Investigation of the Relationship Between Field Performance and Laboratory Aging Properties of Asphalt Mixtures

2009 ◽  
pp. 3-3-18 ◽  
Author(s):  
JE Kliewer ◽  
CA Bell ◽  
DA Sosnovske
Keyword(s):  
Field Performance ◽  
Asphalt Mixtures ◽  
Aging Properties ◽  
The Relationship

Device for Measuring Shear Resistance of Hot-Mix Asphalt in Gyratory Compactor

2000 ◽  
Vol 1723 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Murat Guler ◽  
Hussain U. Bahia ◽  
Peter J. Bosscher ◽  
Michael E. Plesha
Keyword(s):  
Hot Mix Asphalt ◽  
Low Cost ◽  
Design Procedure ◽  
Field Performance ◽  
Shear Resistance ◽  
Asphalt Mixtures ◽  
Interactive Effects ◽  
Continuous Measure ◽  
Highly Sensitive ◽  
The Relationship

The development of a gyratory load-cell and plate assembly (GLPA) to measure the shear resistance of hot-mix asphalt mixtures is described. The GLPA is a simple tool that allows the measurement of the eccentricity of the resultant load applied by the gyratory compactor in real time during compaction. The GLPA is inserted on top of the mixture specimen in the compaction mold, requiring no changes in the compaction procedure. The results from the GLPA give a continuous measure of the resistance of asphalt mixtures to shearing under gyratory loading at a fixed angle. On the basis of a simplified analysis, it is hypothesized that the bulk shear resistance estimated from the GLPA is a good indicator of the compactibility of asphalt mixtures and their potential resistance to rutting under traffic. The shear resistance and volumetric characteristics of a number of trial mixtures fabricated in the laboratory were tested to show the utility of the GLPA. The results show that the shear resistance is highly sensitive to gradation, asphalt content, and temperature. They also indicate that there are interactive effects of these factors that are independent of the volumetric properties. Although the relationship between the results of the GLPA and the field performance of mixtures is yet to be determined, this device has the potential to be a low-cost and effective tool to complement the current volumetric mixture design procedure. It provides a tool to measure an important mechanical property that is a good indicator of bulk shear resistance of asphalt mixtures.

scholarly journals Shear Strength Characterization of Bauxite Deposits in Kuantan, East Coast Malaysia

2019 ◽  
Vol 8 (3S3) ◽  
pp. 404-407
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
East Coast ◽  
Field Performance ◽  
Friction Angle ◽  
Parent Rock ◽  
Index Tests ◽  
Strength Characterization ◽  
The Relationship

Engineering characterization which are useful for "temperate" zone soils usually fail to predict the field performance of bauxitic soils, because the index tests upon which the characterization are based are not always reproducible for bauxitic soils. Fifteen (15) bauxitic soil of undisturbed and disturbed samples from 3 distinct sites in Kuantan, all derived from basalt parent rock but representing various stages of weathering were subjected to engineering and mineralogic tests. Values for cohesion and friction angles are evaluated. Soils from Semambu has the highest moisture content of 33.27%, the cohesion value is however lower compared to Bukit Goh which has moisture content of 21.74%. Study are further done to discover the relationship with cohesion and friction angles. Thus, by measuring the cohesion and friction angle can evaluate the performance of bauxite shear strength.

Effect of Coarse Aggregate Morphology on the Resilient Modulus of Hot-Mix Asphalt

2005 ◽  
Vol 1929 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Tongyan Pan ◽  
Erol Tutumluer ◽  
Samuel H. Carpenter
Keyword(s):  
Surface Texture ◽  
Coarse Aggregate ◽  
Resilient Modulus ◽  
Asphalt Binder ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Maximum Aggregate Size ◽  
Asphalt Mixes ◽  
Aggregate Morphology ◽  
The Relationship

The resilient modulus measured in the indirect tensile mode according to ASTM D 4123 reflects effectively the elastic properties of asphalt mixtures under repeated load. The coarse aggregate morphology quantified by angularity and surface texture properties affects resilient modulus of asphalt mixes; however, the relationship is not yet well understood because of the lack of quantitative measurement of coarse aggregate morphology. This paper presents findings of a laboratory study aimed at investigating the effects of the material properties of the major component on the resilient modulus of asphalt mixes, with the coarse aggregate morphology considered as the principal factor. With modulus tests performed at a temperature of 25°C, using coarse aggregates with more irregular morphologies substantially improved the resilient modulus of asphalt mixtures. An imaging-based angularity index was found to be more closely related to the resilient modulus than an imaging-based surface texture index, as indicated by a higher value of the correlation coefficient. The stiffness of the asphalt binder also had a strong influence on modulus. When the resilient modulus data were grouped on the basis of binder stiffnesses, the agreement between the coarse aggregate morphology and the resilient modulus was significantly improved in each group. Although the changes in aggregate gradation did not significantly affect the relationship between the coarse aggregate morphology and the resilient modulus, decreasing the nominal maximum aggregate size from 19 mm to 9.5 mm indicated an increasing positive influence of aggregate morphology on the resilient modulus of asphalt mixes.

scholarly journals An Assessment of Storability of Norway Spruce Container Seedlings in Freezer Storage as Affected by Short-Day Treatment

