Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

Nikolai Lyubomirskiy,Stanisław Fic,Aleksandr Bakhtin,Tamara Bakhtinа,Małgorzata Szafraniec

doi:10.3390/ma13102304

Nikolai Lyubomirskiy, Stanisław Fic + Show 3 more

Open Access

https://doi.org/10.3390/ma13102304

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Abstract

The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO2. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO2 concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO2 content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO2 concentration in the gas-air mixtures used for carbonate curing is 30%–40%.

Highlights

The global environmental problems of climate change as a result of human impacts on nature have been firmly established as the most internationally discussed issues (Conference of Parties (COPs) in Warsaw (COP-19 in 2013), in Lima (COP-20 in 2014), in Paris (COP-21 in 2015), and most recently in Marrakech (COP-22 in November of 2016)
If the dynamic method of carbonation, the most influencing factors can be called the factors for obtaining the testing samples, i.e. pressure pressing (z2 ) and lime dust content (z3 ), in the static method, along with the main factor z2, the factors responsible directly for the process of carbonation curing, such as the concentration of CO2 (z1 ) and carbonation time (z4 ), become more decisive
The essence of the combined method is to create a preliminary discharge in the carbonation chamber; the subsequent supply of carbon dioxide gas and air mixture and further carbonation in a static mode, maintaining a constant concentration of CO2 in the carbonation chamber is within 30%–40%

Summary

Introduction

The global environmental problems of climate change as a result of human impacts on nature have been firmly established as the most internationally discussed issues (Conference of Parties (COPs) in Warsaw (COP-19 in 2013), in Lima (COP-20 in 2014), in Paris (COP-21 in 2015), and most recently in Marrakech (COP-22 in November of 2016). One of the branches of industry that emits a significant amount of anthropogenic CO2 into the atmosphere is the construction materials industry, which is in second place after the energy sector in terms of global CO2 emissions. The production of Portland cement and other binders alone accounts for up to 8% of the world’s anthropogenic CO2 emissions [1,2,3,4]. In this sense, CO2 sequestration is one of the most important technical challenges of our time [5].

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