Compressed and stabilized soil blocks with fly ash-based alkali-activated cements

Rivera, Jhonathan; Gutiérrez, Ruby Mejía de; Ramírez-Benavides, Sandra; Orobio, Armando

doi:10.1016/j.conbuildmat.2020.120285

Cited by 38 publications

(11 citation statements)

References 26 publications

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“…This granular distribution (low clay percentages) causes pores connected to each other, forming thus a system and allowing the passage of flow between the pores of the brick. Similar results have been observed by other authors, the decrease in thermal conductivity related on the nature and amount of ash added to the mixture [6,7,13,[14][15][16][17][18][19]. The thermal conductivity values of BWBA (5-20%) were below the minimum required by ASTM E2392M-10 [20] it is of the order of 1.2W/mK.…”

Section: Thermal Conductivitysupporting

confidence: 88%

Effect of Wood Biomass Ash on the Mechanical and Thermal Performance of Compressed Earth Bricks

Chelouah,

Boussaa,

Kheloui

2023

ce papers

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This present study investigates the recovery of wood biomass ash (WBA) as chemical stabilize in compacted earth bricks. The specimens were tested for compressive and thermal properties in dry state. The tests were performed at 7 and 28 days of age in order to evaluate the effect of the partial substitution of soil with WBA on the mechanical and thermal properties of the compressed earth bricks. The results indicate that bricks manufactured with 20% of partial substitution showed better performance than those containing only soil. Nevertheless, the use of WBA as source of lime improved the compressive strength and the thermal conductivity of the bricks stabilized with different proportions (5, 10, 15 and 20% wt) when compared with bricks fabricated with 100% soil. This improvement is owing to the pozzolanic reaction produced between the soil components and the WBA as well as the soil microstructure. It was also concluded that the combination of the soil components and lime containing in WBA in the stabilization of compressed earth bricks seems to be a promising alternative when considering issues of energy consumption and pollution.

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Section: Thermal Conductivitysupporting

confidence: 88%

Effect of Wood Biomass Ash on the Mechanical and Thermal Performance of Compressed Earth Bricks

Chelouah,

Boussaa,

Kheloui

2023

ce papers

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“…Rivera et al (2020) used sodium silicate with 30.18% SiO 2 and 14.57% Na2O and a GWP 100 of 0.823 kg CO 2 -eq. (Ecoinvent database v3.6) [ 23 ]. Sodium metasilicate with a GWP of 0.361 kg CO 2 -eq.…”

Section: Gwp Of Materials Used For the Production Of Geopolymer-based...mentioning

confidence: 99%

Minimizing the Global Warming Potential with Geopolymer-Based Insulation Material with Miscanthus Fiber

Witzleben¹

2022

Polymers

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Approximately 45% of global greenhouse gas emissions are caused by the construction and use of buildings. Thermal insulation of buildings in the current context of climate change is a well-known strategy to improve the energy efficiency of buildings. The development of renewable insulation material can overcome the drawbacks of widely used insulation systems based on polystyrene or mineral wool. This study analyzes the sustainability and thermal conductivity of new insulation materials made of Miscanthus x giganteus fibers, foaming agents, and alkali-activated fly ash binder. Life cycle assessments (LCA) are necessary to perform benchmarking of environmental impacts of new formulations of geopolymer-based insulation materials. The global warming potential (GWP) of the product is primarily determined by the main binder component sodium silicate. Sodium silicate’s CO2 emissions depend on local production, transportation, and energy consumption. The results, which have been published during recent years, vary in a wide range from 0.3 kg to 3.3 kg CO2-eq. kg−1. The overall GWP of the insulation system based on Miscanthus fibers, with properties according to current thermal insulation regulations, reaches up to 95% savings of CO2 emissions compared to conventional systems. Carbon neutrality can be achieved through formulations containing raw materials with carbon dioxide emissions and renewable materials with negative GWP, thus balancing CO2 emissions.

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“…In the norm NTE INEN 3066, about concrete blocks, within the requirements and test methods, it has been defined that the concrete blocks must be made with hydraulic cement, fine and coarse aggregates, such as sand, gravel, split stone, volcanic granules, pumice, slags or other suitable inert inorganic materials [27]. The characteristics of the sand (size, shape, granulometric distribution, and texture) must guarantee a uniform mixture preventing the materials from segregating [28], for which the fineness module must be in the range of 2, 3, and 3.1 allowing the processed concrete to be manageable. Therefore, it is fundamental to control the amount of fine aggregate; if the sand is insufficient, the mixture becomes rough, or in the opposite case, when there is more, the mixture has a dry consistency; therefore, more water will be required [29].…”

Section: A Characterization Of Materials Used In the Preparation Of C...mentioning

confidence: 99%

Determination of Compression Stress and Volumetric Weight of Lightened Concrete Blocks, with the Use of Recycled Polymers and Nanoadditives

Gonzagaa¹,

Carrillo²,

Bedón³

et al. 2022

International Journal on Advanced Science, Engineering and Information Technology

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The current study describes the development and evaluation of hollow concrete blocks using recycled polymers and a waterproof, resistance improver nanoadditive together with cement, sand, and pumice to search for an ecological building material capable of reducing the environmental pollution. Three phases were performed; in which the first, we characterized petrous aggregates, polyethylene terephthalate (PET) and the nanoadditive. In the second one, several dosages were established with different percentages of crushed PET that represented to the sand. Additionally, a nanoadditive's part was placed in relation to the total water of the mixture. In the third phase, the compressive stress, volumetric weight, and absorption of the elaborated specimens were determined according to the national standard. The resulting optimal dosage was about 25% PET in replacement of sand + 0.0087 kg of nanoadditive, able to generate a better quality material, obtaining a compressive strength of 36.5 kg/cm 2, very close to the normative (40 kg/cm 2 ) and superior to the of commercial blocks (14.35 kg/cm 2 ). Regarding the volumetric weights, the plastic had a good performance as it managed to reduce the weight by 20%, while the use of the nanoadditive waterproofing decreased by 25% of water absorption. The block of the current research was twice as expensive as the traditional, even if production is tripled, as it was reduced to only $ 0.06 (8%). However, in comparison with the industrially elaborated procedure, the costs are very similar.

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Compressed and stabilized soil blocks with fly ash-based alkali-activated cements

Cited by 38 publications

References 26 publications

Effect of Wood Biomass Ash on the Mechanical and Thermal Performance of Compressed Earth Bricks

Effect of Wood Biomass Ash on the Mechanical and Thermal Performance of Compressed Earth Bricks

Minimizing the Global Warming Potential with Geopolymer-Based Insulation Material with Miscanthus Fiber

Determination of Compression Stress and Volumetric Weight of Lightened Concrete Blocks, with the Use of Recycled Polymers and Nanoadditives

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