内丹功法真传《道乡集》丹法纂要（From Dao Xiang Ji Gong Dan Dan compilation method）

内丹功法真传《道乡集》丹法纂要（From Dao Xiang Ji Gong Dan Dan compilation method） 内丹功法真传《道乡集》丹法纂要(From Dao Xiang Ji Gong Dan Dan compilation method) Quality control of asphalt concrete pavement construction Li Chong 1 project overview National Road 310 line Sanmenxia city section reconstruction project full length 16km (main line). The width of subgrade design is 28.5 ~ 44m, which is two way 6 Lane highway. The pavement width is 2 x 11m, 2 x 12M, and the surface layer is designed as double deck asphalt concrete. The top layer is 3.0cm thick, and the AC 13I structure is adopted. The lower layer is 5.0cm thick and the AC 20I structure is adopted. The pavement construction has been started since 2003 March. Combined with the construction situation of the project, this paper puts forward some opinions on how to ensure and improve the quality of asphalt concrete pavement construction. 2 Mix Proportion Design Mixture ratio design is very important to the engineering quality of the road, and it is a very important index to guarantee the quality of the asphalt concrete. Composition design including aggregate, filler and additives should be moderate, but also consider other factors: temperature, traffic density and climatic conditions, the influence of the traffic, type and flow rate on the aggregate and filler and mix design plays a decisive role. Therefore, in order to ensure the quality of asphalt concrete pavement construction in more than a month before the start of the engineer's participation, by the construction unit test unit qualification, experience and good reputation of the feeding indoor mix design, at the same time by the supervision department laboratory of the same materials to do parallel test. After the two test, compared with the experimental indicators, basically consistent, can be used for production. Before construction, the hot material is screened before the mixture is mixed to check whether it meets the gradation requirements. The feed ratio of the inlet bin is adjusted to meet the design requirements of the mixing ratio, and a production mix ratio is determined. 3 emphasizes the frequency of Marshall test The construction of asphalt concrete surface can be divided into 3 parts in the quality control work, that is, indoor test, asphalt concrete mixing and pavement laying. The indoor test includes: the identification of various raw materials, the design of asphalt mixture composition, the daily inspection of asphalt, various mineral materials and asphalt mixture, and the relevant inspection of construction site. In the construction to ensure relatively uniform and asphalt content of asphalt mixture composed of small changes in the production of particles, paving and compaction to achieve higher good flatness, the most critical is the mixing quality of asphalt mixture should be high, is required to ensure the asphalt concrete with various technical indicators more stable and more stable the function of. All kinds of data measured by Marshall test directly reflect the strength, thermal stability, density, porosity and other comprehensive technical indexes of the asphalt mixture paving road. It can be said that these data reflect the final quality of asphalt mixture. The current "technical code for construction of highway asphalt pavement" (JTJ 032 - 94) stipulates that the test frequency of Marshall test is 1 times per day or 2 times per mixer. This regulation does not relate to the output per unit time of the mixer. In actual construction, according to the mixing amount of mixing machine and the change of other related factors, the testing times should be arranged according to the specific situation. Under normal circumstances, each mixer is not less than 2 times a day, the daily morning and afternoon inspection once, if the mixer daily output is higher or construction factors have changed, should appropriately increase the number of detection. In the construction process, due to leaching Green mixing the aggregate process after the initial cooling and two hot finishing with the on-site technical personnel to the standard mix of blind self-confidence, Marshall often neglect to check the test phenomenon, so that the quality of the product uniformity affected. But the related factors, single particle aggregate particle composition is likely to appear uneven phenomenon, the quality of asphalt mixture will affect, so timely and appropriate increase of mixed frequency check Marshall test of asphalt material, to ensure the production of high quality bituminous mixture is very necessary. In actual work, from the test engineer full-time in mixing station, construction and testing personnel together every time Marshall test, check the indicators, guide the mixing production, do check the screening of mix design, to ensure the material quality. 4 pay attention to the work of test section Before large-scale paving, 100~300 meters of test section should be done first. The results of the test section have practical guiding significance for the quality of the whole paving asphalt concrete. At present, the construction of rolling machinery mostly gravity compaction machinery, out of the trust of large machinery, coupled with asphalt concrete paving thin, blindly believe that more easily compacted, ignoring the test section work, this is not good. Through the test section to determine the reasonable paving coefficient, different combinations of mechanical compaction times, to achieve the optimal combination of compaction requirements, one is to ensure the quality, the two is cost savings, so it is necessary to do test work. 5 pavement compaction 5.1 degree of compaction control The construction and rolling machine of this project is heavy 18TD110 double wheel roller, heavy 26T tire roller. In order to ensure the compaction degree, the