ghd stijltang Construction of cement concrete pave

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Construction of cement concrete pavement and analysis of attention problems

Devices will cause the road to push Yong; the road without stopping the cooling of the pressure trough opportunities arise. (4) walking on the rolling road, rolling road route properly,[link widoczny dla zalogowanych], pay attention to the wrong wheel rolling, cross-section at the exhumation at the same time, it will cause uneven road surface. (5) to determine the number of rolling, and rolling a few times is not enough, that is compact enough to form the opening track; rolled too many times, due to repeated rolling short-term focus will result in the passage of the road has been formed, the formation of cracks and waves. 2.7 seaming poor longitudinal joints and transverse joints, including joints (joint work), with joint processing defect is not prone to concave or raised seams,[link widoczny dla zalogowanych], and the joint compactness inadequate and insufficient bonding strength even loose cracks, which in the Heilongjiang Province in the past few roads built by the appearance of varying degrees. 3 Conclusion In summary, to avoid uneven asphalt pavement disease, should ensure the construction quality of roadbed, from the embankment began to attach importance to the construction preparation stage, mixture of raw materials and quality control, construction techniques and mechanical configuration, and construction workers quality of the staff, with emphasis on paving, rolling seaming construction quality in three areas, as far as possible the use of advanced machinery and equipment and reasonable allocation initiative into full play the enthusiasm of the construction workers. Received date :2006 -05-21 (continued from page 5O) to form a great influence on the larger areas should be based on the actual wind conditions to determine the kerf of time, if you do not consider the wind speed is usually too late kerf, concrete strength high cutting speed slow, cutting machine and blade damage is high. 2 Discussion and Analysis 2.1 mixing cement concrete mixing concrete directly affects the quality of the intrinsic quality of concrete,[link widoczny dla zalogowanych], the concrete impact of the quality of the flatness of the road. We have the factors affecting concrete slump and automatic compensation device gravel proper use of water both for analysis. 2.2 The main factors affecting concrete slump (1) level with the impact of change on the concrete slump is great, the water and cement on an equal volume of aniseed and fine materials and packages have a very different rate such as water and water-cement ratio in the same case of fines is much less than the coarse material of concrete slump concrete slump, so the production process of concrete mixing barn feeding to aggregate as much as possible to keep all the time position is relatively stable aggregate gradation, grading to ensure the coordination of concrete set. (2) the change of water content of concrete slump is evident, the general mixing of the water changes the water balance can be intuitively understood, but changes in water content of sand in the large impact of the slump of concrete is very clear This is enough attention has been the builder. However, large areas or in the rain after the rain, the slump is not controlled. Therefore, the production process in the mixing should be measured about the moisture content of aggregate in the water balance should be deducted the amount of water to get desired results. (3) Cement temperature on slump of concrete construction workers are often overlooked, such factors are often large production capacity in the single mixing station 52 * occur, because the general cement silo only about 100 ~ 150t,[link widoczny dla zalogowanych], generous amount of mixing more cement volume stations, sometimes side to side of the production of cement tank hit the cement, and sometimes do not cool down the cement began to stir, not only to produce the concrete temperature is higher,[link widoczny dla zalogowanych], and the slump because of high temperature cement , absorbing a larger and smaller. (4) water and cement scale weighing scale deviation of the slump of the concrete is great, if the water and cement scale weighing scale deviation is stable, the operation may be based on the amount of actual weight. If this deviation is unstable, especially water flow measurement method used mixing stations, water metering error is larger and unstable, and therefore difficult to control the slump. (5) the amount of additives are also important factors affecting concrete slump, the present greater because the amount of additives, and thus the amount of additive amount of work directly on the slump. Do not use the additives used excessive. Although it can reduce the amount of water, it will make concrete some of the excessive use of physical and chemical properties changed greatly. Where the specific production process, the amount of water-reducing agent should be relatively stable, will play a larger role. Automatic moisture compensation device 3 gravel proper use of water in the use of automatic compensation device has a misconception that automatic measurement indicator shows the percentage of sand in the water content is. The main reason is to see a lack of understanding of understanding of the principles this device to the proper use of automatic water cut compensation device, you must re-test before each use the actual water content of sand and gravel, and so adjust the indicator on the display. Automatic measurement compensation device to work properly, accurate compensation, the slump of concrete will be well controlled. Received Date: 2oo6-05-21
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