毛竹材质老化过程中几个基本性质变化与建筑用原竹的选择

对1998年至2008年间生的毛竹进行了8个年份的材性测试,主要研究了毛竹材质老化过程中各年龄段的生材含水率、基本密度、全干干缩系数与竹龄及生长部位的关系.研究表明,毛竹不同出生年份的生材含水率、全干干缩率和吸水率这三方面的性能总体上呈现出两端高中间低的"u"型,而在基本密度表现为上"n"型,竹龄4～10年为这两个相反型的谷底和峰高两个转折点,则表现为4～10年为材质稳定期.10年以上毛竹的老化则表现出基本密度的下降和干缩性的增大及吸水率的增高.4～10年生毛竹在材用上可以选用,在此范围内,竹子越老,基本密度的值也越大,差异千缩小,则原竹的抗裂性越好,可以直接用于建筑用原竹的原料.

Abstract：

The basic physical properties,including green moisture content,basic density,solute shrinkage coefficient and water absorption ratio,of moso bamboo(Phyllostachys pubescens)were measured from1998 to 2008 every year.The results indicated that the relation between green moisture content,solute shrinkage coefficient and water absorption ration of bamboo and age showed a U-shaped curve,while the relation between basic density of bamboo and age showed a ∩-shaped curve.Both the valley bottom of basic density and valley peak occurred from 4-year-old to 10-year-old,illustrating that the period from 4 to10 years is the period of stability of its quality Moso bamboo 10 years old or more showed increased water absorption ratio and solute shrinkage coefficient and decreased basic density.Bamboo with an age of 4-10years is suitable material for green buildings,for it has high basic density and resistance to shrinkage and crack.

Performance on Some Basic Physical Properties of Moso Bamboo(Phyllostachys pubescens)During Aging Related to the Selection of Bamboo Culms for Green Buildings