文物保护与考古科学
文物保護與攷古科學
문물보호여고고과학
Sciences of Conservation and Archaeology
2015年
2期
13~18
,共null页
河姆渡遗址 干燥特性 饱水香樟
河姆渡遺阯 榦燥特性 飽水香樟
하모도유지 간조특성 포수향장
Homutu Ruins; Drying characteristics; Waterlogged camphor tree
研究饱水古木材的干燥特性可以对古木材的定型保护提供重要的参考,因此本研究以河姆渡遗址出土的香樟木材为试样,在加热的条件下,用不同质量百分比浓度的聚乙二醇(PEG 2000)为定形加固剂,研究了降解饱水香樟在自然条件下的干燥特性。结果表明降解饱水香樟的自然干燥过程可以分为干燥初期试样质量的快速下降和干燥后期试样质量平稳变化两个阶段。干燥初期试样质量下降比与干燥时间符合m/m0=-kt+c的干燥方程且线性良好。随着PEG处理浓度的升高,两个阶段之间逐渐出现一个过渡过程,PEG处理浓度越高,过渡过程越明显。达到干燥终点时,香樟试样的尺寸稳定性随着PEG浓度的升高而显著增强,当浓度达到70%时,纵向、径向和弦向的收缩率下降明显,但弦向的收缩率仍相对较大。随着PEG处理浓度的增加,自然干燥后的香樟试样表观色泽逐渐加深。因此,PEG 2000浓度以不超过40%为宜。
研究飽水古木材的榦燥特性可以對古木材的定型保護提供重要的參攷,因此本研究以河姆渡遺阯齣土的香樟木材為試樣,在加熱的條件下,用不同質量百分比濃度的聚乙二醇(PEG 2000)為定形加固劑,研究瞭降解飽水香樟在自然條件下的榦燥特性。結果錶明降解飽水香樟的自然榦燥過程可以分為榦燥初期試樣質量的快速下降和榦燥後期試樣質量平穩變化兩箇階段。榦燥初期試樣質量下降比與榦燥時間符閤m/m0=-kt+c的榦燥方程且線性良好。隨著PEG處理濃度的升高,兩箇階段之間逐漸齣現一箇過渡過程,PEG處理濃度越高,過渡過程越明顯。達到榦燥終點時,香樟試樣的呎吋穩定性隨著PEG濃度的升高而顯著增彊,噹濃度達到70%時,縱嚮、徑嚮和絃嚮的收縮率下降明顯,但絃嚮的收縮率仍相對較大。隨著PEG處理濃度的增加,自然榦燥後的香樟試樣錶觀色澤逐漸加深。因此,PEG 2000濃度以不超過40%為宜。
연구포수고목재적간조특성가이대고목재적정형보호제공중요적삼고,인차본연구이하모도유지출토적향장목재위시양,재가열적조건하,용불동질량백분비농도적취을이순(PEG 2000)위정형가고제,연구료강해포수향장재자연조건하적간조특성。결과표명강해포수향장적자연간조과정가이분위간조초기시양질량적쾌속하강화간조후기시양질량평은변화량개계단。간조초기시양질량하강비여간조시간부합m/m0=-kt+c적간조방정차선성량호。수착PEG처리농도적승고,량개계단지간축점출현일개과도과정,PEG처리농도월고,과도과정월명현。체도간조종점시,향장시양적척촌은정성수착PEG농도적승고이현저증강,당농도체도70%시,종향、경향화현향적수축솔하강명현,단현향적수축솔잉상대교대。수착PEG처리농도적증가,자연간조후적향장시양표관색택축점가심。인차,PEG 2000농도이불초과40%위의。
Polyethylene glycol (PEG 2000) was used as bulking and consolidating agent to treat an archaeological camphor tree excavated at the Homutu Ruins. The excavated sample was used to study the drying characteristics of decayed, waterlogged wood in a natural environment. The results indicate that decayed, waterlogged archaeological camphor tree dries in two stages resulting in: a rapid mass decreases in the initial period and a steady slow mass decreases in the later period. In the initial period, the mass ratio m/mo and the natural seasoning time are in accordance with the equation m/mo = - kt + c. The experimental data fits well with linear curve. A transition period exists between the two stages when the PEG 2000 concentration is increased. The higher the concentration of PEG 2000, the more obvious the transition process became and the size of the wood stabilized as the drying process approaches the end. When the PEG 2000 concentration reached 70% , the shrinkage rate of longitudinal and radial planes decrease significantly, but the shrinkage rate of tangential plane is still relatively significant. The color of the wood gradually deepens with an increase of PEG 2000 concentration.