Uniaxial compression tests were carried out based on acoustic emission technology to study the rule and process of damage evolution marble powder concrete (MPC) under compression. The fracture characteristics MPC are examined by analyzing variation signal parameters. model is established characteristic results showed that strength loss rate decreased with curing time, maximum 28 d was 6.2% when...

A meter-scale model test with microbially induced calcite precipitation (MICP) is an efficient method to validate this sustainable soil reinforcement technique. Mechanical and physical testing methods for evaluating the biocementation efficiency of tests are still being explored. In study, a calcareous sand base was treated MICP. The mechanical characteristics base, such as strength, shear-wave...

background : cement industry has many process units. basically all of these units can be considered as a source of noise. since noise pollution is defined based on its offensive hearing effects, the importance of the noise sources depends directly on the number of workers in the unit.   materials and methods : an experimental study has been done at tehran cement factory to recognize and analyze...