Research on Visual Grading and Dynamic Modulus of Elasticity of Larix olgensis Laminate

The Larix olgensis laminate was visually graded respectively with Chinese standard GB 50005—2003, Japanese standard JAS 1152 and American standard ASTM D245-2006.Then the nondestructive test was done by MSR. It was concluded by comparing and analyzing the visual grading results and MSR test results that the result from visual grading according to Chinese standard was similar to that from the American standard, the Japanese standard was the strictest with knots. The result of MSR test basically conformed to normal distribution, the skewness was -0.0749, the testing data were generally small and concentratively distributed. Compared with Chinese standard and American standard, the visual grading result by Japanese standard showed a better confirmation with MSR test result.