Mechanical and durability properties of insulation mortar with rubber powder from waste tires
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Fine rubber particles from scrap tires can be used as an insulation material by incorporating with Portland cement mortar. In addition to thermal properties, there are special mechanical and durability properties that are important for the insulation mortar. The addition of rubber particles has negative impact on these properties. The special properties for insulation mortar can be improved using cellulose ether, redispersible polymer powder (RPP), and wood fiber. The objective of this study is to investigate the effects of these additives and the rubber powder on the properties of rubberized insulation mortar. With increasing rubber content, both flexural strength and compressive strength were reduced, but the reduction of flexural strength was not as significant as for the compressive strength. At a fixed rubber content, as the optimal amount of RPP and smaller rubber powder were used, the compressive strength of rubberized mortar satisfied the minimum requirement of the type N mortar. The drying shrinkage of the rubber mortar was about the same as the ordinary cement mortar. The permeability of the rubber mortar was low comparing with that of the ordinary cement mortar. The bond strength of the rubber mortar is low due to the reduced effective bonding surface.
KeywordsMortar Rubber particles Waste tires Mechanical property Durability properties
The authors wish to acknowledge the partial support by the US National Science Foundation under Grant CNS-0722023 to University of Colorado at Boulder. Opinions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsor. The authors also wish to acknowledge the partial support by CDPHE project No. 08-00168 to the University of Colorado at Boulder.
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