Heat resistant mortar using Portland cement and waste clay bricks

Heat-resistant properties of the cement stone are provided by both high-temperature filler and the modified matrix on the basis of the Portland cement. For production of heat-resistant compositions as high-temperature filler, it is offered to use the secondary and accompanying products of production of carbide of silicon (SiC) and production wastes of the abrasive tools on a ceramic base. Increase in heat-resistant properties of the Portland cement knitting substance is offered to be solved by introduction to the structure of a cement composition of single substituted orthophosphate of calcium. The choice as an additive to the Portland cement a single substituted orthophosphate of calcium (double superphosphate) is proved by questions of safety measures and ecology, when using ortho-phosphoric acid and its salts for giving to cement compositions heat-resistant properties. The multicomponent composition of fine-grained concrete makes it possible to operate effectively the processes of forming the structure of cement stone at all stages of the technology, and to obtain materials with the most diverse set of properties. An introduction to the structure of a composite of 5% of filler of cyclonic dust of carbide of silicon, and a replacement of quartz filler by waste of abrasive production gave the increase of the compressive strength at 12%, bending strength for 36%. The thermal firmness increased by 3 times. An introduction to the structure of heat-resistant composition of single substituted orthophosphate of calcium (double superphosphate) in a number of 0.2% of the mass of cement allowed to increase the thermal firmness of structures to 20 heat exchanges (water, 800 oС).

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Heat-Resistant Cement Composites Using Volcanic Pumps and Vermiculite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.931.489 ◽

2018 ◽

Vol 931 ◽

pp. 489-495 ◽

Cited By ~ 2

Author(s):

Tolya A. Khezhev ◽

Artur V. Zhurtov ◽

Gadzhimagomed H. Hadzhishalapov

Keyword(s):

Portland Cement ◽

Crack Resistance ◽

Average Density ◽

Strength Characteristics ◽

Cement Composites ◽

Basalt Fibers ◽

Temperature Stresses ◽

Heat Resistant ◽

Expanded Vermiculite

The results of research on the development of heat-resistant cement composites using volcanic pumice and expanded vermiculite are presented. Compositions of heat-resistant cement composites are proposed that significantly reduce Portland cement consumption and simultaneously improve their heat-resistant properties. The use of basalt fibers in composites makes it possible to increase their strength, crack resistance and heat-resistant properties due to the perception of tensile temperature stresses. Part of the expensive vermiculite can be replaced by pumice without significantly increasing the average density of the composite, while their strength characteristics increase.

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Experimental Research on the Preparation of Heat-Resistant Concrete Using Normal Portland Cement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.852.490 ◽

2014 ◽

Vol 852 ◽

pp. 490-495

Author(s):

Jing You Hu ◽

Jian Bin Xie ◽

Shan Guang Qian ◽

Jian Feng Huang

Keyword(s):

Fly Ash ◽

Portland Cement ◽

Experimental Research ◽

Raw Materials ◽

Engineering Application ◽

Mixing Process ◽

Mixture Ratio ◽

Heat Resistant ◽

Mechanical Performances ◽

Mixture Ratio Design

Based on the heat-resistant mechanism, the orthogonal experimental method and the requirements for physical-mechanical performances of heat-resistant concrete, one mixing process project was taken as the target for analysis on the mixture ratio design of heat-resistant concrete. The conventional raw materials such as normal Portland cement, common crushed aggregates, fly ash and concrete admixture were adopted to manufacture the C30 heat-resistant concrete which gets the limit heat-resistant temperature of 500°C subsequently. And the influencing factors on the strength of heat-resistant concrete were also studied in this paper. Experimental results show that the mixture ratio design of heat-resistant concrete in this paper is reasonable. The engineering application results also show it is financially viable that adopting the normal Portland cement to manufacture the heat-resistant concrete with limit heat-resistant temperature of 500°C.

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