| Summary: | 碩士 === 國立交通大學 === 材料科學(工程)研究所 === 81 === A composite, a kind of polymer portland cement concrete(
PPCC) consisted of cement, sand and unsaturated
polyester either with or without water, was studied as
chemically bonded high strength, fast setting cementitious
material. The composite developed under the apprepriate
formulation can attain a high compressive strength of over
100MPa and a flexural strength of about 30MPa, which are
more than 5 times stronger than normal concrete of 20MPa for
compressive strength and 5MPa for flexural strength. This ne w
cementitious material attains about 50% of strength in one
hour and about 80% of strength in 24 hours at the room
temperature. It is found that strength development of the
material depends on the amounts of cement, sand, resin kind
as well as water. From kinetic analysis, It is concluded
that cement is not only a filler but also acts as chemically
bonded agent through the matrix of cementitious materials.
The mechanism of the strength development is not according
to the hydration of the normal concrete, but to the
polymerization of unsaturated polyester resin and the
interaction between resin and cement as well.
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