A special area with certain thickness located between matrices and fibers is defined as ‘interfacial zone’ in this paper, which consists of a bulk phase (often called as interphase) and two interfaces, that is, the interphase/matrix interface and the interphase/fibre interface.

In this study, the effect of synthetic C-S-H gel hydrothermally produced with a kind of siliceous material and calcia material as raw materials on the interfacial zone between hardened cement paste and aggregate in concrete was investigated.

Cement paste and interfacial zone between aggregate and mortar for concrete were investigated through the method of SEM.

Distribution and diffusion mechanism of Sn in interface of ZA alloy soldered joints;

The interface microstructure and mechanical property of the joint were analyzed by SEM,EDAX and transverse tensile test.

An equation of the critical volume fraction, fpc, of particle-reinforcement in a composite, including particle size, yield strength of the matrix, dissipation work in the vicinity of the particles and the width of the interface zone, has been educed by the energy theory on the basis of the types of microscopic failure of the composite.