How to Identify the Quality of Cement
Brief Introduction：Cement supervision is seriously missing! Just by checking the strength, setting time and stability is not enough.
Cement quality is directly related to the quality of construction is extremely durable. It is the quality of the key points of
ready mix concrete plant.
But now the cement industry is mess: clinker nonqualified is common. Cement clinker content is far below the standard value is the norm. "Small cement" simply can not be called cement, can only be called powder abrasive. Cement supervision is seriously missing! Just by checking the strength, setting time and stability is not enough.
1. Clinker
Standard requirements, calcium silicate minerals not less than 66%, calcium oxide and silicon oxide mass ratio of not less than 2.0. Can our cement plant these indicators often qualified? Often only strength test.
2. Cement Clinker Content
Standard requirements, ordinary Portland cement clinker + gypsum content should be greater than or equal to 80%, and less than 95%. But now, even the large cement clinker content is generally only 65% -70%, not to mention all around the capital around the small cement plant (in fact, can only be called grinding station, do not know how to get the name of the cement plant) , The understanding of the general content of small cement clinker is only about 50%. Small cement can not be called cement, at best, can be called a mixture!
3. Means of Detection
Cement supervision and management by the Technical Supervision, sampling once a year, simply can not restrain the production of cement plants! National testing standards of the test items only strength, setting time and stability, coupled with a number of chemical indicators, is far from enough! Hands and feet of the small cement is easy to meet these indicators!
We should be strict clinker testing, acceptance of cement should increase the clinker content detection, should not only test the strength, setting time and stability, of course, magnesium oxide, sulfur trioxide and other chemical indicators can not be less!
