trong l p k t c u b ng PP ộ ẩ ố ượ ủ ấ ớ ế ấ ằ rót cát 22TCN – Đ b ng ph ng ườ ằ ầ kelman 22TCN – Thí nghi m xuyên tiêu chu n (th nghi m SPT) . 06 Ao duong mem chÕ bÞ ®óng víi tr¹ng th¸i Èm nhiÖt bÊt lîi hoÆc ¸p dông hÖ sè quy ®æi vÒ mïa bÊt lîi theo tiªu chuÈn ngµnh 22 TCN 22 TCN TECHNICAL STANDARD FOR ROAD MAINTENANCE AND REPAIR, Issued under Decision No QDBGTVT dated 28 May of.
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Type of embankment and pavement on moisturizing conditions, state of drainage, status of pavement surface, structure of pavement, type of the top soil, traffic volume and so on These figures will be obtained in reference to the road documents at road management agencies and data collected by site investigation carried out by experienced expert teams refer to Appendix A ; 5.
When measuring the pavement deflection, not measure at positions where the pavement are considerably damaged such as: So as to adjust results of deflection measurement for calculated temperatures later, it is a must to measure the ambient air temperature and pavement temperature for once in hour during deflection measurement along the pavement Measurement of the pavement temperature is only required for pavement structure with the asphalt top layer thickness is 5cm or more This is how to measure the pavement temperature: Traffic safety organization may be arranged by using barrier, traffic signs in combination with person holding traffic control flag Processing deflection measurement results 6.
Li refers to the pavement deflection measured at the i test spot regardless of other effects by the truck loading, unfavorable season and the pavement temperature, unit in mm; Kq means the coefficient of measurement results adjustment by parameters of the rear axle of the test truck to the results of standard truck rear axle Kq is calculated by formulae: Ldt is typical rebound deflection for each test section; Ltb pertains to average deflection of the test section, in mm Value Ltb is calculated by below formulae: K is the probability factor taken upon grade and class of road, to be determined as below: Name and address of the Laboratory: Kilometer 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 Cross section – Left side 1.
This work is implemented in several years Every one, to measure in the same day, in the morning and when the pavement have highest temperature about pm — How to measure: Measurement of deflection in fixed observatory points is similar to that for test spots along the pavement including measuring pavement temperature in testing During test in measurement points, special attention should be paid to placement of test vehicle wheels within the circle marked on the pavement surface — Processing of results after measurement: Using statistical analysis method of deflection measurement data to determine the most unfavorable season in a year, deflection adjustment factor to the most unfavorable season in year Km and deflection adjustment factor at measured temperature to calculated temperature Kt D.
We may take the most unfavorable season in year of the road passing by localities as in Table D. To determine Km as below: Embankment is not frequently submerged, underground water level is 1.
Low embankment, narrow shoulder filled with clayed sand soil to be poorly compacted, with regular underground water, poor surface water drainage and under effect of underground water Pavement structure has water-permeable surface layer, base is 25198 Seasonal conversion factor K m may be taken from Table D.
Deflection adjustment factor at measured temperature ToC to calculated temperature at C by this formulae: Determine deflection adjustment factor at measured temperature T oC by the following formulae: Kt 10 is deflection adjustment factor at measured temperature ToC to 10oC ; K30 10 refers to deflection adjustment factor at 30oC to 10oC Kt 10 and K30 10 is determined by monograph in Figure D.
Calculate comparative value by this manner: Textbook evaluation an investigation into vectory 01 0 0.