Matters Needing Attention For Adding Admixtures In Road Concrete
Choose the right admixture
At the present stage, there are many kinds of concrete admixtures in our country, so we must choose the appropriate admixture type in the concrete highway project, the main basis of the choice has the following two aspects: one is the nature of the project;
The second is the main use of concrete.
In the actual highway engineering project, it should be based on the premise of meeting the specific requirements of design and construction to ensure the economy and rationality of the project.
In the concrete construction process, according to the actual situation from the following types to choose:
The first category refers to the modified naphthalene series water reducing agent, compared with other water reducing agent, water reducing agent of this type can be largely to hydration heat of cement to improve the ability of, and thus can be applied to the large volume concrete, in addition, the water reducing agent can well reduce the hydration heat generated in the process of concrete construction.
The second type is polyester admixtures and air entraining agents. Compared with other types of water reducing agents, this water reducing agent is used in the production of durable concrete because of its strong shrinkage reduction ability.
The third kind is poly carboxylic acid kind of concrete admixture, compared with other admixture, because this kind of additive has larger water reducing rate, thus it can be widely used to make high strength concrete, in addition to this, because this kind of admixture can increase the pumpability of concrete, so in order to be able to effectively avoid cement secondary adsorption problems, can adopt the way of pumping concrete.
2. Choose the appropriate incorporation method
3. Determine the dosage of admixture
For concrete, the amount of admixture will directly affect its overall quality, adding too much or too little will lead to the concrete's role is difficult to get full play, therefore, in the use of prior should be tested to determine the amount of admixture.
In the process of the test should be used in the specific construction will use the material, so as to find out the appropriate amount of admixture range, and combined with the specific project construction cost to determine the final amount of admixture.