nuclear density gauge random inspection method can be used in order to ensure the compaction degree, according to the compaction degree of the reservoir after the temperature drop can not improve the recovery. In the test section, the test data measured density (density), and the Marshall ratio is the density of compaction degree of density value, according to the drill core samples are measured through the table dry compaction, obtain a linear equation detection formula of nucleon density instrument, used in other sections to achieve detection, stochastic control, guide the construction, reduce the pavement damage to. The comparison test of nuclear density meter and surface dry method for measuring reservoir compactness is shown in Table 1 and table 2. Table 1 comparison test table for measuring reservoir compaction with nuclear densimeter Number of points, pile number, point position, nuclear density meter, density reading (g/cm3) compactness (%) 1 K865+820 1# 2.314 K865+820 96.42 3# 2.141 k865+240 89.23 1# 2.214 k865+240 92.34 2# 2.212 k865+240 92.25 3# 2.312 k864+680 96.36 2# 2.180 k866+110 90.87 3# 2.295 k866+120 95.68 1# 2.298 k866+210 95.89 2# 2.341 k866+250 97.510 3# 2.197 91.5 note: 1#, 2# and 3# respectively represent the edge point, point, edge point Table 2 comparative test table for measuring the compaction degree of reservoir by dry method Number of piles, air mass (g), water quality (g), dry weight (g) density (g/cm3) the degree of compaction (%) 1 1198.92 712.08 1208.12 2.417 K865+820 100.72 849.17 473.07 858.53 2.203 91.83 K865+820 K865+240 968.67 560.01 977.36 2.321 96.74 764.32 448.18 771.91 2.361 98.45 K865+240 2 K865+240 3 912.36 549.18 930.22 2.418 100.86 818.23 463.92 826.29 2.258 K865+240 and 94.17 K864+680 939.67 529.02 948.70 2.239 93.38 1093.26 645.18 1102.42 2.391 K866+110 99.69 K866+120 1015.46 598.92 1024.87 2.384 99.310 1098.90 660.44 1108.79 2.451 102.1 K866+210. By comparison, the correlation coefficient r = 0.96, the regression equation was obtained: Y = 12.8+1.18x X: compactness measured by nuclear densimeter Y: the degree of compaction of dry process 5.2 rolling method The main goal of asphalt concrete pavement spreading and rolling is to ensure the compactness and smoothness of the pavement. The key to achieve the goal is to make the asphalt mixture rolled at proper temperature. Especially in the initial pressure stage, it should be completed as soon as possible within the specified temperature range within a short period of time. On the construction organization, to do the first mixer and paver in unit time must match the workload, which is slightly larger than the amount of mixing paving, the mixture paving in the slow, uniform and continuous conditions; secondly to do with the shop with the pressure. The rolling section method should change the previous rolling section which divides the pavement into a certain length, Let the roller press a paragraph, then move forward, rolling the next paragraph of customary practices. The segmentation method is that the roller back position basically are in a position to affect the smoothness of pavement; at the same time, a considerable amount of paving mixture can not get good timely rolling, rolling temperature decreased. The roller should be followed by the paver behind a certain distance rolling, each rolling to the paver about 5m before turning back, with the paver continues to move forward, the return position of the roller also moved forward. This not only ensures the rolling temperature, but also does not affect the flatness. During the compaction process of asphalt concrete pavement, to avoid the phenomenon of road passing, this phenomenon directly affects the compaction effect, especially the influence on pavement roughness. In the process of compaction, the pavement creep passes, so that the lower layer that is made up during the paving process is not smooth, and then appears on the surface of the compacted layer. It affects the paving of the upper layer and affects the smoothness of the road surface. In the process of pavement compaction, the reason should be found on the spot. First of all, whether it is caused by floating material or floating dust on the top of the lower layer, it is clear that floating material and floating dust should be clear in time. If not float material, and caused over the phenomenon, should immediately stop mixing, the mixture composition gradation are examined, and appropriate adjustments. The Marshall experiment was carried out in time to check the quality of the new mixture. Practice has proved that when the initial pressure is low, the pushing phenomenon is more serious. If the initial pressure is completed in a short time within 120 ~ C ~ 130 C temperature, the degree of pass can be avoided and reduced. Therefore, in this case, the initial pressure is completed in a short time at higher temperature, which is the best way to improve the quality of compaction. 6 assessment After a period of construction, how to evaluate the overall quality of asphalt concrete, especially the thickness and compaction degree of asphalt concrete. We use the method of point arrangement in the edges, middle and sides of the road marking, coring, checking the thickness, and measuring the dry density. The Marshall density of double deck asphalt concrete is calculated by weight value, the representative value of thickness and the representative value of compaction degree are obtained, and the evaluation of paving quality is made at the stage. There are many problems in improving and ensuring the quality of asphalt concrete pavement construction. This paper just puts forward our own analysis on some methods and experiences of our construction, for reference and discussion. Reviewer: Zhao Xinmin ***[JimiSoft: Unregistered Software ONLY Convert Part Of File! Read Help To Know How To Register.]***