Hydrated lime activation on byproducts for eco-friendly production of structural mortars

Kang, Sung-Hoon; Kwon, Yang-Hee; Hong, Seong Hyeon; Chun, Sung-Chul; Moon, Juhyuk

doi:10.1016/j.jclepro.2019.05.313

Cited by 49 publications

(14 citation statements)

References 68 publications

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“…The significance of alternative binders is their reduced environmental impact and sustainable nature. Alternative binders made of wastes have the potential to increase the reuse of solid wastes (Kang et al 2019 ). The OPC-free mortar proposed in this study has the potential to increase the utilization of wastes like FA and PG, thereby reducing problems of dumping.…”

Section: Resultsmentioning

confidence: 99%

“…The study revealed that a combination of 30% lime, 50% FA, 20% ceramic waste powder and 10% anhydrous gypsum developed a strength greater than 25 MPa at 28 days of curing. Kang et al ( 2019 ) attempted to develop an eco-friendly construction material free of ordinary Portland cement (OPC). A combination of 61% GGBS, 26% hydrated lime, 6.5% silica fume and 6.5% rice husk ash developed a strength of more than 30 MPa at 7 days and 50 MPa at 28 days of curing.…”

Section: Introductionmentioning

confidence: 99%

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Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

James¹,

Arthi²,

Balaji³

et al. 2021

Int. J. Environ. Sci. Technol.

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This study investigates the potential of a blended binder formulated from two industrial solid wastes viz. phosphogypsum and fly ash in combination with lime. Three mix proportions of phosphogypsum and fly ash were investigated, and the minimum lime contents required for activation were determined using the Eades and Grim pH test. The lime–fly ash–phosphogypsum blends were then cast into cubes, both in their paste form as well as mortar form, mixed with sand in the ratio of 1:3. They were cured for a period of seven days, and afterwards, their compressive strength was determined. Ordinary Portland cement and lime mortar blocks were also cast as control specimens for comparative evaluation of the strength. The optimal lime–fly ash–phosphogypsum blend was identified and used to construct a masonry prism, and the strengths of the masonry prisms were also evaluated. The optimal lime–fly ash–phosphogypsum blend mortar was also subjected to an X-ray diffraction analysis to determine the reaction products formed during hydration. The study revealed that 5% lime mixed with fly ash:phosphogypsum in the ratio of 3:1 was the optimal proportion which gave the maximum strength to the cubes. The optimal lime–fly ash–phosphogypsum blend mortar developed strength that was higher than conventional Portland cement and lime mortar. The optimal lime–fly ash–phosphogypsum blend mortar masonry prisms developed strength that was comparable to that of Portland cement mortar masonry. The X-ray diffraction analysis revealed the formation of calcium silicate hydrate minerals as well as ettringite and portlandite which were responsible for strength gain.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

James¹,

Arthi²,

Balaji³

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

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“…In addition, lime-based materials are considered philosophically and technically suitable in the field of historic building conservation, compared to Portland cement [22]. Moreover, these materials are eco-friendly due to their low energy consumption and greenhouse gas emissions in the manufacturing process [6,23]. In addition to long-term cost competitiveness, these environmental aspects are also important in preventive conservation.…”

Section: Preventive Conservation Strategy For Historic Masonry Structmentioning

confidence: 99%

“…This has been demonstrated in old historic buildings; while non-hydraulic lime mortars showed 0.5-2.5 MPa of strength in Pišece Castle (Slovenia, 13th century), hydraulic lime mortars showed 8-10 MPa in Gediminas Castle Hill (Lithuania, 13-14th century) and 11-15 MPa in Alhambra Palace (Spain, 13th century) [28,29]. Furthermore, because of recent efforts to reduce greenhouse gases in the field of construction materials [23], NHL is recommended for use as a cementing material more actively in new buildings as well as old ones. In addition to its carbon capture capacity, lime has an excellent self-healing ability (the ability to fill in cracks by forming CaCO 3 ).…”

