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| The mixer for soil status indicators research |
| Operators of the deviation of the aggregate volume ratio mixing index can be obtained. N samples, taken from the good mixing of concrete weighing each sample concrete weight Wc, i. Then each sample of concrete mortar washed with water, retained samples of the coarse aggregate, then known as the coarse aggregate weight wag, i. Samples in the concrete volume Vc, i and coarse aggregate volume VAG, i is calculated using the following formula: Vc, i = wc, i / cVag, i = wag, i / $ ag wherein: $ c concrete density; $ ag crude aggregate density.
The sample was the volume of the coarse aggregate ratio is calculated, considering the state of the coarse aggregate in the sample filled, such a state as to 100% of the state of the size of the coarse aggregate VPACK of i: VPACK, i = (1 -%) x Vc, i wherein: the porosity.
The Vpack i and Vag ratio of i Ci: Ci = Vag the i / Vpack and i from the N-Ci than the coarse aggregate from the design with the standard full volume ratio C0 poor ": 1Ni = 1 (Ci-C0) 2 "C0 = VagVc (1 -)-style the: VagVc design with volume ratio than the coarse aggregate. Assumes a fully separated state, Ci is equal to 1.0 or 0.0, i.e. can be pushed to the deviation of the completely separated state "0:" 0 = C0 × (1.0-C0) mixing index I is measured out of the standard deviation "and completely separated the standard deviation of the state, "the ratio of 0: I = 0 material mixing state of poor mixing index I close to 1.0; mixing in good condition, the mixing index I close to 0.0.
Mixing index determination test and the results of the test parameters in order to verify the concept of mixing index and algorithms, mixing concrete test, and measured the mixing index. Test parameters and test results in Table 1, were carried out mixing manner, mixing ratio, mixing time, coarse aggregate size, and sample size of 15 different kinds of test. Bold aggregate mixing concrete mixing plant are two ways: first, the mortar mix all the materials and put into mixing concrete; coarse aggregate volume ratio of 0.40 and 0.27 two; mixing time is five 1s to 200s; crude aggregate size divided into the average diameter 11.8,13.4 and 19.0mm three; sample size is 100, 200 and 400mL three, the number of all test samples is 30. Wherein the average diameter of the coarse aggregate: Dave = 6wk $ AG3 wherein: W sample weight; coarse aggregate number of particles out of the k sample.
The mixing time of the performance of concrete in Figure 2 for the mixing time and compressive strength of the relationship. Be seen from Figure 2, the mixing time is short, have a certain influence on the compressive strength, but little impact, the correlation is not obvious. Therefore, it can be said that, compressive unsuitable as the mixing state of the indicators.
The diagram of the mixing time and mixing index mixing time and mixing index. Figure 4 is seen that the smaller the longer mixing time mixing index growth with the mixing time, mixing index close to a certain value, it is clearly described in the mixing process of the mixture. Therefore, the mixing index can be used as indicators of the mixing state.
Boundary mixing index and the relationship of the sample size calculated in accordance with the design principles of the on-site concrete mixing plant concrete mixing plant productivity, the compulsory mixer 250L a quantity, concrete mixer shortest 14Page3 between the 60s [3], and group No. 8 ¯ 15 mixing time of 200s, 60s 3 times more that can be said, 200s can give full play to the time of the mixer mixing ability. Set 200s of mixing has reached the limits of the mixing 200s mixing index defined boundaries mixing index Ilim. Figure 5 is a after 200s Mixing (group No. 8 ¯ 15) mixing index i.e. Ilim and sample size of n. n is the average value of a sample, the number of coarse aggregate particles. Be seen from Figure 5, the close correlation between the Ilim and n, its correlation assumptions is an exponential function, Ilim and n may be expressed as the following formula: the Ilim = n-type blender capacity coefficient. Stirrer used in this study, using the least squares method can be obtained = 0.5751, and the correlation is close to 1.0, i.e. the results show, the full mixing concrete mixing index can be expressed in the above formula.
Mixers mixing capacity and mixing index as previously described, The the full mixing concrete mixing index Ilim can be expressed by exponential function, the function index blender capacity coefficient indicates the mixer's mixing boundaries. The mixer capacity coefficient and the mixing process. In the mixing process, the longer mixing time, the mixing index I is more close to Ilim = n mixer mixing ability is the higher the closer to 0.0, the boundaries of the mixing index Ilim. | | |  |
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