命题考点七 建筑木材和木制品、玻璃的特性与应用（The characteristics and application of seven construction timber and wood products and glass）.docVIP

命题考点七 建筑木材和木制品、玻璃的特性与应用（The characteristics and application of seven construction timber and wood products and glass） 1A410000 construction engineering technology 1a412,000 construction engineering village material 1 a412,000 building engineering materials section test online estimation The characteristics and application of the seven building timber and wood products and glass If you have any questions during the learning process, please visit the member center and ask me to answer the question. [textbook interpretation] A wood, 1. Classification and nature of trees Trees can be divided into coniferous trees and broad-leaved trees. 2. Moisture content of wood (1) moisture content: the water content of wood is indicated by water content, which refers to the percentage of the quality of the woods water content as the quality of wood drying. (2) moisture content index: the most important index of moisture content affecting the properties and applications of wood physical mechanics is the fiber saturation point and the equilibrium moisture content. 3. Dry shrinkage and deformation of wood Wood only changes in the content of adsorption water in the cell wall, which can cause the deformation of the wood. Because of the inhomogeneity of the wood structure, the deformation of wood is different in every direction. The direction of the longitudinal grain is the smallest, the radial is larger, the string is the largest. Therefore, when the wet material is dry, the size and shape of the section will change obviously. 4. The strength of wood Wood is divided into tensile, compressive, anti-bending and shear strength, while the tensile strength, compressive strength and shear strength are also divided into horizontal and horizontal lines. Ii. Characteristics and application of construction wood products Real wood floor According to the shape of real wood floor, can be divided into the joggle of real wood floor, flush archaize of real wood floor and real wood floor (with special s