Section: Suitability Of Natural Hydraulic Lime As a Repair Materials Fmentioning

confidence: 99%

Historical and Scientific Investigations into the Use of Hydraulic Lime in Korea and Preventive Conservation of Historic Masonry Structures

et al. 2019

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In addition to non-hydraulic lime, natural hydraulic lime (NHL) is a material widely used to repair and restore historic buildings. In Korea, although lime mortars have been used as important building materials for thousands of years, the sharing of information and technology with other countries has been relatively inactive. While not recognizing the suitability of NHL as a repair material, undesirable materials such as Portland cement have often been selected due to their high strength, ease of use, and hydraulicity, but unfortunately, this has resulted in the irreversible damage of existing elements, especially in historic masonry structures. This study aims to emphasize the need for hydraulic lime for the sustainable preservation of Korea’s architectural heritage. To justify its use, historical and scientific investigations were conducted. By reviewing literature written in the 15th century, it was found that dark limestone was used to manufacture building lime. Based on this, the chemical compositions of different-colored limestone were experimentally analyzed, and significant evidence was found that dicalcium silicate was formed in the quicklime manufactured by calcining blue-green and green-black limestone. Prior to the 19th century, it would have been impossible to record the chemical compositions of various types of limestone, except for visual observations such as color differences. Fortunately, this important information was recorded in royal documents and has been handed down to the present day. Thus, knowledge from 500 years ago could be scientifically interpreted using the latest technology. The link between the historical record and the experimental results shown in this study can contribute to the selection of a suitable material. This is a method for the preventive preservation of historic masonry structures, as it can significantly lower the possibility of future damages caused by efflorescence and freeze–thaw.

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“…The cement industry is associated with huge amounts of energy consumption and greenhouse gas emissions [1]. It consumes 2%-3% of global energy consumption and is responsible for about 7% of carbon dioxide (CO 2 ) emissions [2], which is mostly attributed to the manufacture of Portland cement, which requires a very high temperature of 1400 • C-1500 • C [3].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of CO2 Uptake and Mechanical Properties of Air Lime-Based Materials

2019

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In the cement industry, utilization of a sustainable binder that has a lower energy consumption and carbon dioxide (CO2) emission than Portland cement is becoming increasingly important. Air lime is a binder that hardens by absorbing CO2 from the atmosphere, and its raw material, hydrated lime, is manufactured at a lower temperature (around 900 °C) than cement (around 1450 °C). In this study, the amount and rate of CO2 uptake by air lime-based materials are quantitatively evaluated under ambient curing conditions of 20 °C, 60% relative humidity, and 0.04% CO2 concentration. In addition, the effects of the water-to-binder ratio (w/b) and silica fume addition on the material properties of the air lime mortar, such as strength, weight change, carbonation depth, and pore structure, are investigated. Unlike hydraulic materials, such as Portland cement, the air lime mortar did not set and harden under a sealed curing condition, however, once exposed to dry air, the mortar began to harden by absorbing CO2. During the first week, most of the internal water evaporated, thus, the mortar weight was greatly reduced. After that, however, both the weight and the compressive strength consistently increased for at least 180 days due to the carbonation reaction. Based on the 91-day properties, replacing 10% of hydrated lime with silica fume improved the compressive and flexural strengths by 27% and 13% respectively, whereas increasing the w/b from 0.4 to 0.6 decreased both strengths by 29% due to the increased volume of the capillary pores. The addition of silica fume and the change in the w/b had no significant impact on the amount of CO2 uptake, but these two factors were effective in accelerating the CO2 uptake rate before 28 days. Lastly, the air lime-based material was evaluated to be capable of recovering half of the emitted CO2 during the manufacture of hydrated lime within 3 months.

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Hydrated lime activation on byproducts for eco-friendly production of structural mortars

Cited by 49 publications

References 68 publications

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

Historical and Scientific Investigations into the Use of Hydraulic Lime in Korea and Preventive Conservation of Historic Masonry Structures

Quantitative Analysis of CO2 Uptake and Mechanical Properties of Air Lime-Based Materials

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