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| Study on Quality Control of Graded Broken Stone for Railway Subgrade Engineering |
| TANG Wen － jun |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China |
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Abstract Research purposes:The filling test with graded broken stone was done for the Tianjin － Qinhuangdao Passenger Dedicated Line to solve the problems of influencing the quality of the subgrade by the material，gradation，mud content，cement content and compactness of graded broken stone． The analysis and research were made and done on the key reasons and points for influencing the quality of the subgrade．The specific measures were presented for avoiding the appearance of the quality problem，potential safety hazard and subgrade diseases． The study presented in this paper has a guiding significance for design of the railway graded broken stone and control of construction quality．
Research conclusions: The gradation of graded broken stone must satisfy the technical requirements． The stone should be washed and the fine particles below 0.075 mm should be screened out during construction．The quality control index should include the unconfined compressive strength in different age and different dosage，the freeze thawing，the permeability，the resilience modulus，the shrinkage and the fatigue，and all these indexs should increase before and after the construction．The plain concrete can be made of the graded broken stone with cement，and this construction method is mature． The plain concrete strength should be designed as C25 to keep enough stiffness and prevent freezing damage．But the concrete grade should not be too high and its volume should not be too big in order to avoid the high cost of the high grade and mass concrete with being easy to crack．
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Received: 07 January 2013
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2013, Vol. 30 
