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Theoretical predictions of the elastic moduli of polymer‐impregnated hardened cement paste and mortars
Author(s) -
Whiting D.,
Kline D. E.
Publication year - 1976
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1976.070201215
Subject(s) - materials science , composite material , cement , mortar , polymer , epoxy , volume fraction , composite number , portland cement , elastic modulus , filler (materials)
Hardened coment pastes with water‐to‐cement ( w/c ) ratios of 0.4 and 0.6 and hydration times of one, three, seven, and 28 days were oven dried and subsequently impregnated with an epoxy resin formulation which was then polymerized in situ at 75°C. Portland cement mortars containing Ottawa sand and asbestos fibers as filler were also subjected to this impregnation process. Dynamic elastic moduli ( E ′) were measured at audio frequencies over a range of temperatures (100–400°K). Experimental values were compared with moduli calculated using various theoretical approaches based on two‐phase composite materials theory. Best agreement between experimental and calculated results occurs when Wu's theory for spherical polymer inclusions was applied to a cement‐based matrix. In the case of polymer‐impregnated mortars, experimental and theoretical results are in closest agreement at low temperatures and at low volume fraction of filler.