The Application Experimental Research On The Real-time Compaction Detection Technique

Vibratory rollers, with its good compaction effect, has played an important role in highway construction. In order to further improve the compaction quality and efficiency, overcome the disadvantages of traditional compaction quality detection and control mode, real-time compaction detection technique, which is based on interaction dynamic characteristic changes between roller and compacted material, obtained much concern in recent years. The abroad keep ahead in application research of this technology, the domestic research is mainly focused on product development, less practical application research. The compaction detection value of Real-time Compaction Detection Instrument is the numerical degree reflection of compaction effect and layer close-grained degree, roller mechanical parameters, material characteristic parameters and compaction process parameters has a direct relationship with the compaction detection value. To solve the problem of the engineering application, shall the accuracy, influence factors, application conditions and application solutions were tested.Vibration roller acceleration signal contains various information of compaction process, there are certain relationship between acceleration signal characteristics change and layer compaction degree change. Acceleration signal characteristics also reveals the causes of jumping vibration working mechanism in certain extentThe accuracy of the compaction detection value R verifying experiments indicate that, on the circumstances of vibratory rollers work parameters reasonable and stability, layer material characteristic parameter variation little, there is a significantly linear correlation relationship between compaction detection value R and sand replacement method compaction, compaction detection value R is a true reflection of layer materials compaction condition.Vibration compaction is a complicated interactions process between vibratory rollers and material, roller frequency, amplitude, rolling speed, layer material type, granular composition, water content, thickness and so on is the important factor affects compaction effect. These parameters construction process are also inevitable fluctuate. This paper experimental research shows that frequency wave less than 1%, rolling speed fluctuation less than 0.5%, compaction detection value can be more accurately reflects compaction condition of material and some changes in granular composition or water content. Technician can better control compaction process according to the information reflecting by compaction value.Through calibration with sand replacement method, or according to the compaction value increment, the driver can judge the new layer is completed compaction or not; According to kinds of compaction information, through reasonable adjustment roller working parameters and reasonable control material characteristic parameters, compaction quality process control can realize.The result of this paper is a summary of some highways construction site experiment, field application shows that using Real-time Compaction Detection Instrument can assist drivers better judgment layer compaction condition, avoid overcompaction and less compaction, improve the compaction quality and efficiency.