nlwxpearo
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 Posted: Thu 23:14, 16 Dec 2010 Post subject: High alumina cement refractory concrete analysis o |
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High alumina cement refractory concrete analysis of factors affecting performance
Show that, although the amount of cement increased, but intensity of growth is not obvious, and indeed the increase in coarse aggregate strength significantly increased, from 8 to 9, with the ratio of view, three-day compressive strength reached 27.2MPa, 25.4MPa. Fine aggregate concrete in the fire too much, aggregate surface area increases, the water-cement ratio will increase content of cement and powder should be increased, affecting the performance of fire-resistant concrete,[link widoczny dla zalogowanych], ~ as the ratio of aggregate thickness of 40 60, fire-resistant aggregate rate of frequency control of particle size distribution of sand between 0.45-0.55. The aggregate refinery built 703-77 as particle size gradation weight ratio (%) (mm) measured spray painting construction material dumped 5-2.5l7 ~ 23l4 ~ 20l72.5 a 1.222 ~ 2818 ~ 24 ¨. 1.2-0.337 ~ 4339 ~ 4542.750.3l2 ~ l8l7 ~ 2823.25 bauxite refinery built in wear-resistant layer of dry strength required to reach 105 ℃ 30.0MPa, mainly increased aggregate surface area too small large, so that the combined cement and powder up to about 35%. Therefore, the compressive strength of 30.0MPa 105 ℃ drying is unattainable. And aggregate gradation, grading and production plants to combine the classification that is not easy to produce without too much help construction management, project quality difficult to control, so the correct choice of the rational aggregate gradation. 5. Pi health conditions on the ring temperature strength of high alumina cement refractory concrete, environmental health and temperature conditions, the strength at room temperature is a more _ a big impact, mainly due to high alumina cement is a rapid hardening, high early strength, the three day limit is reached, and the heat of hydration of 80 released in about l0 hours, 24 hours after the release of heat of hydration has been very small. The environment is the right temperature is controlled at l5 ℃ ~ 25 ℃, when higher than 25 ℃,[link widoczny dla zalogowanych], cooling measures should be taken, otherwise a lot of hydration heat release, it will cause fat cakes can not use concrete. . A 3l a sulfuric acid plant from the transformation of this 101 200 roaster dome high alumina cement refractory concrete strength reached only about 10% of the design to see the importance of health conditions. Forming four-site test block, pressure test results of pressure test date creation date table below normal temperature strength MPa83.8.889.8.121.871.92.12,,,, 2.32.12. u, 89.8.1089.8.141.661.31.76,,,, 1.66 · 1.921.24 cement through recovery mandarin duck, the factory date 6 March l2,[link widoczny dla zalogowanych], 88 years beyond the effective high alumina cement storage period, managed to reach 325 by the laboratory of cement, and some hardening of Pat-caking. But the concrete in the project about the construction on August 4, when the temperature reached 3O ℃ above, the manager field determination of the actual spring back to zero. Win sulfuric acid resistant layer lining the scene forming the cement specimen, the water did not enhance health, once the required sprinkler l5 minutes, although the capacity of Xia in 2000 kg / cubic meters,[link widoczny dla zalogowanych], but the l05 ℃ strength of 14.0MPa, 750 ℃ strength is 13.0MPa, reached only about 5O%. Therefore, high alumina cement refractory concrete, must control the environment, health} a temperature l5 ℃ 25 ℃, watering every other health question in the first three days l5 minutes to make concrete in wet state of health, in order to achieve good temperature strength. Third,[link widoczny dla zalogowanych], the high alumina cement refractory concrete construction elements 1. Of raw materials, you must retest site index, so the material does not station grid, resulting in the quality of the accident. 2. High alumina cement refractory concrete in the mix, both design and specifications provided only as a reference mix, must be based on the raw materials used in construction, in the re-examination based on the mix made by the laboratory to guide the construction site . 3. On-site laboratory to provide the theory must be based on accurate measurement of the ratio mix, and a detailed record of the construction of stirring, the scene can not be with: changes in the volume mixing ratio, otherwise it will affect the performance of high alumina concrete. 4. Concrete construction site, must follow the regulations of environmental health and in three days so that the temperature is always in the wet concrete state of health. 5. Facilities in the winter i, with Cattle construction method, using steam spray regimen is strictly prohibited. Schedule L series with No. MPa compressive strength than% plus water, cement powder aggregate 105 ℃ 750 ℃ 116147011.6419.1318.57 ...,-214167011.4322.9324.3315157011.6728.027.14101070l1.6713.4l2 .1 from the above mix, ideally with 3t I: L, the best indicators of cement increases, the drying intensity was, the lower the residual deformation increases. Therefore, the powder and the ratio of cement and aggregate, is equal to 30:70 is reasonable. A 32 -
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