Usage of supplementary cementitious materials: advantages and limitations
- PDF / 1,965,093 Bytes
- 23 Pages / 595.276 x 790.866 pts Page_size
- 76 Downloads / 337 Views
Usage of supplementary cementitious materials: advantages and limitations Part I. C–S–H, C–A–S–H and other products formed in different binding mixtures Barbara Pacewska1 · Iwona Wilińska1 Received: 18 December 2019 / Accepted: 5 June 2020 © The Author(s) 2020
Abstract It is well known that cement production is not neutral for natural environment among others due to high CO2 emission. Different strategies of mitigation of negative environmental impact of its production are developed. One of the ways is utilization of supplementary cementitious materials (SCMs) in the manufacture of cement and concrete. Introduction of aluminosilicate SCMs into binding mixture makes that more amount of so-called C–A–S–H phase appears in hydration products, affecting microstructure and properties of final hardened composite. The aim of this work is to discuss the possibilities of utilization of selected SCMs in different binding mixtures including some advantages and limitations. Literature review on the subject was carried out. Some of our own research results were also presented. In the Part I of this review, some information about history of ancient binding materials and the possibilities of inspiring modern engineers with ancient constructions in the aspect of using SCMs in modern concrete were presented. Using pozzolanic aluminosilicate SCMs in relation to their influence on formed products, microstructure and mechanical properties of hardened material were discussed. Some problems with possibilities of study of SCMs reaction degree were identified. Emphasis was put on the usefulness of isothermal calorimetry and thermal analysis for investigations of hydration process and identification of hydrated products as well as evaluation of degree of reaction of SCMs. Keywords Supplementary cementitious materials · Cement · Blended cement · Pozzolana · Hydration · Thermal analysis
Introduction Cement and cement concrete are common construction materials manufactured in large amounts. The demand for cement has been increasing for many years which is an effect of global urbanization. For example, during the decade between 2004 and 2014 above 90% increase in worldwide cement production was observed. After 2014, some stagnation in cement manufacture takes place [1]. In 2017, the cement world production was above 4 Gt/year [1, 2]; however, further growth is expected in the coming years. China
* Iwona Wilińska [email protected] 1
Faculty of Civil Engineering, Mechanics and Petrochemistry, Institute of Chemistry, Warsaw University of Technology, 17 Łukasiewicza St., 09‑400 Plock, Poland
produced and consumed the most amount of cement; it is above 50% of total worldwide production [1–4]. Unfortunately, production of cement clinker is not neutral for environment as it consumes large amount of energy and natural resources and causes emission of CO2 which is estimated as 5–8% of the annual worldwide CO2 emissions from anthropogenic sources [3–7] (about 842 kg C O2 per tonne of clinker [3, 8], 600–700 kg CO2 per tonne of ceme
Data Loading...