Forests ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 692
Author(s):  
Johanna Riikonen ◽  
Jaana Luoranen
Keyword(s):  
Norway Spruce ◽  
Day Treatment ◽  
Field Performance ◽  
Matter Content ◽  
Dry Matter Content ◽  
Freezer Storage ◽  
Short Day ◽  
Chilling Hours ◽  
The Impact ◽  
The Relationship

Determination of safe times at which to transfer seedlings to freezer storage is problematic in forest tree nurseries. The present study aimed to determine the relationship between pre-storage frost hardiness (FH) of different plant parts, dry matter content (DMC), chilling hours (the sum of hours when temperature was between −5 °C and +5 °C), and post-storage vitality, and the impact of short-day (SD) treatment on these relationships. One and a half year old control seedlings and SD-treated seedlings of Norway spruce were transferred to freezer storage (−3 °C) on five occasions during autumn. On each occasion, the FH of buds, needles, stem, and roots, as well as DMC, were determined, and chilling hours were calculated. The vitality of the freezer-stored seedlings was determined through their root growth capacity in the subsequent spring, and through the field performance of the seedlings (shoot growth and seedling damage) at the end of the following two growing seasons. Seedlings were considered to be storable when the FH of the needles was at least −25 °C, and the FH of the roots was about −10 °C in both treatments. Early storage reduced the vitality of the seedlings. SD treatment did not advance the storability of the seedlings, although it alleviated some of the negative effects of early storage by improving the FH of needles and stem, but not that of the roots. The DMC value, indicating storability, was higher for SD-treated seedlings than for control seedlings. When data from five experiments conducted in Suonenjoki were combined, it was found that the relationship between accumulation of chilling hours and needle FH was dependent on nursery treatment and assessment year, which reduces the reliability of using chilling hours in predicting the storability of Norway spruce seedlings. The predicted climate change may complicate the fall acclimation of seedlings. New, user-friendly methods for determining storability of seedlings are urgently needed.

scholarly journals In-Field Performance of Biomass Balers

2020 ◽  
Vol 2 (4) ◽  
pp. 568-580
Author(s):  
Robert “Bobby” Grisso ◽  
Erin G. Webb ◽  
John S. Cundiff
Keyword(s):  
Field Data ◽  
Field Performance ◽  
Field Capacity ◽  
Maximum Throughput ◽  
Machine Performance ◽  
Time Motion ◽  
Management Concepts ◽  
Global Positioning ◽  
Motion Studies ◽  
The Relationship

Herbaceous biomass will contribute significantly to meeting renewable energy goals. Harvesting equipment for hay is generally suitable for mowing, raking, and baling grasses such as switchgrass; however, there is a need for field data to better understand machine performance in energy crops. The purpose of this study was to collect field data to estimate baler field capacity, throughput, and speed. Data gathered with a Differential Global Positioning System (DGPS) unit during baling provided time-motion studies of baler productivity. Six fields were used to compare field capacity, speed, and throughput results from four round balers and one large-square baler. The results show that in-field performance of round balers is significantly affected by yield, but that the relationship can be represented with machinery management concepts, knowledge of maximum throughput, and wrap-eject time. Baler performance will be overestimated if the yield, maximum throughput, and wrap-eject time are not correctly accounted for.

Study on Ice Breaking on Crumbed Rubber Asphalt Pavement Based on Self-Stress Method

2012 ◽  
Vol 256-259 ◽  
pp. 1807-1812 ◽  
Author(s):  
Qing Yi Xiao ◽  
Hong Jun Cui ◽  
Ning Li Li ◽  
Cai Li Zhang
Keyword(s):  
Elastic Modulus ◽  
Traffic Safety ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Highway Traffic ◽  
Friction Test ◽  
Rubber Content ◽  
Fem Method ◽  
The Relationship

Ice layer on pavement surface was a serious problem for highway traffic safety. Crumbed rubber asphalt mixture was an effective way to drive ice layer away from surface. Through wheel test asphalt mixture specimen with ice layer at negtive temperature, the paper studied ice breaking performance of asphalt mixtures containing different amount crumbed rubber. Pendulumlike friction test BPN after wheel test was taken as an performance index of crumber rubber asphalt breaking ice. Results shown that the quantity of crumbed rubber and the performance of ice breaking had good linear relationship and more rubber content had better slide resistance recover speed at same wheel arround number.Through numerial model of pavement covered ice based on FEM method, the paper had analyzed the relationship between elastic modulus of crumbed rubber pavement and ice stress-strain on pavement, and put forward the mechanism of ice breaking.

The Relationship between the Asphalt Indoor Aging Experiment and Actual Using Period

2013 ◽  
Vol 361-363 ◽  
pp. 1747-1750
Author(s):  
Zhong Gen Liu ◽  
Chun Yang Xia ◽  
Xiao Hong Liu
Keyword(s):  
Life Span ◽  
Reference Method ◽  
Test Results ◽  
Aging Properties ◽  
Asphalt Road ◽  
Actual Use ◽  
The Relationship ◽  
Test Result ◽  
Selection Of

This paper indoors for a sample of No90 asphalt has finished the asphalt aging, penetration, viscosity test at different temperature and time, comparing the indoor test results with the indexes of asphalt road actual use, the indoor test result and actual use aging relationship in all life-span service, to provide a reference method for the evaluation of asphalt anti-aging properties and selection of asphalt.

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