1. The varieties of additives should be selected according to the requirements of engineering design and construction, and determined through tests and technical and economic comparison.
2. It is strictly prohibited to use the admixtures that cause harm to human body and pollution to the environment.
3 admixture concrete used in cement, appropriate to use Portland cement, ordinary Portland cement, Portland slag cement, Portland volcanic ash cement, Portland fly ash cement and composite Portland cement, and should test the adaptability of the admixture and cement, meet the requirements can be used.
4. Materials used in concrete such as cement, sand, stone, admixture and admixture should comply with relevant national standards.When the concrete mixed with additives is tested, the raw materials used in the project should be used. The test items should be determined according to the design and construction requirements. The test conditions should be the same as the construction conditions.
5. When different kinds of admixtures are used together, attention should be paid to their compatibility and influence on the performance of concrete. Tests should be carried out before use to meet the requirements before use.
