Limestone Portland Cement
Crushed limestone is interground with clinker to produce cement, reducing the needs for clinker-making and calcination. The addition of up to 5% limestone has shown to have no negative impacts on the performance of Portland cement, while optimized limestone cement would improve the workability slightly.
In India it was shown that the addition of alkali bicarbonate substantially reduces the potential for the alkali-aggregate reaction that takes place when alkali (NaOH) is formed in the cement. The potential expansion when using an alkali carbonate and bicarbonate in low porosity systems was measured using a highly reactive aggregate (crushed pyrex glass) according to the procedure outlined in A.S.T.M. C-227. The results demonstrated a reduced expansion of a low porosity mortar prepared with NaHCO3 when compared to an equivalent Na2CO3 system.
Development Status | Products |
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Commercial |
Limestone Portland CementCosts & Benefits
Parent Process: Blended Cement Alternatives | |
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Energy Savings Potential |
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CO2 Emission Reduction Potential |
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Costs | Capital costs for extra storage capacity for the other main constituents and the new cements as well as the technical equipment for handling and drying of these constituents may be € 8-12 million. |
Limestone Portland Cement Publications
Development of State of the Art Techniques in Cement Manufacturing: Trying to Look Ahead
The report represents the independent research efforts of the European Cement Research Academy (ECRA) to identify, describe and evaluate technologies which may contribute to increase energy efficiency and to reduce greenhouse gas emissions from global cement production today as well as in the medium and long-term future.