Incidence of recycled aggregates and ternary cements on the compressive strength and durability of ecological mortars

Bedoya, Mónica; Tobón, Jorge Iván

doi:10.1016/j.cscm.2022.e01192

Cited by 7 publications

(5 citation statements)

References 49 publications

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“…In addition, fossil fuels, such as coal, are commonly used as a source of heat in cement kilns, further contributing to CO2 emissions. It is estimated that the production of one ton of Ordinary Portland cement (OPC) releases about 0.8 tons of carbon dioxide making it a significant contributor to climate change (1)(2)(3)(4)(5)(6)(7). The global increase in CO2 emission and the associated impact on global warming motivated studies seeking to investigate the suitability of certain materials for partial or complete replacements of ordinary Portland cement (OPC) as concrete binders (7,8).…”

Section: Introductionmentioning

confidence: 99%

“…It is estimated that the production of one ton of Ordinary Portland cement (OPC) releases about 0.8 tons of carbon dioxide making it a significant contributor to climate change (1)(2)(3)(4)(5)(6)(7). The global increase in CO2 emission and the associated impact on global warming motivated studies seeking to investigate the suitability of certain materials for partial or complete replacements of ordinary Portland cement (OPC) as concrete binders (7,8). Currently, with the construction projects worldwide developing, plenty of natural materials such as natural sand (RS) are used to produce concrete (9,10).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Strength, Durability and Micro Structural Characteristics of Slag-Based Cement Mortar

Deepak,

Ramalinga Reddy,

Nagendra

2024

IJE

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Cement mortar is used as a bonding agent between building materials in the construction of stone masonry and brick masonry. The focus on reducing the environmental burden caused by the high emission of carbon with the consumption of cement has gained interest. In this study, experimental investigations are conducted using two slag-based materials, i.e., Portland Slag Cement (PSC) and Processed Granulated Blast Furnace Slag Sand (PGBFS, iron slag), as a replacement for Ordinary Portland Cement (OPC) and River Sand (RS). The paper aims to investigate the influence of PSC with slag sand on the strength, durability, and microstructure of cement mortar. The present work specifically investigates the strength improvement of cement mortar with slag cement and slag sand by varying the curing period, comparing the results at 7, 14, and 28 days of curing. OPC is replaced fully with PSC, and River sand is replaced partially or fully with slag sand in different percentages, i.e., 0%, 20%, 40%, 60%, 80% and 100% for different types of mixes. Results showed the highest increase in compressive strength and high resistance to acid attack in cement mortar with 100% PSC and 60% Slag Sand replacement. The consumption of proposed materials will benefit the construction industry to achieve the net zero target.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Strength, Durability and Micro Structural Characteristics of Slag-Based Cement Mortar

Deepak,

Ramalinga Reddy,

Nagendra

2024

IJE

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“…Therefore, the different treatments in the RCA reduce the percentage of water absorption, minimizing the error associated with moisture adjustment and, in turn, improving mechanical and durability performance. The use of treatments from chemical, thermal and mechanical processes has been reported to improve the quality of RCA, which can be classified into two main groups: the first group focuses on weakening the residual bonded cement paste in RCA by heating/grinding [17][18][19], crushing with a jaw or ball mill [20][21][22], cleaning/scrubbing [23,24] or even soaking (acid) [25][26][27][28]; the second group focuses on strengthening the microstructure and surface of the RCA by using CO 2 curing [29][30][31][32][33][34], biodeposition [35][36][37], coating (silica fume, fly ash, blast furnace slang) [38][39][40][41][42] and soaking (acid solution) [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Carbonation Behavior of Mortar Made from Treated Recycled Aggregates: Influence of Diammonium Phosphate

et al. 2023

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This research aims to improve the quality of recycled concrete fine aggregates (RFA) by using diammonium hydrogen phosphate (DAP). We aimed to understand the effect of DAP treatment on durability performance due to the carbonation action of mortars with the partial and total substitution of treated RFA. The results showed a maximum reduction in the RFA water absorption of up to 33% using a minimum DAP concentration due to a pore refinement as a consequence of the formation of calcium phosphates such as hydroxyapatite (HAP). The carbonation phenomenon did not have a significant effect on the durability of mortars with DAP-treated RFA, as we did not find a decrease in the compressive strength; the carbonation depth of the mortars with 100% treated RFA decreased up to 90% and 63% for a w/c of 0.45 and 0.50, in comparison with mortars with 0% treated RFA. An inversely proportional relationship was found between the accelerate carbonation and the compressive strength, showing that higher percentages of treated RFAs in the mortar promoted an increase in compressive strength and a decrease in the carbonation rate, which is behavior associated with a lower permeability of the cement matrix as one of the consequences of the microstructural densification by DAP treatment.

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“…The optimum way to utilize these RFA features to create highquality concrete with the same or less cement content is still unknown, and no rules or recommendations are in place. As a reason, RFA's widespread use and best application in new concrete are hindered 17) . Contrary to its behavior in virgin aggregate concrete, the effect of 30% coal fly ash on RAC yielded subpar results when compared to RAC built wholly of OPC.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of a strong link between the fresh cement paste and the aggregate is facilitated by the coarse texture and significant porosity of recycled concrete aggregate, enabling the infiltration into the aggregate matrix. The presence of limited ettringite was found which aids in the development of cracks in hardened concrete as a consequence of its expansive behavior during the hydration process 27) . The EDS results of concrete prepared with RCA and fly ash and RCA/coal bottom ash demonstrate that the amount of calcium/silicate ratio is increased after 120 days of curing as compared to the 28day cured samples.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Mechanical and Microstructural Characteristics of Recycled Concrete Hollow Blocks: Transforming Waste into Valuable Resources

Shekhar,

Godihal

2023

Evergreen

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India has experienced rapid urbanization in recent years, which has increased housing demand and construction activity. This has caused a rise in the use of natural resources and has resulted in a variety of potential pollution. Concrete should be made with additional cementitious materials, such as coal bottom ash (CA) and recycled aggregates, to combat this problem and prevent the earth's surface from degrading. This paper investigates the feasibility of using recycled coarse and fine concrete aggregates (RCA, RCFA) and coal bottom ash to create two different cavity blocks that meet mechanical properties as per American and Indian standards. Percentage variation strength has been illustrated for replacing solely with natural coarse material and combining recycled fine and coarse aggregate. Scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDX) examination of the materials used in preparing concrete for this study has been conducted to ascertain the variance in attributes of various concrete. The study's outcome says that fine aggregate rather than coarse aggregates plays a significant role in achieving good mechanical strength. Natural aggregates and cement can be supplemented with recycled aggregates up to 90% and coal bottom ash up to 45% respectively in making hollow masonry units and can be used in building envelope as per both American and Indian construction practices. Recycled concrete hollow block's good workability and stability have been hampered by the presence of a surplus of calcium and potassium, a deficiency of silica, built-in fractures in the recycled aggregates, and unburned carbon in coal bottom ash.

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Incidence of recycled aggregates and ternary cements on the compressive strength and durability of ecological mortars

Cited by 7 publications

References 49 publications

Experimental Investigation on Strength, Durability and Micro Structural Characteristics of Slag-Based Cement Mortar

Experimental Investigation on Strength, Durability and Micro Structural Characteristics of Slag-Based Cement Mortar

Carbonation Behavior of Mortar Made from Treated Recycled Aggregates: Influence of Diammonium Phosphate

Exploring the Mechanical and Microstructural Characteristics of Recycled Concrete Hollow Blocks: Transforming Waste into Valuable Resources

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