Ruggedness Testing of the Dynamic Modulus and Flow Number Tests with the Simple Performance Tester

2008 ◽  
Author(s):  
Ramon F. Bonaquist ◽  
◽  
◽  
Keyword(s):  
Dynamic Modulus ◽  
Flow Number ◽  
Ruggedness Testing

Comparison of flow number, dynamic modulus, and repeated load tests for evaluation of HMA permanent deformation

2013 ◽  
Vol 44 ◽  
pp. 391-398 ◽  
Author(s):  
Jun Zhang ◽  
Allex E. Alvarez ◽  
Sang Ick Lee ◽  
Angela Torres ◽  
Lubinda F. Walubita
Keyword(s):  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Flow Number ◽  
Load Tests ◽  
Repeated Load

A preliminary study of the mechanical properties of asphalt mixture containing bottom ash

2008 ◽  
Vol 35 (10) ◽  
pp. 1114-1119 ◽  
Author(s):  
Shu Wei Goh ◽  
Zhanping You
Keyword(s):  
Mechanical Properties ◽  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Bottom Ash ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Test Results ◽  
Flow Number ◽  
Preliminary Study ◽  
Primary Focus

This paper shows a preliminary study of asphalt mixtures containing bottom ash with a primary focus on the permanent deformation. The objectives of this study are (i) perform literature reviews on the mechanical properties of asphalt mixtures containing bottom ash; (ii) evaluate the effects of using bottom ash as the mineral filler for the asphalt mixture through the flow number and dynamic modulus tests; and (iii) use the test results to evaluate the pavement permanent deformation using the Mechanistic–empirical pavement design guide (MEPDG) analysis. It was found that the asphalt mixture using bottom ash uses higher asphalt content due to the higher absorption. The replacement with bottom ash in the asphalt mixture generates a lower dynamic modulus as compared to the control mixtures. Additionally, results from MEPDG analysis show mixtures with bottom ash have higher rutting potential.

ANALYSIS OF SOUND SPEED IN LONGITUDINAL DIRECTION AT REFERENCE MOISTURE CONTENT (w = 12 %) IN SAWMILL ASSORTMENTS (FAGUS SYLVATICA, L.)

Akustika ◽  
2020 ◽  
pp. 45-50
Author(s):  
Alena Rohanová
Keyword(s):  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Sound Speed ◽  
Longitudinal Direction ◽  
Structural Timber ◽  
Sound Speeds ◽  
Dynamic Modulus Of Elasticity ◽  
Round Timber

This paper explores the analysis of sound speeds in the longitudinal direction and their reduction to the reference moisture content w = 12 %. The sound speed cw was determined with Sylvatest Duo device. Moisture content of beech sawmill assortments (round timber: N = 16, logs: N = 2 × 16, structural boards: N = 54) in the range of 12 – 72 % was measured. For the analysis purposes, the sound speed was converted to reference conditions (c12, uref = 12%). A second-degree polynomial (parabola) with a regression equation of the form: c// = 5649 - 27,371 × w + 0.0735 × w2 was used to convert cw to c12, and correction of measured and calculated values was used as well. The sound speeds c12 in sawmill assortments (c12,round, c12,log, c12,board) were evaluated by linear dependences. Dependence was not confirmed for c12,round and c12,board1 (r = 0.168), in contrast for c12,round and c12,log2 the dependence is statistically very significant (r = 0.634). The results of testing showed that the most suitable procedure for predicting quality of structural timber is the first step round timber – log2, the second step: log2 - board2. More exact results of the construction boards were obtained from log2 than from log1. The sound speed is used in the calculation of dynamic modulus of elasticity (Edyn). EN 408 mentions the possibility of using dynamic modulus of elasticity as an alternative method in predicting the quality of structural timber.

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