Research into effect of complex nanomodifiers on the strength of fine-grained concrete
DOI:
https://doi.org/10.15587/1729-4061.2018.127261Keywords:
fine-grained concrete, micelles, surface-active substances, nanofiller, nanomodifier, strengthAbstract
We studied the effect of nanomodifiers, which consist of a mixture of a surface-active substance that creates micelles, and mineral modifying admixtures. A special feature of present research is studying a simultaneous effect of surface-active substances that create micelles, and mineral modifying admixtures, on a change in the strength of fine-grained concretes.
The modifying admixtures that are most widely used at present are microsilica and metakaolin. They have, however, certain disadvantages. The shortcomings of microsilica include a lack of stability in its properties as it represents the industrial waste. Metakaolin is rather costly because of high energy costs for its production. That is why we employed microsilica, lime, gypsum, and natural kaolin as the modifying admixtures in this research.
It was established in the course of our study it that the use of nanomodifiers, which consist of micelles solutions and mineral modifying admixtures, strengthens the rate of formation and the magnitude of strength of fine-grained concretes. The results of research showed that the processes of strength formation of concrete, when using gypsum or lime as a modifying admixture, speed up by 1.5–2 times at the initial period of its hardening (3 days). Subsequently, the rate of concrete strength formation, when it has a nanomodifier based on lime or gypsum, continues to exceed the rate of formation of strength of the concrete, which contains only MSAS, and concrete without additives. At the age of 28 days the nanomodified concrete demonstrates strength that is 70‒110 % larger than the strength of concrete without additives.
Thus, it was proved that in order to control processes of cement setting and strength formation of an artificial stone, which is obtained in the process of cement hydration, it is possible to use the micellar catalysis. Applying the micelles filled with modifying admixtures increases the absolute magnitude of compressive strength of fine-grained concretes.
The results obtained make it possible to reduce consumption of Portland cement when manufacturing fine-grained concretes, or to significantly reduce the time needed to fabricate monolithic structures from the specified concretes.
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