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a. Common cement includes: Henan Daswell Machinery Co., Ltd,is a professional manufacturer and trader specializing in the research, development and production of construction machinery for nearly 30 years. Our main products are as follows:mobile block making machine, concrete batching plants,concrete mixer,blocking making machine,concrete pump,etc. Portland cement, ordinary portland cement, slag cement concrete pumping, pozzolana Portland cement and fly ash cement b. Setting time of cement Initial setting time shall not be earlier than 45min, final setting time not later than 10h. Portland cement final setting time is not later than 6.5h. c. How to choose cement According to cement characteristics, requiring early strength concrete works, should use portland cement or portland cement concrete works on the general machine, should use slag cement. d. Precautions for use of cement 1) Cement entering factory needs to be checked and then accept, there must be factory certificate or admission test report. 2) Storage time is too long or wet cement can be used to go through trials. Starting at the date of manufacture of cement, more than three months should be considered expired cement. 3) Different varieties of cement can not be mixed. Cement of the same species, a different level of intensity gap is too long or the date of manufacture of cement can not be mixed. Concrete batching plant is strict to cement, because only good cement can mixing good concrete for construction site.
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