The industrial production of cement-based and lime-based materials such as mortars contributes significantly to the release of greenhouse gases such as CO2 into the atmosphere. However, a percentage of these emissions is reabsorbed as the mortar hardens, owing to carbonation reactions. This study aims to explore the CO2 sequestration capacity of a cement-based (CM) and a lime-based mortar (LM) over the first 28 days of curing. The CO2 uptake of CM and LM was experimentally evaluated in mildly accelerated conditions by using a volumetric approach. This procedure enabled us to assess the CO2 absorbed after 1, 7 and 28 days from mortar preparation so as to simulate CM and LM behavior during their setting, hardening, and service-life conditions. Through the experimental approach values of 19.1, 25.5 and 26.4 g CO2/kg for CM and 5.0, 11.0 and 16.1 g CO2/kg for LM were obtained. These results, which were validated by means of X-ray diffraction along with calcimetry analysis, confirmed that carbon sequestration by common mortars during their curing time is not negligible.

Evaluation of CO2 Uptake under Mild Accelerated Carbonation Conditions in Cement-Based and Lime-Based Mortars

BALLETTO, GINEVRA
;
NAITZA, STEFANO
;
MAZZELLA, ALESSANDRO
2014-01-01

Abstract

The industrial production of cement-based and lime-based materials such as mortars contributes significantly to the release of greenhouse gases such as CO2 into the atmosphere. However, a percentage of these emissions is reabsorbed as the mortar hardens, owing to carbonation reactions. This study aims to explore the CO2 sequestration capacity of a cement-based (CM) and a lime-based mortar (LM) over the first 28 days of curing. The CO2 uptake of CM and LM was experimentally evaluated in mildly accelerated conditions by using a volumetric approach. This procedure enabled us to assess the CO2 absorbed after 1, 7 and 28 days from mortar preparation so as to simulate CM and LM behavior during their setting, hardening, and service-life conditions. Through the experimental approach values of 19.1, 25.5 and 26.4 g CO2/kg for CM and 5.0, 11.0 and 16.1 g CO2/kg for LM were obtained. These results, which were validated by means of X-ray diffraction along with calcimetry analysis, confirmed that carbon sequestration by common mortars during their curing time is not negligible.
CaCO3; Carbonation; CO2 Uptake
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/84892
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