Approach to the application of ultrasonic technology to measuring physical properties of new building materials

Abstract

Non-metal ultrasonic testing analyzer could be used to measure the physical properities of new building materials. Taking a new subgrade material named municipal solid waste incineration bottom ash (MSWIBA) as an example, the feasibility that ultrasonic wave velocity was used to measure physical and mechanical properties of MSWIBA was analyzed according to studying the relationship between uniaxial compressive strength (<em>σ_c</em>), main differential stress peak value (<em>σ</em>₁-<em>σ</em>₃)<em>_max</em>, cohesive force (<em>c</em>), internal friction angle (<em>φ</em>) and ultrasonic wave velocity. The feasibility that the Poisson's ratio computational formula of materials that owns cohesive force was analyzed whether it is suitable for use in MSWIBA. The dynamic elastic mechanics parameters were calculated based on elastic theory. The results show that there is a positive linear correlation relationship between <em>σ_c</em>, (<em>σ</em>₁-<em>σ</em>₃)<em>_max</em>, <em>c</em>, <em>φ</em>, and ultrasonic wave velocity with the slope changing in a small scope. The Poisson's ratio computational formula of materials that owns cohesive force is suitable for MSWIBA, and the Poisson's ratio is 0.20~0.28 with dry density being 1.5 g/cm³ within 28 days . The dynamic modulus of elasticity (<em>E</em>) and dynamic shear modulus (<em>G</em>) increase with curing age increasing (<em>E</em>, <em>G</em> =<em>A</em><em>ln</em><em>θ</em>+<em>B</em>); however, the dynamic Poisson's ratio decreases with curing age increasing.