Experimental Research On CA Mortar Mixing Parameters And Mixing Process

The emulsified asphalt cement mortar (CA mortar for short) used in ballastless track board is one crucial construction materials of high-speed railway construction.Its production process must be researched and tested detailly for the high requirements of the performance.At the conclusion of domestic and foreign relevant test and construction technology, we design a new kind of mixer(MSO150 mixer for short) and study the different mixing parameters by means of plentiful comparison to get a new model behaving well and get the suitable mixing parameters and mixing process as well.The reaction mechanism and detecting techniques of the CA mortar were summarized firstly to analyse the reaction process more deeply. The twin-shaft mixer used in concrete mixing will be improved into a new model used in CA mortar mixing.We drill twe rectangle holes at each agitating vane to strengthen the shear and convection in order to apply to CA mortar mixing which is watery.The orthogonal experiment is arranged to get detection data under various parameter combinations and the suitable mixing parameters and mixing process through the contrast anslysis.We will get the advantages and disadvantages between MSO150 mixer and the other mixers used in CA mortar.The improved measures will be further discussed to make MSO mixer be more suitable for CA mortar production.The analysis shows that the MSO150 mixer is suitable for CA mortar mixing. The shear and convection of material in mixing process are strengthened through the structure changes of the vanes and the mixing productivity is enhanced.90°and 55°were selected for the arm and the blade.The quick mixing speed should be 120r/min.Inflation especially need to be attended which is mainly influenced by the reaction time of emulsified asphalt and the dry powder.The time shouldn't be too long which should be controlled in a suitable range.The first time of slow mixing and the quick mixing time are lmin and 3min respectively by the test. In the analysis process, the mesaure indexes are divided into three categories for that they are too much to get reasonable conclusion. The analysis combining mixing process test with reaction mechanism of various components is the key to get reasonable conclusion and improve the production performance.