But while observing this kind of mixing material carefully , find that some aggregate surface is dry, there are some small dry cement groups in addition.

First, the harmful gas emissions were tested in mixing plant, the construction site and laboratory.

In order to achieve quality concrete, perfecting the quality assurance system and raising the production level of concrete mixing plants are the task of construction units and supervisory personnel.

Then the experiments of measuring mixing index for concrete were conducted for its verification.

Through indoor experiments, the influence of sand equivalent changes on the mixing time of micro-surfacing mixture, the emulsifier dosage and the performance after shaped was discussed.