Abstract
The influence of naphthalene formaldehyde superplasticizers (NFS), lignosulfonate plasticizers (LSP) and silica fume on cement paste properties and complex usage of these admixtures for high-strength concrete production are investigated in this research. These admixtures influence the cement hydration products morphology and properties of hardened cement paste. The degree of cement hydration and Ca(OH)2 content in hardened cement paste were determined for analysis of cement hydration process with admixtures. Mechanical properties and porosity of hardened cement paste with the admixtures were tested. Optimal dosages of plasticizing admixtures and silica fume were estimated and the most efficient method of silica fume adding to concrete mixture was proposed. The results of investigation have been used for high-strength concrete production.
Highlights
The main principle of high-strength concrete production is a considerable decrease of V/C ratio in concrete
The research aim is to determine the influence of complex admixtures, being composed from naphthalene formaldehyde or melamine formaldehyde superplasticizers and lignosulfonates as well as silica fume, on cement mixtures and concretes properties, to investigate properties of such type of concretes and possibilities to use the above-mentioned admixtures in high-strength concrete production
The research results indicate that the optimum quantity of silica fume in cement pastes and concrete with a 0,5 % dosage of naphthalene formaldehyde superplasticizer is 5 % and with a l % dosage of the above-mentioned superplasticizer is 7... 15 % of cement mass
Summary
The main principle of high-strength concrete production is a considerable decrease of V/C ratio in concrete. To produce a high-strength and long-durability concrete, it is important to use effective plasticizing admixtures to decrease water requirement in the concrete and to entrain a sufficient amount of air in case of production of frost resistant concrete. Due to a very active pozzolanic effect silica fume increases concrete strength, due to their great specific surface area, it considerably increases the water demand in concrete mixture [10,11,12,13,14]. The research aim is to determine the influence of complex admixtures, being composed from naphthalene formaldehyde or melamine formaldehyde superplasticizers and lignosulfonates as well as silica fume, on cement mixtures and concretes properties, to investigate properties of such type of concretes and possibilities to use the above-mentioned admixtures in high-strength concrete production
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