The basic properties of concrete can dramatically improve due to the unique structure of the nanosized particles. Namely, strength, frost resistance, fire resistance, corrosion resistance are increased, density and permeability are reduced; plasticity and water absorption are regulated. Despite of the huge number of advantages of nanomodified concrete, analysis of the use of nanoparticles shows that they are used quite seldom, as it requires a large cash outlay. It is not always profitable to use such additives. This article discusses some additives: magnesium nanoshpinel, microspheres, rice hull ash and metakaolin, astralenes, ferric hydroxide sol, carbon nanotubes, silica fume, nanosilica, MB-01, combined modifiers, based on iron hydroxide sol and silica sol. As well in this article sol-gel method as an additive in concrete is considered. The analysis shows that the use of nanosized particles can reduce a large amount of cement. As an addition, savings of the use are seen in reducing the cost of construction due to the low density with high strength. Accurate material consumption and maximum use of advantages of nanomodified concrete provide great prospects of implementation of this material in construction.
In this article the effect of plasticizing and siliceous additives on the fluidity of the concrete mix and strength of concrete is investigated. Additives: superplasticizer S-3, fused microsilica FMS-85, hyperplasticizer PENTAFLOW AC 2, and a mixture of hyperplasticizer and microsilica CM 02-10 (10% MS and 0.2% HP). In this paper presented results of tests of samples aged 3, 7 and 28 days.
There are supplements that could accelerate or slow down the process of setting and formation of the cement stone structure. After examining the effect of these particles, we can predict how they could influence on the growth of concrete strength. It is possible to assess the effect of supplementation activity using the thermo-kinetic method by exothermic effect, which is obtained by wetting and hydration of cement. A calorimetric research of the effect of cement-carbon material was held in this article.
Abstract. The main aim of this research is the investigation of effect of the composite additive (a mixture of hyperplasticizer and microsilica) CM 02-10 (10 % of MS and 0.2 % of HP) on strength characteristics of concrete. Interaction of concrete with plasticizing and siliceous additives individually depending on their percentage content by the weight of cement is also investigated. Results of experiments with such additives on the fluidity of concrete mix and strength of concrete are presented. Additives used in the experiment: superplasticizer S-3, fused microsilica FMS-85, hyperplasticizer PENTAFLOW AC 2, and composite additive CM 02-10. In this paper results of tests of samples aged 3, 7 and 28 days are presented.
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