Cement-Based Materials Modified with Nanoscale Additives

Abstract

The most common and reliable material without which modern construction is indispensable is concrete. The development of construction production is pushing for new solutions to improve the quality of concrete mix and concrete. The most demanded and significant indicators of a concrete mixture are the compressive strength and mobility of the concrete mixture. Every year, the volume of research on nanomaterials as modifying components of concrete is significantly increasing, and the results indicate the prospects for their use. Nanoparticles with a large specific surface are distinguished by chemical activity, can accelerate hydration and increase strength characteristics due to nucleation and subsequent formation of C–S–H and compaction of the material microstructure. Sol of nanosilica, which can be used instead of microsilica from industrial enterprises, and carbon nanomaterial have a wide reproduction base. This paper presents studies of these types of nanomaterials and the results of their application in cement concrete. Studies have shown that the effect is also observed with the introduction of an additive containing only one type of nanoparticles. The dependence of the obtained characteristics of cement concretes on the content of these nanomaterials has been established. It has been found that the best results were obtained with an additive in which the above-mentioned nanomaterials were used together. Compressive strength of heavy concrete samples, improved by the complex nanodispersed system, was 78.7 MPa, which exceeds the strength of the sample containing the CNT additive in a pair with a super-plasticizer by 37 %. The paper proposes the mechanism for action of the presented complex additive.

Comparative Study on the Applicability of Non-Metallic Nanofibers and Reed Fibers in Concrete

“…First, we compared the experimental data on dry-wet cycles in the literature. The data showed that non-metallic nanofiber concrete has a strong ability to maintain performance under dry-wet cycles without any noticeable cracks or damage [7]. Second, we compared fatigue test data from the literature.…”

Результаты Применения Взаимодополняющих Методов Оценки Экспериментального Тяжелого Бетона

“…Строительные науки / Construction Sciences З аводы железобетонных изделий работают в условиях рыночной конкуренции и вынуждены искать варианты сокращения издержек в производстве бетонной смеси и готовой продукции. Многие исследовательские задачи направлены именно на оптимизацию составов бетонных смесей при обеспечении наперед заданных характеристик готового материала [1][2][3], что обеспечивается разработкой модифицированных цементных бетонов с минеральными добавками природного, искусственного, техногенного происхождения [4][5][6][7][8][9], введением добавок-пластификаторов [10][11][12][13][14] или комплексных добавок [15][16][17][18][19][20][21][22][23], а также подбором оптимального зернового (гранулометрического) состава [24]. Одним из направлений снижения себестоимости является совершенствование составов бетонных смесей и пересмотр норм расхода материалов, что не противоречит действующим нормативным документам.…”

Multi-Parameter Methodology for Assessing Quality Indicators of Nanomodified Fiber-Reinforced Concrete for Construction Site

“…The stress intensity factor is one of the most important indicators of the crack resistance of a material such as fiber-reinforced concrete [1][2][3], since the ability of fiber-reinforced concrete to prevent crack development is the main advantage over conventional concrete [4][5][6][7]. For this reason, methods for determining this indicator should most fully disclose all the features of work under load and the quality of nanomodified fiber-reinforced concrete [8][9][10].…”