Abstract
The paper describes scientific and technical prerequisites for the development of composition of and production method for hydrophobic complex modifier based on the industrial wastes, including technical lignosulfonates (TLS) as a plasticizing ingredient; oil and fat tar as hydrophobic ingredient; and saponified wood pitch (SWP) as air entraining ingredient. The purpose of the presented studies was the development of an efficient modified concrete composition for construction of irrigation and drainage facilities construction by using a complex hydrophobic modifier. Experimental studies were carried out on concrete samples made of reference and test compositions in the laboratory of the “Building Materials” Department of the National Research Moscow State University of Civil Engineering. Comprehensive studies showed that the use of hydrophobic modifier allows obtaining concrete with water bleeding ratio reduced by 35–40%; reducing the concrete capillary suction and water absorption by 3 times; and increasing water penetration pressure (W8 and more), in comparison with concrete without additives. The developed complex hydrophobic modifier increases the strength by 12-18% and reduces shrinkage strain of concrete by 7.5% in comparison with the control composition without the modifier.
Highlights
IntroductionSuch modifiers, introduced in small amounts, significantly affect the physical and mechanical processes of the concrete structure formation, form a favorable structure allowing to significantly improve the complex of its physical and technical properties and to increase its durability [1-4]
The efficiency of using reclaimed land is inextricably linked with durability and operational reliability of an extensive system of commissioned hydraulic engineering structures
Complex studies on the effect of the complex hydrophobic modifier on the properties of cement and concrete mixtures, hardened concrete were conducted in this work
Summary
Such modifiers, introduced in small amounts, significantly affect the physical and mechanical processes of the concrete structure formation, form a favorable structure allowing to significantly improve the complex of its physical and technical properties and to increase its durability [1-4]. The key point in solving these problems is the use of hydrophobic modifiers
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