Abstract
Hydrophobic substances contain in its structure non-polar groups by which have the capability to "repel" water molecules. Because of them the material become hydrophobic, i.e. it is not water-wettable. Hydrophobic additives are used in various areas, including buildings, bridges, ceramic materials, underground constructions and marine constructions. The use of hydrophobic admixtures is one of the ways to protect building elements from adverse water effects, thereby increasing their durability by reducing the water absorption. In our study we investigated the influence of siloxanes on compressive strength and absorbability of cement mortar. The modification of cement mortar microstructure due to addition of organosilicon compounds was analyzed by mercury intrusion porosimetry. Finally we assessed the effectiveness of poly(dimethylsiloxane) and water solution of methyl silicon resin as hydrophobic admixture by measuring the water absorption coefficient.
Highlights
The impact of an aggressive external environment is one of the most frequent causes of degradation of building materials
After 28 days ageing addition 1% and 2% of water solution of methyl silicon resin (MESI) caused measurably increase the compressive strength
The main objective of this paper is to investigate the influence of hydrophobic admixtures based on organosilicon compounds on physical properties of cement mortar
Summary
The impact of an aggressive external environment is one of the most frequent causes of degradation of building materials. The parameter determining the influence of water on the porous material is its absorbability, i.e. the material's ability to absorb and retain water in the pore space. It is usually determined by the amount of water adsorbed by the material due to capillary forces. The majority of building materials are porous Those based on Portland cement show not sufficient resistance to some physical and chemical impacts from the environment. This is the result of porous structure and susceptibility to the penetration of water. The first results on microstructure, capillary water https://doi.org/10.10 51/matecconf /201928202030 absorption, absorbability and mechanical properties on admixed cement mortar were received and are presented here
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