Characteristics of early age shrinkages development of HPC containing mineral admixtures;

Experimental research on the damaged characteristics of concrete at early age and subjected to static or dynamic load;

A new eddy current method is proposed which can be applied for concrete early age shrinkage(3 d) measurement without constraint conditions.

A prediction formula on tensile basic creep,which takes into account the effects of fundamental mechanical properties at early ages,age at loading and initial stress-strength ratio and so forth,is built by modifying previous classical creep models and with material behavior of hardening HPC,and a set of the parameters in the formula are obtained by fitting a great deal of experimental data.

An experimental study on tensile creep of high performance concrete at early ages;

Tentative research on non-destructive detection of early-age elastic modulus of concrete;

Study on non-destructive detection methods used to determine static modulus of elasticity of early-age concrete;

In order to avoid the early shrinkage cracking in concrete structures,the early-age tensile elastic modulus of commercial concrete is studied by a home-made experimental device,and the difficult problem of centering is solved successfully.

Development of internal humidity in concrete at early ages;

Analysis on surface protection time for concrete at early age in winter;