How to purchase and use of concrete admixture

Correct purchase and using additives, can produce huge economic and technological value. Not only can improve the strength of concrete, can reduce the cost of concrete mix. Specific methods are as follows:

1. test link

Admixture testing various technical indicators, is prior to the negotiation of important links. Through tests, additives should be determined by the specification of the eligibility criteria. Including the solid content of admixtures, water rates, density, water reduction of cement paste fluidity and concrete and other technical indicators. Suggested concrete rate as a key indicator to measure the level of quality of additives.

2. procurement procedures

After the admixture of clear eligibility criteria, you can start purchasing negotiations. Recommended test for determining the eligibility criteria, the additive manufacturers are bidding. Additive supply quality level is not lower than the tender requirements under supplies even at low price to determine manufacturer.

Meanwhile, the choice of additive manufacturers, should consider the manufacturers size, distance and transport capacity, large-scale mixing station or a large level of project delivery experience and quality of supply, as well as after-sales service ability and level, not manufacturer filter price as the only indicator.

3. check links

Mixing admixture admixture of storage prior to testing, testing results against contracting standards qualified before storage. Recommends that the distinction between key indicators and indexes. Through long-term practice of Haomei believes that indicator for the admixture of water reduction (mortar) and concrete water; reference density (specific gravity), the solid content and the fluidity of cement paste. Due to time reasons, general acceptance link testing specification is density, fluidity of cement paste and water reduction (mortar).

Storage display admixture is not qualified and recommended treatment plan are as follows:

(1) return: when formulating admixture of the eligibility criteria, will have a upper and lower the permitted fluctuation limits. If rate lower eligibility criteria limit the test results should be returned.

(2) the demotion: in case of an emergency, such as admixture inventory to meet production needs, by mutual agreement, do the downgrade, due to inadequate water-reducing rate of lead additives the additive manufacturers are responsible for the increased portion; or by mutual consensus, also make downgrade, solution as above.

On the admixture of unqualified handling, and recommendations stated in the purchase contract, avoiding both in admixture unqualified without law and disputes.

4. use links

(1) generally, inspectors should strictly adhere to established concrete mix, including the amount of additive in the mix;

(2) every day before and during the production process, quality inspector should test the moisture content of sand and stone aggregate, used to guide production; production of actual moisture of sand, stone, a more accurate reflection of the actual amount of water consumption in a single, which reflects the water requirement of cementitious materials and aggregate fluctuations, and admixture rate fluctuations;

(3) properties of raw material when fluctuations occur, timely adjustment of concrete mix. The increase of water demand of cementitious materials and aggregate and admixture rate of decline, lack of water consumption can cause unilateral. Right approach is appropriate admixture dosage, making water do not exceed those established in a single concrete mix, keeping the same water to Binder ratio to ensure the strength of concrete.

5. routine testing

Additive after detection before storage, in line with the stipulated standards before granting the contract of storage. Because the rate of testing results and concrete mix would have some access, it is recommended that after storage General detection of admixtures. Test items include water for concrete, solid content, and so on. Among them, the water as the key indicator for concrete, must comply with the requirements.

After a routine examination, such as the concrete rate volatility, should take out admixture of qualified samples were compared in the past, analysis of changes in raw materials is additive or other raw materials. And adjusted according to the results inform the inspectors concrete admixture dosage to ensure water to Binder ratio does not exceed the design value, so as to guarantee the strength of concrete is not affected. And shall immediately notify the change of raw material suppliers quality improvement.

6. test validation

In order to ensure the rationality of the production mix, it is recommended that at least monthly to common concrete mix for no less than 2 times the test validation. Haomei found that the high cost of a concrete problem or the vast majority of concrete batching plant, the lack of common concrete mix ratio test to verify.

Concrete test validation, from the raw material quality, workability and strength of concrete and comprehensive verification.

website: www.haomeibatchplant.com to see more information about different parts of concrete batching plant, and if you have more question about it, feel free to contact us, we will reply you as soon as possible.