【摘要】 本文研究了在使用竹模板浇成的混凝土结构产生严重变形的原因，是由于竹模板吸收了现浇混凝土的水分所造成。进一步测定了竹模板的相对吸水率对其静曲强度和弹性模量的显著影响，并给出了计算公式，供在竹模板的间距支撑设计和使用时参考更多还原

【Abstract】 Methods to maximize wood hardness and dimensional stability includes chemical modification,compression and heating treatment.In this study,poplar wood( Populus ussuriensis )was treated with different concentrations of a melamine formaldehyde resin,which was low molecular weight and water soluble,and then compressed while being heated.The results showed 47 per cent of antishrink efficiency( ASE) .And the wood specimen were able to retain almost complete fixation when treated with 10 per cent of resin solution and then soaked in room temperature water and treated with 17 5 and 25 per cent of resin solution and then soaked in boiling water.更多还原