Reactivity and strength development of CO2 activated non-hydraulic calcium silicates

Bukowski, John M.; Berger, R.L.

doi:10.1016/0008-8846(79)90095-4

Cited by 203 publications

(76 citation statements)

References 9 publications

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“…These structures have varying sensitivity to temperature (Goto, Suenaga, Kado, & Fukuhara, 1995). The influence of pressure on the extent of the reaction and the uniformity of the reaction across the samples has been noticed (Bukowski & Berger, 1979). This paper characterizes the pore structure of reacted natural wollastonite paste and investigates the influence of the extent of reaction on the pore structure development.…”

Section: Introductionmentioning

confidence: 99%

“…Optimized production processes, less carbon-intensive fuel usage, incorporation of recycled materials, and formulation of low-carbon cement are active areas of investigation (Damtoft et al, 2008;Imbabi et al, 2013;Schneider, Romer, Tschudin, & Bolio, 2011). Alternative solutions have also been proposed to capture the emitted CO 2 (Bukowski & Berger, 1979;Imbabi et al, 2013;Klemm & Berger, 1972).…”

Section: Introductionmentioning

confidence: 99%

“…Slurries of the calcium silicates (CS) (wollastonite and pseudowollastonite) were reacted with water and CO 2 to form a mixture of calcium carbonate and amorphous silica. Bukowski and Berger (1979) investigated the potential of carbonating non-hydraulic cement pastes. They hypothesized that when γ-C 2 S and CS were exposed to CO 2 , an exothermic reaction can occur that follows the steps listed below (Bukowski & Berger, 1979 The carbonation process produced compounds that can be classified as poorly crystalline or crystalline.…”

Section: Introductionmentioning

confidence: 99%

“…Bukowski and Berger (1979) investigated the potential of carbonating non-hydraulic cement pastes. They hypothesized that when γ-C 2 S and CS were exposed to CO 2 , an exothermic reaction can occur that follows the steps listed below (Bukowski & Berger, 1979 The carbonation process produced compounds that can be classified as poorly crystalline or crystalline. These structures have varying sensitivity to temperature (Goto, Suenaga, Kado, & Fukuhara, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the Pore Structure of Carbonated Natural Wollastonite

Villani¹,

Spragg²,

Tokpatayeva³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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This paper focuses on examining the pore structure of a cementitious paste made with a calcium silicate (wollastonite) that reacts with carbon dioxide and water to form a hardened solid. The pore structure of the hardened solid has been characterized using vapor sorption and desorption, low-temperature differential scanning calorimetry (LT-DSC), and scanning electron microscopy (SEM). The total porosity was also measured using mass measurement in oven-dry and vacuum-saturated conditions. Evidence exists that support the hypothesis that the solid has two main pore sizes: large macropores (>10 nm) appear to form between the initial calcium silicate particles and small micropores (<10 nm) were found in the reacted silica gel. The bimodal nature of the pore structure was evident from the desorption and LT-DSC responses. The extent of reaction was also investigated and was found to be the result of the function of the raw material particle size: only particles with radius <10 µm were found to have entirely reacted even in highly reacted systems. Moreover, the degree of reaction influenced the uniformity of reaction across the sample. Only the highly reacted system showed a uniform microstructure with continuous reaction products path and low porosity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterizing the Pore Structure of Carbonated Natural Wollastonite

Villani¹,

Spragg²,

Tokpatayeva³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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“…As the carbonation reaction progresses, it becomes possible for the porosities of the carbonated materials to be low enough to block CO 2 gas flowing into the inner zone of the non-carbonated material, thus greatly reducing or completely stopping the carbonation reaction. 16) Figure 8 represents the changes in the pH and specific surface area of carbonated waste cement at various carbonation times. The pH of the carbonated waste cement deceased, reaching a pH of 8 after 24 h of carbonation time.…”

Section: Resultsmentioning

confidence: 99%

Effect of CO<SUB>2</SUB> Carbonation on the Chemical Properties of Waste Cement: CEC and the Heavy Metal Adsorption Ability

et al. 2011

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This study investigated changes in the chemical properties of carbonated waste cement, including the phase transformation, gel polymerization, and specific surface area, as well as cation exchange capacity (CEC) and the adsorption ability of heavy metal ions (Cr 6þ and Cu 2þ ). Highly crystalline calcite and highly polymerized silica gel with a three-dimensional network were found to form in carbonated waste cement. The specific surface area and the CEC of waste cement increased with an increase in the carbonation percentage. In addition was a linear relationship between the specific surface area and the carbonation percentage of the waste cement. When the carbonation percentage of waste cement was 35%, the CEC of the carbonated waste cement reached approximately 22 meq/100 g (The unit of [meq/100 g] is milliequivalent per 100 gram. The unit indicates the concentrations of electrolytes.). The increase of the CEC confirmed that carbonated waste cement could adsorb heavy metals.

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