Properties and composition of concrete containing diverse pozzolanic admixtures
2013
Shakhmenko, G., Riga Technical Univ. (Latvia). Faculty of Civil Engineering. Inst. of Materials and Structures | Bajare, D., Riga Technical Univ. (Latvia). Faculty of Civil Engineering. Inst. of Materials and Structures | Juhnevica, I., Riga Technical Univ. (Latvia). Faculty of Material Science and Applied Chemistry. Inst. of Silicate Materials | Toropovs, N., Riga Technical Univ. (Latvia). Faculty of Civil Engineering. Inst. of Materials and Structures | Justs, J., Riga Technical Univ. (Latvia). Faculty of Civil Engineering. Inst. of Materials and Structures | Gabrabe, J., Riga Technical Univ. (Latvia). Faculty of Material Science and Applied Chemistry. Inst. of Silicate Materials
Micro-sized particles are used in modern concrete technology as a part of multi-component cementitious systems. Adding of micro-filler admixtures improves the properties of both fresh and hardened concrete. Local and commercially available micro-fillers were used in this research: dolomite powder, microsilica, calcined local (illite) clay and calcined kaolinite clay. Firstly, the basic micro-filler properties were studied, such as particle size distribution, particle morphology, specific surface and content of reactive components. The second experimental part covered production of fine-grained mixes, sample curing and testing. Compressive strength and water absorption were tested. Mineral formation processes were investigated using X-Ray analysis and IR spectroscopy. As a result, it is concluded that the main factors, which determine the effectiveness of admixture, are pozzolanic reactivity, particle grading and morphology. The most effective fillers in this research were silica fume and calcinated kaolinite clay. Results for dolomite fillers were the same as for the inert fillers. Addition of local calcined illite clay improved tested concrete properties; consequently other locally available clay materials should be investigated more specifically as potential pozzolanic materials in future.
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