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Preparation of composites of natural rubber latex–Portland cement for moulds
Author(s) -
Dessouki A. M.,
Taher N. H.,
ElNahas H. H.
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199804)45:4<339::aid-pi930>3.0.co;2-t
Subject(s) - materials science , composite material , portland cement , natural rubber , cement , shrinkage , carboxymethyl cellulose , vulcanization , sodium , metallurgy
The aim of this study was to prepare polymeric moulds using natural rubber latex (NRL)–Portland cement (PC) composites based on a delayed‐action mechanism. Factors affecting the preparation process, such as concentration, mixing percentage, additives and their effects on what is regarded as a delayed‐action coacervant combination were studied. Composites of NRL–PC for moulds were prepared as two separate parts. The stabilized NRL (100 parts) with hydroxyethyl cellulose (HEC) 2 parts per 100 parts of latex (phr) as stabilizer and a delayed‐action coacervant (sodium metasilicate as a delay agent) 5 parts per 100 parts of latex on the one hand and the dry blend of cement, 65 parts soluble in water, as a paste on the other hand, were mixed thoroughly on the site. HEC was added to the rubber latex to prevent coagulation with the electrolyte (sodium metasilicate) present in the mixture. Some physical properties of the rubber–cement mould prepared, such as shrinkage, water uptake and mechanical properties were studied. Radiation and ageing effects under different environmental conditions (such as under soil, under water and in the presence and absence of UV radiation) on the mechanical stability of the rubber–cement composites were investigated. The mechanical stability improved when the samples were kept under soil and under water, but deterioration was observed for samples kept in the presence of UV radiation (sunlight). The possibility of using the rubber–cement moulds prepared in the field of construction as crack filling material, expansion joint fillers and for soil injection is suggested. © 1998 SCI.