Effects of carbonation pressure and duration on strength evolution of concrete subjected to accelerated carbonation curing

Ahmad, Shamsad; Assaggaf, Rida Alwi; Maslehuddin, Mohammed; Al‐Amoudi, Omar S. Baghabra; Adekunle, Saheed Kolawole; Ali, Syed Imran

doi:10.1016/j.conbuildmat.2017.01.069

Cited by 118 publications

(19 citation statements)

References 13 publications

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“…The second one concerns the CO 2 treatment of cement-based materials in order to accelerate the evolution of the performance e.g. [59][60][61][62][63] including the binders based on special, low hydraulically active clinkers 41,64,65 . Lately, some authors suggested that the recycled concrete fines can be valorized by carbonation for the use in the concrete production 66,67 .…”

Section: Discussionmentioning

confidence: 99%

Carbon Capture and Utilization by mineralization of cement pastes derived from recycled concrete

Skoček

Zając

Haha

2020

Sci Rep

143

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Reduction of co 2 emissions associated with cement production is challenging in view of the increasing cement demand and the fact that major part of the emissions originates from the main raw material used -limestone -which can be only to extremely low amount substituted. A carbon capture and Utilization (CCU) approach based on mineralization of fines derived from concrete appears to be a viable alternative to reduce these emissions. the co 2 sequestration and the reactivity of the obtained carbonated recycled fines is experimentally demonstrated for lab as well as industrial materials for different mineralization conditions. It is shown that all CO 2 originally released by limestone calcination during clinker production can be sequestered by the full carbonation of the fines within a short time. Upon full carbonation, gels with pozzolanic properties form in the fines irrespective of the conditions tested. The carbonated fines have specific CO 2 savings more than 30% higher than the simple clinker replacement by limestone.Global urbanization and economic development increase demand for new buildings and infrastructure and hence for concrete. Already now, concrete is the second most used substance by mass after water. Even though concrete has low specific CO 2 emissions below 150 kg CO2,eq /ton concrete 1 , its abundance makes it responsible for 5-8% of man-made CO 2 emissions 1-4 . Most of the concrete's emissions result from production of the main cement component, the clinker. Hence, focus of researchers as well as of cement producers has been on lowering the clinker content in cements and on improving the efficiency of clinker production. As summarized in 1 , both these approaches have already reached their potentials in mature economics. Almost all suitable Supplementary Cementitious Materials (SCMs) available are already used in cement and concrete production. For the clinker production, further energy efficiency improvements would have only a minor effect as the energy consumption approaches the lowest theoretical value and is often driven by additional objectives such as alternative fuels usage rate.Nevertheless, the cement industry needs to drastically reduce its emissions and at the same time satisfy the increasing cement demand of the global economy 5 . At the level of concrete structures and concrete applications, several approaches can bring considerable CO 2 savings. These include re-usable structures with extended service life or concretes with reduced cement contents 3,6 . At the level of cement production, extended use of calcined clays and limestone as SCM are the only approaches applicable at large enough scale. With the ongoing departure from coal-fired power plants and decreasing demand for pig iron in mature markets, the availability of blast furnace slags and fly ashes is expected to decrease. Calcined clays and limestone have the potential to replace these SCMs in the current market as well as provide sufficient volumes of SCMs in growing markets. However, clinker replacement by limestone o...

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Section: Discussionmentioning

confidence: 99%

Carbon Capture and Utilization by mineralization of cement pastes derived from recycled concrete

Skoček

Zając

Haha

2020

Sci Rep

143

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“…The dynamics of the strength set of testing samples is lower than in the dynamic method, however, the absolute values of the strength values under similar varying conditions are higher, and the dynamics of the strength set itself tends to further increase, both with increasing forming pressure of pressing samples and with increasing concentration of CO 2 in the gas and air mixture fed into the carbonation chamber. This phenomenon shows that the acceleration of the lime carbonation reaction by actively seeping CO 2 through the samples, simulated in the experiment as a dynamic mode of carbonation, firstly, leads to a sharp formation of a large amount of water in the system, which clogs and closes the pores in the material, and complicates the diffusion of CO 2 in the pores of the material, and secondly, it can create conditions for the emergence in the system of aggressive carbon dioxide and the beginning of the dissolution and corrosion of calcite crystals of the newly formed carbonate structure [23,29,[35][36][37]. Estimating the obtained ES samples of forced carbonate hardening of samples on the basis of lime dust and limestone, it can be concluded that the most appropriate way to carry out the accelerated carbonation of materials based on lime, may be a combined method of artificial carbonation, which consists in creating a pre-discharge in the carbonation chamber, the subsequent supply of gas and air mixture of CO 2 and further conducting the process in a static mode, maintaining a given concentration of CO 2 .…”

Section: Discussionmentioning

confidence: 99%

Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

et al. 2020

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The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO2. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO2 concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO2 content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO2 concentration in the gas-air mixtures used for carbonate curing is 30%–40%.

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“…Several other researchers used a flue gas to enhance the environmental impact of carbonation, however, the degree of reaction was lesser [67,95,96]. Higher pressures of up to 5 bars were also employed [70,84,85,[97][98][99]. Although some promising results were reported when carbonation was utilized at higher pressure, the applicability and feasibility of adopting pressurized carbonation by the industry are yet to be evaluated.…”

Section: Carbonation Curingmentioning

confidence: 99%

Accelerated Carbonation Curing as a Means of Reducing Carbon Dioxide Emissions

El-Hassan¹

2021

Cement Industry - Optimization, Characterization and Sustainable Application

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Globally, carbon dioxide concentration has immensely increased post the industrial revolution. With more greenhouse gases generated from human activities, more radiation is being absorbed by the Earth's atmosphere, causing an increase in global temperature. The phenomenon is referred to as the greenhouse gas effect. Alone, the cement industry contributes to approximately 5-8% of the global greenhouse gas emissions. Scientists and environmentalists have proposed different scenarios to alleviate such emissions. Among these, accelerated carbonation curing has been advocated as a promising mechanism to permanently sequester carbon dioxide. It has been applied to numerous construction applications, including concrete masonry blocks, concrete paving blocks, ceramic bricks, concrete pipes, and cement-bonded particleboards. Experimental results have shown that not only does it significantly reduce the carbon emissions, it also improves the mechanical and durability properties of carbonated products. The process enhances material performance, offers environmental benefits, and provides an excellent means to recycle carbon dioxide.

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Effects of carbonation pressure and duration on strength evolution of concrete subjected to accelerated carbonation curing

Cited by 118 publications

References 13 publications

Carbon Capture and Utilization by mineralization of cement pastes derived from recycled concrete

Carbon Capture and Utilization by mineralization of cement pastes derived from recycled concrete

Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

Accelerated Carbonation Curing as a Means of Reducing Carbon Dioxide Emissions

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