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Posted: Fri 5:39, 17 Dec 2010 Post subject: cheap ghd hair Ordinary concrete mix design _1333 |
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Ordinary concrete mix design of several problems
Longer time before the water), other cell filter is overloaded, affecting water quality and anti-7 = wash Sort blocked. 7 Suggestions (1) in the production practice of high-density groups were set to clarify the pool of coagulant and PAM dosage rate, or two to clarify the pool of high-density sampling and were set SCD and their respective control signal feedback to vote metering pumps dosage to obtain better treatment results. (2) to clarify the pool control program of high-density sludge level meter to increase the lag time for feedback from mud, the sludge layer height of the actual sludge level to meet the design and then mud, mud in advance to avoid. (3) an increase in the filter backwash control program before the time control to filter through the time setting and level with the control before the filter backwash time. References [1] Xu Bao Jiu. Water Science and Engineering Theory Series A water treatment theory. Beijing: China Building Industry Press, 2000 [2] 聂梅生,[link widoczny dla zalogowanych], Qisheng Hao, Shi Yan Xu, et al. Water Industry Engineering Design Manual for a water resources and water treatment. Beijing: China Building Industry Press, 2001 (Continued from page 54) inspection and evaluation of concrete strength, often using statistical methods (unknown variance) and non-statistical methods. According to \The following combination of statistical methods (unknown variance) conditional eligibility determination [2] and [3] for analysis. mfc a 1SfcI> 0.9fcu. k [2] fo ... 'n ≥ 2fou-k [3] where: m a n set of the average strength of specimens (N / ram); Sfoo-n group standard deviation of the strength of the specimen (N / mm), When s is less than 0.06fcu. k, take Sfc = 0.06fo. k;, h2 a qualified coefficient of determination in Table 4 access; concrete strength standard deviation (N / mm); foo, k values of a standard concrete cube compressive strength (N / mm). Table 4, coefficient of determination, strength of concrete specimens of qualified group of numbers 10 ~ 14l5 ~ 24 ≥ 251l_701.651.6o20. O0.85 we can see from the evaluation criteria, s depends on the construction unit of the management level, the level of good, is small, otherwise large; m value is also qualified fluctuate with changes in sh. . . An infinite set of samples representative of the average intensity, m is the grant acceptance on behalf of a (finite group) the average strength of test piece, fe. . And m between the two is quite certain extent,[link widoczny dla zalogowanych], but, and Sfo, can be the same. Take fo. = 40.0. = 1.65,: = 0.85, Sfcu == 2.4 were substituted into the [1], [2] and [3], we obtain: mfc> 140.0, fo. 0I> 44.0, fo ... i ≥ 34.0. That is, when control of the construction unit when S = 2.4, CA0 batch of concrete strength to achieve acceptance mfc = 40.0, fc ... = 34.0 can be determined as compliant with strength of concrete test at this time fo. 0 = 44.0 (MPa) will meet the requirements. When = 6.0, fo. k = 40.0 Eq [1] was. 0 = 50.0 (MPa), the value of 44.0 (MPa) difference of 6.0 (MPa). Thus, during the concrete mix design,[link widoczny dla zalogowanych], construction units should be combined with management and the actual conditions of the construction site,[link widoczny dla zalogowanych], the key to reasonably determine the size of the anomaly, the premise of guaranteeing quality, creating benefits to achieve the purpose of saving cement. (Non-statistical methods for the analysis of similar statistical methods, the paper will not repeat them) 2 conclusion in the use of \Meanwhile, the terms of the standard should be properly understood and accurately applied. In the testing process, should create conditions for elimination of negative factors, to ensure the test results of science and justice. This combination of testing experience on these issues were discussed, and their views,[link widoczny dla zalogowanych], aims and common progress, if improper, hope peer criticism correction. References [1] \87) [4] \order \ More articles related to topics:
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