Research Of Cement Granules' Appearances And Their Matches In Industry

From the problem existing in China's cement at present, this thesis pointed out that the cement granules' appearance and the granules' matches is one of the reasons which lead to China's cement being imperfect. Based on the powder theory, this thesis has probed into the influence of some factors on the properties of cement and its functions in the concrete. The factors are as follows: the cement granules' appearance, the size of the granule, the content of fine granules and the granules' matches. Experiments in the laboratory and in the middle scale have been carried out in Inner Mongolia Melic Sea High-tech materials Co., Ltd (IMMSHTCT) by using two kinds of high-performance cements with low alkali named 425#. Good results were obtained. The performances of the concrete, such as anti-press intensity, dry shrinking performance, grinding resistance, intensity from beginning to the end and the wear properties has arrived at a high level. The cost of the cement has also been reduced properly. The results have been used in the IMMSHTCT industry, good economic benefit and social benefit have obtained.According to the laboratory results, when the range of additions is 30-35%, the range of specific surface is 480-520m2/kg, the fineness is 0.080mm, the tail-over is 1.5%, then the degree of flowing and intensity of cement have been increased greatly. Experiments in the middle scale have proved that when the distribution of granules that below 30um is over 80%, intensity from beginning to the end will be increased. The higher the roundness degree of cement's granules is, the better the fluidness of the cement will be. When the ratio of water and cement is 0.44, the average offluidness of the cement is over 130mm.Industrialized manufactures have been carried out according to the experiments in the laboratory and in the middle scale. Two kinds of cements of Ml and M2 that have additions were obtained. Results of check are as follows: the intensities of cement water mortar have exceeded the state standards, especially the early intensity is obvious; physical and chemical properties of cement such as the value of hydrating thermal, the content of SO3 and the content of alkali have also exceeded the state standards, especially the specific surface (547m2/kg and 571m2/kg) and the tail-over (1.4% and 1.0%) exceeded the state standards greatly, this shown that the cements contain many fine granules. The investigation of the granules distribution shows that the range is narrow; the range of granules between 0-32(im is 95%. This indicated that the granules' matches are fine. The average value of the roundness degree of cement's granules is much high by the XD5 image meter and SEM.Results of applying Ml and M2 into the concrete are as fellows: the adaptability between cement and additives is fine; performances of the concrete, such as intensity, waterproof, the degree of collapse, the expanding degree of collapse, the content of water, the presentation of water, the time of coagulation, dry shrinking performance, grinding resistance, and the properties of anti-freezing and the properties of lasting have arrived at the level required by high-quality commercial concretes.The additions of the two kinds of cements are industry waste residues, such as slag, scoria and coal slag. When put these additions into cements that have fine granules' appearance and fine granules' matches, not only the properties of cement has been enhanced, the cost of the it has also been reduced. Meanwhile, the problem of pollution of industry waste residueshas also been solved. Good economic benefit and social benefit have obtained.