[Abstract]Objective To compare the fracture resistance and fracture modes of teeth restored with four diferent post-and-core systems.

Expermental research on the influence of hair fibre on the bending strength of cement;

The effects of secret-water on cement concrete bending strength;

On the basis of the damage and corrosion mechanism of the used tuyere sleeves of Baosteel,use the brown corundum and zircon power as the raw materials and study the thermal shock resistance,bending strength,compressing strength,porosity of Al2O3-ZrO2 for new sleeve.

Influence of process factors on the flexural strength of ZrO_(2(f))/PMMA-PMA composites;

Study on the effect of steel fiber adding ways on concrete flexural strength;

Analysis on flexural strength in adhesive section of mortar with different strengths;

Phase composition and microstructure of the composites were characterized by XRD and SEM,respectively,and the folding strength and compression strength were tested by universal testing machine.

The effects of five kinds of water-reducing agents: calcium lignosulfonate(CLS),modified calcium lignosulfonate(GCL1-6A),amino-sulfonic based superplasticizer(ASP),sulfonated naphthalene formaldehyde(FDN) and sulfonated melamine urea formaldehyde resin(SMUF) on the mechanical performances of mortar were studied,which include the compressive strength and folding strength.

On the basis of summarising of up the one\ s experience of the works, this article puts forwords to the design method of the mix proportion, which is the more practible method that folding strength be used for the design indice and describes some experience on the selection of the raw and processed materials.

Analysis of mechanism on improving draw strength of concrete by polymer;