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Date of Publication:2008-01-01

Journal:工程力学

Affiliation of Author(s):建设工程学部

Volume:25

Issue:11

Page Number:134-140

ISSN No.:1000-4750

Abstract:Meso-mechanics method of composite materials is adopted to analyze the
   mechanical properties of concrete in moisture conditions, which are
   influenced by the different volume fraction ratio of kinds of phases,
   pore rate and also the water saturation. Cement-based concrete can be
   defined as a combination of four phases: coarse aggregate, hydrated
   mortar, active pore and entrained non-active pore; the active pore will
   be filled with free water in moisture environment. Two types of pore and
   the mortar are regarded as the equivalent matrix, and the aggregate as
   the inhomogeneous inclusion. A kind of double inclusion model is
   proposed based on the equivalent inclusion theory and the Mori-Tanaka's
   concept of average fields. A united compressive strength expression is
   established by combining with the fracture mechanics method. The
   influence of various factors on the compression strength can be
   reflected by parameter analysis. The theoretical results demonstrated
   that the strength of concrete is controlled by the weaker component
   between the aggregate and mortar, that existence of pore water would,
   compared with the dry concrete, lead decrease of compression strength of
   wet concrete, which are agreeable with the experimental results.

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