Grain phosphorus is active,and quantitative indexes,such as pozzolanic effect specific strength,strength contribution rate,activity index and pozzolanic effect form,can be used to judge and analyze phosphorus' pozzolanic effect,influence factors and the pattern in hardened phosphorus paste.

The hollow cylindrical sandwich of foamed Al alloy with high specific strength was prepared in order to improve the ability of energy absorption.

The results show that, the elastic modulus increases from 270?MPa to 550?MPa and the yield strength increases from 3?MPa to 20?MPa with the decrease of the pore diameter; the yield strength increases with the decrease of the porosity; the porous aluminum alloy has high specific strength and energy absorption capability.

Study on the relationship of properties of cotton and tenacity of yarns;

When used in combination, it can give the tenacity and other important properties of individual fibres.

The effects of IAA,ABA content and POD activity on the accumulation of cellulose and the quality of fiber strength by Xinluzao 10 and Xinluzao 16 was studied.

Using the method of specific strength,the pozzolanic effect of fly-ash in recycled aggregate concrete has been researched,comparing with natural aggregate concrete in the same mixing ratio,the pozzolanic effect of fly-ash in recycled aggregate concrete is weaker than in the other concrete.

The equivalent coefficient of 10?%,20?%,30?%,40?% strength ratio of different admixture design.

The effects on strength ratio of no vibrated self compacting concrete and vibrated concrete are discussed.

35, the mortar with 30% by mass of fly ash in cementitious has the compressive strength ratio more than 0.

It found that the compression strain and the permanent compression set values were required to be 20%~25% and under 5% respectively,the specific compression strength was 3.