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Open AccessArticle

A New, Carbon-Negative Precipitated Calcium Carbonate Admixture (PCC-A) for Low Carbon Portland Cements

1
School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK
2
Carbon Capture Machine (UK) Limited, Aberdeen AB10 1YL, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(4), 554; https://doi.org/10.3390/ma12040554
Received: 10 January 2019 / Revised: 8 February 2019 / Accepted: 11 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Testing of Cement-Based Materials)
The production of Portland cement accounts for approximately 7% of global anthropogenic CO2 emissions. Carbon CAPture and CONversion (CAPCON) technology under development by the authors allows for new methods to be developed to offset these emissions. Carbon-negative Precipitated Calcium Carbonate (PCC), produced from CO2 emissions, can be used as a means of offsetting the carbon footprint of cement production while potentially providing benefits to cement hydration, workability, durability and strength. In this paper, we present preliminary test results obtained for the mechanical and chemical properties of a new class of PCC blended Portland cements. These initial findings have shown that these cements behave differently from commonly used Portland cement and Portland limestone cement, which have been well documented to improve workability and the rate of hydration. The strength of blended Portland cements incorporating carbon-negative PCC Admixture (PCC-A) has been found to exceed that of the reference baseline—Ordinary Portland Cement (OPC). The reduction of the cement clinker factor, when using carbon-negative PCC-A, and the observed increase in compressive strength and the associated reduction in member size can reduce the carbon footprint of blended Portland cements by more than 25%. View Full-Text
Keywords: CO2 emissions; carbon CAPture and CONversion (CAPCON); Precipitated Calcium Carbonate (PCC); limestone; strength; rheology; XRD analysis; Life Cycle Assessment CO2 emissions; carbon CAPture and CONversion (CAPCON); Precipitated Calcium Carbonate (PCC); limestone; strength; rheology; XRD analysis; Life Cycle Assessment
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MDPI and ACS Style

McDonald, L.; Glasser, F.P.; Imbabi, M.S. A New, Carbon-Negative Precipitated Calcium Carbonate Admixture (PCC-A) for Low Carbon Portland Cements. Materials 2019, 12, 554.

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