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Journal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.3, No. 45)

Publication Date:

Authors : ; ;

Page : 240-246

Keywords : water polyurethane dispersion; cement composition; deformation properties; mechanical properties; strength plastic.;

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The article considers the possibility of synthesis of cement compositions with improved physical and mechanical properties and deformation characteristics based on Portland cement and an water polyurethane dispersion. The mechanical properties of the cement paste based on Portland cement with a content of granulated blast furnace slag and 1% of an aqueous polyurethane dispersion, and found that by modifying the composition of the nano-sized cement additive have improved by 32% compressive strength at 22% and flexural strength. The results of studies to determine the strength of the plastic-modified cement compositions that complete the picture of the impact of water polyurethane dispersion on the processes of structure of cement stone. Curve analysis showed that the amount of plastic strength sample supplemented with 1% water polyurethane dispersion less than twice as compared with the control sample with respect to time of the induction period of 4,5 hours. Probably, the rapid growth of plastic strength test sample affects its strength at early stages of curing, while more slow and gradual increase in the strength of plastic with the addition of the sample is displayed on VPUD stackable strength over time of the cement stone, wherein the composite material has a more ordered structure. Crack cement compositions studied comparative method R. Levmita. The control composition is cracked for 10 hours experience, whereas sample 1% modified water polyurethane dispersion cracked for 13 hours, i.e. at fracture above 30%. Studies show that 1% water polyurethane dispersion significantly affect the deformation properties of the cement composition. The results of studies of the mechanical properties of cement-burghers solution with 1% water polyurethane dispersion and control samples. The flexural strength of the modified and control samples are not significantly different, while the compressive strength, generally showed similar results. Analyzing these results it can be concluded that the presence of fine aggregate water polyurethane dispersion reduces the influence on the mechanical properties of the cement composition. It is planned to reduce the proportion of filler in the system and to find the optimal balance between binder and aggregate, will not significantly affect the mechanical properties of the modified at the nanoscale composite. New modified solution are examined for water absorption, water resistance, adhesive strength, adhesive strength with base, corrosion resistance, fracture toughness over standard methods. Such material is planned to be recommended for use for the protection of concrete structures.

Last modified: 2016-07-26 15:26:24