Fatigue Performance of Cement-Stabilized Crushed Gravel Produced Using Vertical Vibration Compaction Method

2020 ◽  
Vol 32 (11) ◽  
pp. 04020318 ◽  
Author(s):  
Yingjun Jiang ◽  
Kejia Yuan ◽  
Changqing Deng ◽  
Tian Tian
Keyword(s):  
Vertical Vibration ◽  
Fatigue Performance ◽  
Vibration Compaction ◽  
Compaction Method

scholarly journals Investigation on cement-improved phyllite based on the vertical vibration compaction method

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247599
Author(s):  
Yingjun Jiang ◽  
Jiangtao Fan ◽  
Yong Yi ◽  
Tian Tian ◽  
Kejia Yuan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Static Pressure ◽  
Cement Content ◽  
Vertical Vibration ◽  
Pressure Method ◽  
Vibration Compaction ◽  
Modulus Of Resilience ◽  
Compaction Method

The vertical vibration compaction method (VVCM), heavy compaction method and static pressure method were used to form phyllite specimens with different degrees of weathering. The influence of cement content, compactness, and compaction method on the mechanical properties of phyllite was studied. The mechanical properties of phyllite was evaluated in terms of unconfined compressive strength (Rc) and modulus of resilience (Ec). Further, test roads were paved along an expressway in China to demonstrate the feasibility of the highly weathered phyllite improvement technology. Results show that unweathered phyllite can be used as subgrade filler. In spite of increasing compactness, phyllite with a higher degree of weathering cannot meet the requirements for subgrade filler. With increasing cement content, Rc and Ec of the improved phyllite increases linearly. Rc and Ec increase by at least 15% and 17%, respectively, for every 1% increase in cement content and by at least 10% and 6%, respectively, for every 1% increase in compactness. The higher the degree of weathering of phyllite, the greater the degree of improvement of its mechanical properties.

scholarly journals Cement-Modified Loess Base for Intercity Railways: Mechanical Strength and Influencing Factors Based on the Vertical Vibration Compaction Method

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3643
Author(s):  
Yingjun Jiang ◽  
Qilong Li ◽  
Yong Yi ◽  
Kejia Yuan ◽  
Changqing Deng ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
High Speed ◽  
Cement Content ◽  
Vertical Vibration ◽  
Initial Growth ◽  
High Speed Railway ◽  
Growth Properties ◽  
Vibration Compaction ◽  
Growth Equations ◽  
Compaction Method

Cement-modified loess has been used in the recent construction of an intercity high-speed railway in Xi’an, China. This paper studies the mechanical strength of cement-modified loess (CML) compacted by the vertical vibration compaction method (VVCM). First, the reliability of VVCM in compacting CML is evaluated, and then the effects of cement content, compaction coefficient, and curing time on the mechanical strength of CML are analyzed, establishing a strength prediction model. The results show that the correlation of mechanical strength between the CML specimens prepared by VVCM in the laboratory and the core specimens collected on site is as high as 83.8%. The mechanical strength of CML initially show linear growth with increasing cement content and compaction coefficient. The initial growth in CML mechanical strength is followed by a later period, with mechanical strength growth slowing after 28 days. The mechanical strength growth properties of the CML can be accurately predicted via established strength growth equations. The results of this study can guide the design and construction of CML subgrade.

scholarly journals Influencing Factors and Prediction Model for the Antierosion Performance of Cement-Improved Loess Compacted Using Different Compaction Methods

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Kejia Yuan ◽  
Yingjun Jiang ◽  
Luyao Cai ◽  
Jiangtao Fan ◽  
Changqing Deng ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Prediction Model ◽  
Mass Loss ◽  
Influencing Factors ◽  
Cement Content ◽  
Vertical Vibration ◽  
Design Criteria ◽  
Strength Deterioration ◽  
Vibration Compaction ◽  
Compaction Method

To analyze the antierosion performance of cement-improved loess (CIL), several influencing factors have been investigated based on two different compaction methods, which include the quasi-static compaction method (QSCM) and the vertical vibration compaction method (VVCM). Then, a prediction model for the cumulative erosion mass loss (CEML) has been established. The effects of erosion on the strength deterioration of CIL were also studied. The results show that, compared with QSCM, specimens compacted using the VVCM have better antierosion performance. As the cement content and the compaction coefficient are increased by 1%, the antierosion performance is increased by 16% and 6.2%, respectively. The eroding time has a significant effect on the antierosion performance of CIL, and the CEML increases linearly with an increase in the eroding time. The compressive strength of CIL decreases significantly due to erosion, and based on the average deterioration degree of the specimens, the design criteria for strength of CIL are proposed, which can provide reference for the design of CIL.

scholarly journals Characterization of Properties of Soil–Rock Mixture Prepared by the Laboratory Vibration Compaction Method

