Effect of Agro-Forest-Waste on Cement Bonding Properties and the Properties of Cement Bonded Charcoal-China Fir Particleboard

• Main Authors: Chia - Wen Peng, 彭嘉文
• Other Authors: Tsai - Yung Chen
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/70916184431380911039

碩士 === 國立中興大學 === 森林學系 === 87 === Abstract The purpose of this research is to study the testing device of hydration temperature that we set up it by ourself. Measured the hydration temperature and produced mechanical specimen for 14 kinds mixture which of cement bonded agro-forest-waste . Measured the properties of the specimen for compressive strength, bending strength and tensile strength of agro-forest-waste mixtures and analyzed the correlation of hydration temperature and mechanical properties. On the otherhand, study the effect of charcoal particles on the properties of cement bonded China fir particleboard .The main results are summarized as followings: 1. Taiwania(55 ℃) is the highest , Betel-nut stem(25.4 ℃) is the slowest among the highest hydration temperature (TE'')of 14 kinds of cement bonded agro-forest-waste mixtures . On the otherhand, Japanese fir(10.7 hr.) is the fastest , Taiwan hemlock , Moso bamboo and Betel-nut stem are slower among the required time to reach the highest temperature(T2''). As far as the inhibitory index of every testing specimen are concerned, Japanese fir(0.57) is the lowest , Betel-nut stem (104.84) is the highest . 2. The mechanical properties of cement bonded agro-forest-waste mixtures showed that as far as compressive strength is concerned, Rice husk(199.9 kgf/cm2) and Formosan alder(199.5 kgf/cm2) are larger , Moso bamboo(24.4 kgf/cm2) and Betel-nut stem(6.3 kgf/cm2) are smaller. The relationships between inhibitory index and compressive strength are 0.61*. The bending strength of China fir(66.7 kgf/cm2) is the largest , Moso bamboo(16.2 kgf/cm2) and Betel-nut stem(4.2 kgf/cm2) are smaller. The relationships between inhibitory index and bending strength are 0.76**. The tensile strength of China fir(24.1 kgf/cm2) is the largest , Betel-nut stem(1.5 kgf/cm2) is the smallest. The relationships between inhibitory index and tensile strength are 0.67**. 3. The bending strength of cement bonded charcoal-China fir particleboard is 26.5∼82.3 kgf .The properties of water absorption (14.5 ∼42.6 ％) and incombustibility are better than cement bonded China fir particleboard . The mix ratio of C70w8ch22、C75w6ch19 、C80w15ch5、C80w5ch15 and C80w0ch20 can pass CNS 3802 Fiber Cement Boards. 4. The amounts of hygroscopic and dehydration of cement bonded charcoal-China fir particleboard after 24 hr. are 94.96∼155.53 g/m2 and 33.53∼69.34 g/m2 respectively. It decreased the amounts of hygroscopic and dehydration that the amount of charcoal particles increased. 5.The insertion loss value of electromagnetic is 3.5∼13 dB and the return loss value of electromagnetic is 0.6∼6.7 dB for cement bonded charcoal-China fir particleboard. The sound transmission loss value is 41.91∼43.28 dB. The electromagnetic shielding and sound insulation properties both are better than wood-based material boards. Key word Hydration temperature, Agro-forest-waste , Cement bonded China fir particleboard, Cement bonded charcoal-China fir particleboard