1. Concrete admixtures concrete admixtures according to GB8076-1997 is divided into nine categories:
Ordinary water reducing agent, high efficiency water reducing agent, early strength water reducing agent, slow setting water reducing agent, air-entraining water reducing agent and air-entraining agent, etc.. Production plant should be based on production and production equipment conditions, the product will be divided into batches of numbers, the admixture size of 1% (including 1%) with the species of admixture each number for 100 tons, less than 1% of the admixture each number for 50 tons, less than 100 tons or 50 tons can also be counted as a batch, the same number of products must be mixed evenly. Each batch of sampling amount of not less than 0.2 tons of cement with the required dose of admixture should be fully mixed, divided into two equal parts, one according to GB8076-1997 standard methods and projects for testing; the other to be sealed and kept for six months, in case of doubt to the state designated inspection agency for retesting or arbitration, such as the production and use of unit consent, retesting and arbitration can also be sampled on site.
2. Concrete pumping agent every 50 tons of pumping agent for a batch, less than 50 tons also as a batch. Each batch of sampling volume of not less than 0.5 tons. The pumping dose of cement required and each batch of samples obtained should be fully mixed, divided into two equal parts a concrete pumping agent according to JC473-92 test; the other sealed for six months, in case of doubt to the state designated inspection agency for retesting or arbitration, such as production and use of units agreed to take the average sample on site, but should be ruled in advance in the supply contract.
3. Every 60 tons of concrete expansion agent for a batch, less than 60 tons as a batch. Sampling should be representative, can be continuous sampling, can also be taken from more than 20 different parts of the equivalent sample, the total amount of each batch of sampling not less than 10kg each batch of samples obtained should be fully mixed and homogeneous, divided into two equal parts of a concrete expansion agent (JC476-92) for testing; a sealed and kept for three months, in case of doubt to the state designated inspection Institution for retesting or arbitration.
4. Mortar concrete waterproofing agent annual output of 500 tons or more, every 50 tons for a batch; annual output of 500 tons or less, every 30 tons for a batch. The same batch of products must be uniform, each batch of sampling amount of not less than 0.2 tons of cement, the required dose of waterproofing and each batch of samples obtained should be fully mixed and homogeneous, divided into two equal parts a mortar concrete waterproofing agent (JC474-92) standards for testing; the other sealed and kept for one year, in case of doubt to the state-designated inspection agency for retesting or arbitration.
5. Concrete antifreeze the same species of antifreeze, every 50 tons for a batch, less than 50 tons can also be used as a batch. Each batch of sampling amount of not less than 0.15 tons of cement, the amount of antifreeze required (to its maximum admixture) and each batch of samples obtained should be fully mixed, divided into two equal parts a concrete antifreeze (JC475-92) for testing; the other sealed and kept for six months, in case of doubt to the state-designated inspection agency for retesting or arbitration.
6. Concrete quick-setting agent every 20 tons for a batch, less than 20 tons can also be used as a batch of each batch should be taken from 16 different points, each point to take a sample of 250g, a total of 400g, the sample will be fully mixed with each batch of samples obtained should be fully mixed, divided into two equal parts of a quick-setting agent for sprayed concrete (JC477-92) for testing; the other sealed and kept Half a year, in case of doubt to the state designated inspection agency for retesting or arbitration.