2021 ◽  
Vol 13 (20) ◽  
pp. 11239
Author(s):  
Xiaoping Ji ◽  
Honglei Lu ◽  
Cong Dai ◽  
Yonggen Ye ◽  
Zhifei Cui ◽  
...  
Keyword(s):  
Particle Size ◽  
Static Pressure ◽  
Resilient Modulus ◽  
Field Tests ◽  
Field Measurements ◽  
Maximum Particle Size ◽  
Vibration Compaction ◽  
Maximum Particle ◽  
Compaction Method ◽  
Properties Of Soil

This paper presents a study of the properties of soil–rock mixtures (SRM) prepared by the vibration compaction method. First, the results of laboratory experiments and field tests are compared to determine the reasonable parameters of the vibration compaction method (VCM) for soil–rock mixtures. The compaction characteristics, CBR, and resilient modulus of the laboratory-prepared soil–rock mixtures by the static pressure compaction method (SPCM) and vibration compaction method are compared. The effects of the soil to rock ratio and the maximum particle size and gradation on the compaction characteristic, resilient modulus and CBR of soil–rock mixtures prepared by the vibration compaction method are investigated. Finally, field measurements are subsequently conducted to validate the laboratory investigations. The results show that the reasonable vibration frequency, exciting force, and static surface pressure of the vibration compactor for soil–rock mixtures are recommended as 25 Hz, 5.3 kN, and 154.0~163.2 kPa, respectively. Soil–rock mixtures prepared by vibration compaction method has smaller optimum water content and gradation variation and larger density than specimens prepared by the static pressure compaction method, and the CBR and resilient modulus are 1.46 ± 0.02 and 1.16 ± 0.03 times those of specimens prepared by the static pressure compaction method, respectively. The ratio of soil to rock, followed by the maximum particle size, lead obvious influences on the properties of soil–rock mixtures. Moreover, the results show that the CBR and resilient modulus of soil–rock mixtures prepared by vibration compaction method have a correlation of 86.9% and 89.1% with the field tests, respectively, which is higher than the static pressure compaction method.

Experimental Study on the Compaction Characteristics of Chloride-Based Weak Saline Soil

2012 ◽  
Vol 512-515 ◽  
pp. 3024-3032 ◽  
Author(s):  
Jun Yong Liu ◽  
Liu Jun Zhang ◽  
Biao Ding
Keyword(s):  
Experimental Study ◽  
Saline Soil ◽  
Technical Problems ◽  
Compaction Characteristics ◽  
Fine Grained ◽  
Optimum Water Content ◽  
Vibration Compaction ◽  
Compaction Method ◽  
Optimum Water ◽  
Standard Density

In order to solve the technical problems of fine-grained weak saline soil subgrade compaction, combing with Qarham to Golmud highway project, this paper studied the compaction characteristics of the weak saline soil by experiment, determined the optimal vibration-compaction parameters, and compared with the compaction effect that relevant criterions proposed. The results show that vibration-compaction can make the soil fully compacted and compaction effect is better. Suggestion: it is best to adopt the vibration-compaction method to determine standard density and optimum water content.

scholarly journals Laboratory Evaluation of a Vertical Vibration Testing Method for an SMA-13 Mixture

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4409
Author(s):  
Yingjun Jiang ◽  
Jiangtao Fan ◽  
Jinshun Xue ◽  
Changqing Deng ◽  
Yong Yi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Heavy Traffic ◽  
Asphalt Mixture ◽  
Vertical Vibration ◽  
Laboratory Evaluation ◽  
Vibration Testing ◽  
Testing Method ◽  
Vibration Compaction ◽  
Compaction Time

In order to simulate the on-site compaction conditions of a Stone Matrix Asphalt (SMA) mixture, The Vertical Vibration Testing Method (VVTM), Superpave Gyratory Compactor (SGC), and Marshall method are used to test the SMA-13 mixture, and the physical and mechanical properties of the asphalt mixture designed by these three methods are tested. Subsequently, the influences of the molding method on the mechanical properties are compared. The influence of vibration compaction time on the volume parameters of the SMA mixture is studied. Following the heavy traffic compaction standards, the vibration compaction time of the SMA mixture is determined. The results show that the densities of the heavy Marshall specimen, VVTM specimen, and SGC specimen are 1.018 times, 1.019 times, and 1.015 times greater than that of the standard Marshall specimen, respectively. The passing rate of the 4.75 mm aggregate of the standard Marshall specimen is 29.9%, and that of the VVTM specimen and SGC specimen is 31.1% and 30.5%, respectively, while that of the heavy Marshall specimen is 34.5%. The mechanical strength of the specimen can be greatly improved as the density increases. On the other hand, by the same compaction work, the mechanical strength of the VVTM specimens can be increased by at least 7% compared with the heavy Marshall specimen. The mechanical strength of the VVTM specimen is increased by at least 22% compared with the standard Marshall specimen. The results also show that under the optimal asphalt-aggregate ratio and the same compaction work, the compressive strength and shear strength of the VVTM specimens are increased by at least 6% and 9%, respectively, compared with the Marshall specimens. In summary, the performance of the asphalt mixture designed by the VVTM is superior, providing a wider choice for future asphalt mixture design.

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