Open AccessUse of clay from a local source for calcination and subsequent preparation of the mixed cement
Author(s) -
B Smirova,
Martin Sedlačík,
Radoslav Novotný
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1205/1/012005
Subject(s) - calcination , pozzolan , pozzolanic activity , cementitious , materials science , cement , portland cement , clinker (cement) , pozzolanic reaction , mineralogy , composite material , chemistry , biochemistry , catalysis
This paper deals with the use of calcinated clay and micronized limestone as supplementary cementitious materials (SMCs) for preparation of blended Portland cement CEM II/B-M (Q-LL). Clay used in this study was calcinated at 700°C and pozzolanic activity after calcination was assessed using accelerated R3 pozzolanic test and modified Chapelle test. The influence of calcinated clay and limestone addition on mechanical properties and hydration process was investigated and an optimal ratio for 35% clinker replacement was found. Initial decrease of mechanical strength at early ages, caused by SCM addition, was almost compensated during maturation of the binder.