Test Methods for Uncompacted Void Content of Fine Aggregate (as Influenced by Particle Shape, Surface Texture, and Grading)

2017 ◽  
Author(s):  
Keyword(s):  
Surface Texture ◽  
Particle Shape ◽  
Test Methods ◽  
Void Content ◽  
Fine Aggregate

Uncompacted Void Content of Fine Aggregate as Quality Indicator of Materials Used in Superpave Mixtures

2000 ◽  
Vol 1723 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Jose Leomar Fernandes ◽  
Reynaldo Roque ◽  
Mang Tia ◽  
Lorenzo Casanova
Keyword(s):  
Shear Strength ◽  
Microscopic Analysis ◽  
Test Methods ◽  
Standard Test ◽  
Design System ◽  
Void Content ◽  
Fine Aggregate ◽  
Direct Shear ◽  
Lower Shear ◽  
Fine Aggregates

The uncompacted void content of fine aggregate, or fine aggregate angularity (FAA), was introduced in the Superpave mixture design system to screen smooth or rounded fine aggregates that may result in mixtures with low rutting resistance. The assumption is that fine aggregates with lower FAA values have lower shear strength (internal friction) and lower resistance to rutting. Continued implementation and evaluation of the Superpave system has led to numerous questions regarding the validity of this assumption and of the use of the FAA test in general. Nine fine aggregates were used to evaluate the FAA test and to determine whether it was a reliable indicator of fine aggregate shear strength. FAA tests were performed using three gradations and the three standard test methods (A, B, and C). Microscopic analysis was conducted to obtain independent visual measures of angularity and texture. Direct shear tests were performed at four confining stresses to determine shear strength parameters. Results indicated that FAA values were related to visual measures of texture and angularity. However, although FAA value contributed to shear strength, it appeared that other factors such as toughness, gradation, and packing characteristics of the fine aggregate overshadow its effect. For the fine aggregates tested, the FAA test rejected aggregates with high shear strength and accepted aggregates with low shear strength. It was concluded that FAA values alone may not be adequate to assess shear resistance of fine aggregate. Direct shear strength may be a better parameter, but additional work is required to evaluate its validity and feasibility.

Relationship Between Particle Shape and Void Content of Fine Aggregate

2004 ◽  
Vol 26 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Ufuk Dilek ◽  
MichaelL. Leming
Keyword(s):  
Particle Shape ◽  
Void Content ◽  
Fine Aggregate

Influence of Aggregate Properties on Performance of Heavy-Duty Hot-Mix Asphalt Pavements

1996 ◽  
Vol 1547 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Randy C. Ahlrich
Keyword(s):  
Creep Test ◽  
Hot Mix Asphalt ◽  
Test Methods ◽  
Unit Weight ◽  
Void Content ◽  
Fine Aggregate ◽  
Heavy Duty ◽  
Coarse Aggregates ◽  
Aggregate Properties ◽  
Aggregate Particles

Because approximately 85 percent of the total volume of hot-mix asphalt (HMA) mixtures consists of aggregates, the performance of HMA mixtures is greatly affected and influenced by properties of the aggregate blend. The angularity, shape, and texture of the aggregate particles have a significant effect on the performance of HMA mixtures by controlling the mixture's strength and rutting resistance. Rough, angular aggregates have been proved to produce higher-quality HMA pavements than smooth, round aggregates. Current aggregate tests are primarily based on experience and empirical characterization tests. A study was conducted to evaluate test methods that could be used to characterize aggregate properties that are related to HMA rutting potential of heavy-duty pavements. Specifically, FAA aggregate properties and aircraft loading conditions were addressed. The aggregate particles were characterized with the particle index (ASTM D3398), uncompacted void content for fine aggregate (ASTM C1252), modified ASTM C1252 for coarse aggregate, and unit weight and voids in aggregate (ASTM C29). The HMA mixtures were evaluated for rutting potential using the confined repeated load deformation (dynamic creep) test. The laboratory investigation indicated that the tests for particle index, uncom-pacted void content for fine and coarse aggregates, and unit weight and voids in aggregate could be used to characterize the shape and texture of aggregate particles. The study also indicated that the confined creep test could differentiate between HMA mixtures with different aggregate properties in terms of their rutting potential.

scholarly journals Experimental Study on Strength of Pervious Concrete by Using Fine Aggregate

2021 ◽  
Vol 9 (12) ◽  
pp. 895-897
Author(s):  
Atif Jawed
Keyword(s):  
Compressive Strength ◽  
Void Ratio ◽  
Rice Husk Ash ◽  
Pervious Concrete ◽  
Void Content ◽  
Fine Aggregate ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Flow Through ◽  
Concrete Matrix

Abstract: Pervious concrete is a special type of concrete, which consists of cement, coarse aggregates, water and if required and other cementations materials. As there are no fine aggregates used in the concrete matrix, the void content is more which allows the water to flow through its bodyThe main aim of this project was to improve the compressive strength characteristics of pervious concrete. But it can be noted that with increase in compressive strength the void ratio decreases. Hence, the improvement of strength should not affect the porosity property because it is the property which serves its purpose. In this investigation work the compressive strength of pervious concrete is increased by a maximum of 18.26% for 28 days when 8% fine aggregates were added to standard pervious concrete Keywords: W/C ratio, pervious Concrete, sugarcane bagasse’s ash, rice husk ash compressive strength, fine aggregates

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