Laboratory Investigation of Seasonal Variations in Resilient Modulus of Alaskan Base Course Material

2010 ◽  
Author(s):  
Lin Li ◽  
Juanyu Liu ◽  
Xiong Zhang ◽  
Stephan Saboundjian
Keyword(s):  
Laboratory Investigation ◽  
Seasonal Variations ◽  
Resilient Modulus ◽  
Base Course Material ◽  
Course Material ◽  
Base Course

Resilient Properties and Fatigue Damage in Stabilized Recycled Aggregate Base Course Material

1998 ◽  
Vol 1611 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Khaled Sobhan ◽  
Raymond J. Krizek
Keyword(s):  
Elastic Modulus ◽  
Fly Ash ◽  
Fatigue Damage ◽  
Damage Accumulation ◽  
Resilient Modulus ◽  
Recycled Aggregate ◽  
Fiber Reinforced ◽  
Base Course Material ◽  
Course Material ◽  
Base Course

A stabilized fiber-reinforced base course material composed largely of recycled concrete aggregate with small amounts of portland cement and fly ash was subjected to repeated flexural loading to evaluate its resilient properties and progressive accumulation of fatigue damage. Cyclic load-deformation data were recorded continuously during the entire fatigue life until fracture to determine ( a) the magnitude and variation of cumulative plastic strain and dynamic elastic modulus as a function of the number of loading cycles, ( b) a range for the resilient modulus, and ( c) the effect of fiber inclusions on the dynamic material properties and rate of damage accumulation. The extent of fatigue damage was calculated as a fatigue damage index, which is based on the cumulative energy dissipated (absorbed) during cyclic loading. All beam specimens used in this experimental program contained (by weight) 4 percent cement, 4 percent fly ash, and 92 percent recycled aggregate; the fiber-reinforced specimens contained an additional 4 percent (by weight) hooked-end steel fibers. Results show that the resilient modulus in flexure varies between about 2.75 GPa (400,000 lbf/in2.) and 10.4 GPa (1.5 million lbf/in.2) and the degradation of the dynamic elastic modulus does not exceed 25 percent of the initial modulus. Miner’s Rule of linear summation of damage is applicable to unreinforced material but not to fiber-reinforced material. In general, a modest amount of reinforcing fibers was very effective in retarding the rate of fatigue damage accumulation in this lean cementitious composite.

scholarly journals Effect evaluation of freeze-thaw on resilient modulus of unsaturated granular base course material in pavement

2019 ◽  
Vol 21 ◽  
pp. 100284 ◽  
Author(s):  
Tatsuya Ishikawa ◽  
Tianshu Lin ◽  
Shinichiro Kawabata ◽  
Shuichi Kameyama ◽  
Tetsuya Tokoro
Keyword(s):  
Resilient Modulus ◽  
Effect Evaluation ◽  
Freeze Thaw ◽  
Base Course Material ◽  
Course Material ◽  
Base Course ◽  
Granular Base

The use of tangent stiffness to characterize the resilient response of unbound crushed aggregates

2006 ◽  
Vol 43 (11) ◽  
pp. 1117-1130 ◽  
Author(s):  
J -M Konrad
Keyword(s):  
Granular Material ◽  
Resilient Modulus ◽  
Stress Path ◽  
Threshold Value ◽  
Vertical Stress ◽  
Tangent Stiffness ◽  
Base Course Material ◽  
Course Material ◽  
Base Course ◽  
Resilient Response

Repeated-load triaxial tests were conducted on crushed granitic base-course material to study the resilient response under different stress paths and compaction states. It has been established that the resilient response of this prestrained unbound granular material is best defined in terms of tangent stiffness (Et) and vertical stress (σv). The data also revealed the existence of a threshold value of tangent stiffness that is essentially dependent on initial confining stress for a given compaction state. When the tangent modulus exceeds this threshold value, a unique relationship between tangent stiffness and vertical stress exists for mobilized shear resistance ratios less than 0.4. This Et–σv relationship is independent of stress path. A simple power law model can be used to predict the resilient response of unbound base-course material and an approximate value of resilient modulus for any desired stress path and initial stress condition. The use of the tangent stiffness – vertical stress model for pavement design appears to be very promising.Key words: granular, material, resilient modulus, triaxial, stress path.

scholarly journals EFFECT EVALUATION OF FREEZE-THAW ON RESILIENT MODULUS OF UNSATURATED GRANULAR BASE COURSE MATERIAL

2013 ◽  
Vol 69 (3) ◽  
pp. I_207-I_214 ◽  
Author(s):  
Tatsuya ISHIKAWA ◽  
Yuan ZHANG ◽  
Shinichiro KAWABATA ◽  
Shuichi KAMEYAMA ◽  
Tetsuya TOKORO
Keyword(s):  
Resilient Modulus ◽  
Effect Evaluation ◽  
Freeze Thaw ◽  
Base Course Material ◽  
Course Material ◽  
Base Course ◽  
Granular Base
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