Influence of water to cement ratio on CO2 uptake capacity of belite-rich cement upon exposure to carbonation curing

Siddique, Salman; Naqi, Ali; Jang, Jeong Gook

doi:10.1016/j.cemconcomp.2020.103616

Cited by 105 publications

(26 citation statements)

References 52 publications

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“…At 27 d of carbonation curing, 80% of the cross-sectional area of the OPC samples was carbonated. The carbonation degrees of the OPC samples were similar to those reported in previous works [ 19 , 44 ]. Blended samples with limestone and metakaolin showed much higher rates of carbonation degree than OPC samples at all ages.…”

Section: Resultssupporting

confidence: 87%

“…TGA curves of the samples are shown in Figure 6 . The W-series samples showed weight loss humps at around 100 °C and a shoulder around 140 °C due to the dehydration of chemically attached water from C-S-H, ettringite, and AFm phases [ 16 , 44 , 49 , 50 ]. It is reported that the weight loss hump at around 140–160 °C is mainly associated with the presence of monocarboaluminates and hemicarboalumiates [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…The representative strength value was averaged from three replicas. The carbonation degree of the samples was measured by spraying a 1% phenolphthalein indicator onto the cross-section of the carbonated prisms [ 19 , 44 ]. The carbonation degree for the L-, M-, and H-series samples was determined immediately after carbonation curing, i.e., after 6 h, 13 d, and 27 d of carbonation for L-, M-, and H-series samples, respectively.…”

Section: Experimental Programmentioning

confidence: 99%

“…In addition, carbonation degree of the samples at 3 and 7 d of carbonation was additionally provided to observe the progressive carbonation degree. The carbonation degree was determined by Equation (1) [ 19 , 44 ]. The pH value of pore solution in the samples was measured using a suspension made with powdered sample and deionized water.…”

Section: Experimental Programmentioning

confidence: 99%

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CO2 Uptake and Physicochemical Properties of Carbonation-Cured Ternary Blend Portland Cement–Metakaolin–Limestone Pastes

et al. 2020

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The feasibility of carbonation curing of ternary blend Portland cement–metakaolin–limestone was investigated. Portland cement was substituted by the combination of metakaolin and limestone at levels of 15%, 30%, and 45% by the mass. The ternary blends were cured with four different combinations of ambient and carbonation curing. The mechanical property, CO2 uptake, and mineralogical variations of the ternary blend pastes were investigated by means of compressive strength test, thermogravimetric analysis, and X-ray diffractometry. In addition, volume of permeable voids and sorptivity of the ternary blends were also presented to provide a fundamental idea of the pore characteristics of the blends. The test results showed that the increasing amount of metakaolin and limestone enhanced the CO2 uptake, reaching 20.7% for the sample with a 45% cement replacement level at 27 d of carbonation. Meanwhile, the compressive strength of the samples was reduced up to 65% upon excessive incorporation of metakaolin and limestone. The samples with a replacement level of 15% exhibited a comparable strength and volume of permeable voids to those of the sample without substitution, proving that the ternary blend Portland cement–metakaolin–limestone can be a viable option toward the development of eco-friendly binders.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

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CO2 Uptake and Physicochemical Properties of Carbonation-Cured Ternary Blend Portland Cement–Metakaolin–Limestone Pastes

et al. 2020

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“…Despite a similar reaction mechanism, the hydration reaction of C 2 S results in lower production of calcium hydroxide (CH) and heat as compared to C 3 S (see Equations ( 3) and ( 4)). Carbonation of fresh state C 2 S and C 3 S results in an accelerated curing process and is governed by the reactions (see Equations ( 5) and ( 6)) [17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Characteristics of Calcium Sulfoaluminate Cement Exposed to Early-Age Carbonation Curing

et al. 2021

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: The early-age carbonation curing technique is an effective way to improve the performance of cement-based materials and reduce their carbon footprint. This work investigates the early mechanical properties and microstructure of calcium sulfoaluminate (CSA) cement specimens under early-age carbonation curing, considering five factors: briquetting pressure, water–binder (w/b) ratio, starting point of carbonation curing, carbonation curing time, and carbonation curing pressure. The carbonization process and performance enhancement mechanism of CSA cement are analyzed by mercury intrusion porosimetry (MIP), thermogravimetry and derivative thermogravimetry (TG-DTG) analysis, X-ray diffraction (XRD), and scanning electron microscope (SEM). The results show that early-age carbonation curing can accelerate the hardening speed of CSA cement paste, reduce the cumulative porosity of the cement paste, refine the pore diameter distribution, and make the pore diameter distribution more uniform, thus greatly improving the early compressive strength of the paste. The most favorable w/b ratio for the carbonization reaction of CSA cement paste is between 0.15 and 0.2; the most suitable carbonation curing starting time point is 4 h after initial hydration; the carbonation curing pressure should be between 3 and 4 bar; and the most appropriate time for carbonation curing is between 6 and 12 h.

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Damage Constitutive Modeling of Backfills with Different Cement–Tailing Ratios Using Energy Method

Zhao

Yang

et al. 2022

Geotech Geol Eng

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Influence of water to cement ratio on CO2 uptake capacity of belite-rich cement upon exposure to carbonation curing

Cited by 105 publications

References 52 publications

CO2 Uptake and Physicochemical Properties of Carbonation-Cured Ternary Blend Portland Cement–Metakaolin–Limestone Pastes

CO2 Uptake and Physicochemical Properties of Carbonation-Cured Ternary Blend Portland Cement–Metakaolin–Limestone Pastes

Mechanical and Microstructural Characteristics of Calcium Sulfoaluminate Cement Exposed to Early-Age Carbonation Curing

Damage Constitutive Modeling of Backfills with Different Cement–Tailing Ratios Using Energy Method

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