Comparison of microcrack formation boundaries determined by complex of physical methods with long-term strength of expanded clay concrete under different types of stress state

This work aims to experimentally study the strength and strain of expanded clay concrete during short-term long-term compression tension under various loading modes. A technique for testing tension, including boundaries microcrack formation by a complex physical methods (tensometric, ultrasonic pulsed, acoustic emission), is given. The results tests monotonic low-cycle compression, as well methods, are obtained. compared with types stressed states. Strain diagrams axial "ultrasound transmission speed - stress level" "number pulses also Empirical formulas proposed determining microcracking in relationship between level time staying specimens load tension. allow formulation several proposals clarifications normative documents calculate design lightweight elements structures.