T M,

Someshb

2023

Res. Eng. Struct. Mater.

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Concrete is the predominant material that is commonly used for all construction engineering practices and the demand for concrete ingredients has increased nowadays. Utilization of agricultural waste helps in meeting the demand and the present study focused on replacement of fine aggregate with agro-waste. Agrowastes such as Rice Husk Ash, Saw Dust, and Coconut Shell powder were utilized as a replacement for fine aggregate. An experimental investigation was carried out on concrete specimens with varying proportions of 2%, 4%, 6%, and 8% of agro-waste to the weight of fine aggregate. Agro-waste was equally proportioned for the replaced weight of fine aggregate. Agro-waste concrete was compared with conventional concrete (100% -M sand) for the improvement in mechanical properties by examining the results of compressive strength test and split tensile strength test. Also, the performance of concrete specimens was also determined by non-destructive testing. The optimization of the concrete mix for the addition of agro-waste was obtained based on the strength characteristics. The effectiveness of utilizing agricultural waste in concrete with rebars was studied using the chloride ingress test and Open Circuit Potential test. The experimental findings show that 2 to 4% of agro-waste can be utilized efficiently as fine aggregate replacement.

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“…This finding suggests that the workability of FM mixtures diminishes as the proportion of SDA increases, and that this condition becomes more pronounced with higher levels of cement replacement. A previous study on C25 concrete indicated a decrease in the workability of the mixtures when there was a partial replacement of cement with wood sawdust ash [40]. The decline in workability can be attributed to the hygroscopic nature of the substance, resulting in a fast uptake of moisture from the base mix [58].…”

Section: Workabilitymentioning

confidence: 95%

“…The experiment was conducted on the concrete surface area that was in direct contact with water, as illustrated in Figure 4c. Subsequently, the FM specimens were extracted from the container and assessed for mass gain at various time intervals (10,20,30,40,50, and 60 min) by weighing them. We computed the volume of water ingested by dividing the mass gained by the nominal surface area of the specimen and by the density of water.…”

Section: Transport Propertiesmentioning

confidence: 99%

“…Nevertheless, the investigation determined that due to its propensity to induce fluctuations and reductions in strength, the concrete was unsuitable for structural applications. Bikila et al [40] employed dosages of up to 100%, with increments of 25%, in a comparable endeavor to partially substitute sand. The sand's homogeneity and curvature coefficients were measured to be 1.049 and 1.324, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

Majeed

2024

Sustainability

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Utilizing sawdust efficiently to produce construction materials can help safeguard the environment and decrease costs by minimizing the need for traditional resources and reducing carbon dioxide (CO2) emissions. Additionally, recycling sawdust plays an essential role in creating a sustainable ecosystem. Hence, this study aimed to examine the potential use of sawdust ash (SDA) as a partial cement replacement on foamed mortar (FM) properties, including its fresh, mechanical, transport, thermal, and microstructural properties. A variety of FM mixtures were tested for workability, density, consistency, intrinsic air permeability, porosity, split tensile strength, compressive strength, flexural strength, and thermal conductivity by replacing cement with SDA at varying percentages of 0%, 10%, 20%, 30%, 40%, and 50%. The results revealed that FM’s workability was reduced by the introduction of SDA with a higher percentage cement replacement, while the density of the FM mixtures was reduced due to SDA’s specific gravity being lower than that of cement. A linear improvement was observed in the air permeability, sorptivity, and porosity of FM–SDA composites with an increased SDA percentage to 20%. It is notable that these properties started to deteriorate once the cement replacement by SDA surpassed 30%. A noticeable improvement of mechanical strength properties of the FM was found at 20% of SDA content, but they deteriorated when the SDA content was more than 30%. FM blends with higher SDA contents exhibited larger and more apparent voids, according to SEM analysis. In conclusion, incorporating sawdust into formulations emerges as a viable method for FM production. This approach not only mitigates the environmental impact of sawdust disposal but also reduces the need for extracting natural resources in construction material manufacturing.

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Utilization of Cordia Africana wood sawdust ash as partial cement replacement in C 25 concrete

Cited by 22 publications

References 30 publications

Feasibility of Using New Sustainable Mineral Additions for the Manufacture of Eco-Cements

Feasibility of Using New Sustainable Mineral Additions for the Manufacture of Eco-Cements

Characteristic study on concrete elements using agro-waste as a replacement of fine aggregate

Formulating Eco-Friendly Foamed Mortar by Incorporating Sawdust Ash as a Partial Cement Replacement

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