Influences of high-volume coal bottom ash as cement and fine aggregate replacements on strength and heat evolution of eco-friendly high-strength concrete

One way the sustainability and efficiency of concrete production can be improved is by incorporating waste by-products into the mix. This can help reduce the use of natural resources, such as river sand, and prevent the pollution of valuable land. Two specific examples of waste by-products that can be used in the concrete industry are waste glass powder and coal bottom ash. This study presents an experimental investigation that analyzes the influence of adding glass powder and waste bottom ash from 0% to 20% with a 5% interval to produce high-performance mortar for rheological, mechanical, and durability properties cured under different conditions (wet and dry) and temperatures (20 °C), and at several curative processes at 7 and 28 days. The water/cement ratio is a constant 0.35. According to the research findings, blending glass powder and coal bottom ash in the production of mortar results in a significant improvement in performance, particularly in terms compressive and flexural strength (3.4–20.8%) (1.7–20.3%), while employing a 10% WGP and 10% CBA binary blend provides a large increase in the flexural strength (10.6%). In the fire resistance test, 15% WGP and 5% CBA has the maximum bond strength at 200 °C (2.6%). In SEM pictures of WGP and CBA, it is found that the two materials have a low porosity compared to the control cement mortar. Furthermore, the study finds that 10% glass powder and 10% coal bottom ash combined with cement paste is the best percentage of waste by-products to use in the creation of high-performance mortar. This ratio was discovered to be the most successful in terms of increasing mechanical, rheological, and durability qualities.

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“…3. In mortar/concrete, a small proportion of glass powder acting or used as filler helps to reduce the total void in the mortar [66].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…In mortar/concrete, a small proportion of glass powder acting or used as filler helps to reduce the total void in the mortar [66]. By employing CBA as a cement substitute, a 14% reduction in strength was observed when replacing 20% of the cement with CBA without the addition of waste glass powder.…”

mentioning

confidence: 99%

The Implementation of a Binary Blend of Waste Glass Powder and Coal Bottom Ash as a Partial Cement Replacement toward More Sustainable Mortar Production

OLABIMTAN

Mosaberpanah

2023

Sustainability

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“…The optimal amount of pumice was found to be 10 wt.% and 20 wt.%. Chindasiriphan et al 3 investigated concrete made with high volumes of ground and coarse bottom ash. The OPC and sand were substituted with two types of bottom ash: ground and coarse, respectively.…”

Section: Introductionmentioning

confidence: 99%

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Vaičiukynienė,

Nizevičienė,

Kantautas

et al. 2024

Sci Rep

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The production of ordinary Portland cement (OPC) is one of the main global causes of CO2 release to the atmosphere. However, its availability and unique characteristics as a binding material make it difficult to be substituted by eco-friendlier materials. However, OPC partial replacement with pozzolanic materials is one of the best solutions to this problem. Hence, in this study, various types of high-volume zeolite were employed as supplementary cementitious materials (SCM), substituting the OPC by up to 50 wt.% in the composition of the created mortars. Besides, quicklime and inorganic accelerators were included in some of the mortar mixtures to improve the hydration reaction and enhance its speed. The mechanical, durability and durability in sea water properties were investigated. Although the usage of SCM caused a decrease in the mechanical and durability properties of the specimens, the addition of 10 wt.% quicklime palliated this degradation by enhancing by 40% the 28-days compressive strength of the specimens and by significantly improving their durability (porosity, freeze–thaw resistance and carbonation resistance). Moreover, the mixtures were proved to be resistance to aggressive ionic environments, since their compressive strength even increased after 28-day immersion in seawater, due to the additional formation of hydration compounds.

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“…Therefore, the good distribution of internal water in pre-wetted LWAs is designed to solve the issue of external curing, especially at the center of a concrete member. BA is widely used as a fine aggregate, and several studies have reported the effect of internal curing with BA on concrete, alkali-activated concrete, and geopolymers [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, all the studies agreed that BA reduced the compressive strength due to its low density compared to sand and its high porosity, which increases the total porosity of concrete and negatively affects mechanical properties (i.e., compressive strength, splitting strength, and flexural strength).…”

Section: Introductionmentioning

confidence: 99%

“…To date, several studies have attempted to use BA as a cement replacement material with the use of grinding as a pre-treatment to reduce porosity and increase BA density; the pozzolanic reaction can be activated during the curing period. For example, Chindasiriphan et al (2023) [10] studied the effect of BA as a fine aggregate on the strength and heat evolution of high-strength concrete. They indicated that BA reduced the compressive strength and elastic modulus due to it having a lower strength than sand.…”

Section: Introductionmentioning

confidence: 99%

Workability, Mechanical Properties, and Microstructure Analysis of Bottom Ash Mortar Reinforced with Recycled Tire Steel Fiber

Markpiban,

Sahamitmongkol

2023

Buildings

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Recycled tire steel fiber (RTSF) is added to mortar with pre-wetted bottom ash (BA) to enhance the mechanical properties of the mortar, in addition to providing an internal curing effect. This work investigated the mechanical properties of BA mortar, such as the compressive strength, splitting tensile strength, and flexural strength, including the heat of reactions and the total shrinkage, considering different contents of BA (i.e., 10%, 20%, and 30% replacements by volume of fine aggregate) and recycled steel fiber (RSF, i.e., 0.5% and 1.0% by volume). The results showed that BA reduced all mechanical properties; however, it increased the degree of hydration by raising the heat peak of hydration in the first 7 days, increasing the amount of calcium hydroxide at 28 days, and significantly refining the pore structure during the curing period. Regarding the effects of RTSF, the bridging effect positively affected the compressive strength, splitting tensile strength, and flexural strength of the mortar with 30% BA when 1% RTSF was added, increasing them by 25%, 46%, and 40%, respectively. Moreover, adding 1% RTSF reduced the total porosity of the mortar with 30% BA from 17.2% to 14.8%.

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Influences of high-volume coal bottom ash as cement and fine aggregate replacements on strength and heat evolution of eco-friendly high-strength concrete

Cited by 21 publications

References 52 publications

The Implementation of a Binary Blend of Waste Glass Powder and Coal Bottom Ash as a Partial Cement Replacement toward More Sustainable Mortar Production

The Implementation of a Binary Blend of Waste Glass Powder and Coal Bottom Ash as a Partial Cement Replacement toward More Sustainable Mortar Production

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime

Workability, Mechanical Properties, and Microstructure Analysis of Bottom Ash Mortar Reinforced with Recycled Tire Steel Fiber

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