Fine-Grained High-Strength Concrete

Lukutsova, N.P.; Soboleva, G.N.; Golovin, S.N.; Chivikova, E.V.; Ogloblina, E.V.

doi:10.4028/www.scientific.net/MSF.945.131

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HomeMaterials Science ForumFarEastСon - Materials and ConstructionFine-Grained High-Strength Concrete

Fine-Grained High-Strength Concrete

Abstract:

The factors determining the production of fine-grained high-strength concrete are considered. The effect of micro-and complex nanodisperse additives based on natural mineral components, as well as the packing density of the quartz aggregate, on the strength parameters of fine-grained concrete is studied. The compositions of the fine-grained concrete modified by micro-and complex nanodisperse additives have been developed. The dependence of the fine concrete strength on the ratio of the mineral component and the stabilizer in the nanodisperse additive and the time of ultrasonic dispersion and additive storage is analyzed. The stabilization mechanisms of water dispersions of complex nanodisperse additives by various surface active modifiers are considered. The positive role of ultrasonic dispersion in obtaining nanodispersed additives is shown. The application efficiency of the micro-filler improving the density and strength of fine-grained concrete is revealed. The structure of fine-grained concrete is studied. It has been established by scanning electron microscopy that the introduction of the micro-and nanodispersed additives in the concrete leads to a less defective crystalline structure of the material.

Info:

Periodical:

Materials Science Forum (Volume 945)

Main Theme:

FarEastСon - Materials and Construction

Edited by:

Dr. Denis Solovev

Pages:

131-135

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.945.131

Citation:

N.P. Lukutsova et al., "Fine-Grained High-Strength Concrete", Materials Science Forum, Vol. 945, pp. 131-135, 2019

Online since:

February 2019

Authors:

N.P. Lukutsova *, G.N. Soboleva, S.N. Golovin, E.V. Chivikova, E.V. Ogloblina

Keywords:

Complex Nanodisperse Additives, Fine-Grained High-Strength Concrete, Mineral Components, Stabilizer, Strength, Structure, Ultrasonic Dispersion

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References

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Paper TitlePages

Exploration on Feasibility of Preparing Cement Clinker with Artificial Aggregate Concrete

Authors: Jin Bang Wang, Zong Hui Zhou, Dong Yu Xu

Abstract: Combining with the utilization of waste, an new idea of using the waste to prepare high-strength artificial aggregates was put forward in this paper. The concrete was also prepared by using these aggregates. The demolished concrete could be recovered and used as cement raw meal to produce new cement clinker. In this study, the feasibility of making cement clinker with this kind of demolished concrete was studied. The concrete aggregates composed of steel slag, blast furnace slag, coal gangue and fly ash were prepared. The concrete was prepared using these aggregates with the water-cement ratio of 0.45, 0.50 and 0.55 respectively. The compressive strength of the concrete in 28 days is 52.8MPa, 46.4.2MPa and 42.6MPa, respectively, higher than that of ordinary concrete. In accordance with the ratio of cement raw meal, the cement clinker is produced by adding appropriate limestone, clay and other correction materials. After hydrated for 3 days, 7 days and 28 days, the cement paste compressive strength is 47.1 MPa, 59.8 MPa, 75.6 MPa, respectively, which reach the requirements of ordinary 42.5 Portland cement.

906

Influence of Nano-SiO₂ and Nano-CaCO₃ on the Mechanical Properties of Concrete with Different Strength Grades

Authors: Miao Zhou Huang, Tao Meng, Xiao Qian Qian, Jin Jian Zhang

Abstract: The flow ability, mechanical properties and microstructure of concrete with different strength grades affected by nano-SiO₂ and nano-CaCO₃ was studied. The experiment results showed that the strength of concrete at early age was increased by adding the nano-materials if the strength grade of concrete was not high. But the strength at the age of 28 days was not affected a lot by adding these nano-materials. On the other hand, it was not useful to the strength if the strength grade of concrete was high.

480

The Effects of Mineral Admixture on the Compressive Strength of Concrete

Authors: Mei Li Zhao

Abstract: Mineral admixture was one or more industrial waste, or mixed with finely ground natural minerals, or grinded mixture.By replacing part of the cement with mineral admixtures , cement could be saved and improved the performance of concrete. In this paper，the compressive strength and slump of the concrete with mineral admixture were tested. The amount of cement replaced by mineral admixture in the concrete affected the compressive strength and the slump. According to the compressive strength and slump of the concrete, the optimum dosage of the mineral admixture was from 30% to 40%.

263

Experimental Study of Compression for Multi-Scale Polypropylene Fiber Concrete

Authors: Ning Hui Liang, Xin Rong Liu, Ji Sun

Abstract: Through compression tests on 30 plain concrete and polypropylene fiber concrete specimens with the dimensions of 100mm × 100mm × 100mm , studied the influence of the different scales of polypropylene fiber and hybrid fiber on concrete compressive strength and compressive deformation. The results showed that: the compressive strength of concrete for single-doped fiber has little effect to improve concrete compressive strength, some even get lower,but mixing-doped coarse-fine fiber had increased 6.2%~13.7%. Doped-fiber can improve the concrete compressive toughness, it's enhancement sort: mixing-doped coarse-fine fiber concrete > single-doped coarse fiber concrete > single-doped fine fiber concrete> plain concrete

1584

Influence of Nanostructured Fibers on Properties of Building Composites

Authors: Natalya Valentinovna Makarova, Vasiliy Petrovich Pogodaev, Anton Vasilyevich Pogodaev, Andrey Vladimirovich Kozin, Aleksey Sergeevich Lipovoy

Abstract: Currently, interest in nanotechnology concept for cement composites is steadily growing. Results of investigations of the concrete surface, reinforced with nanostructured mineral fibers by using atomic force microscopy (AFM) and dynamic ultra-micro hardness tester (DUMHT) of the specific areas of surface are presented. For comparison plain concrete and concrete with addition of single mineral fibers investigated as well. The analysis of the obtained data has shown that as a result of the directed microdisperse structurization provided by nanoinitiators on a surface of fibers, increase strength and deformation characteristics of a material. The main objective of this paper is to research the mechanisms of pattern formation surface of the concrete contained the High-modulus basalt microfiber (HMBMF) as a solid carrier for nanoparticles.

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