scholarly journals Assessing the moisture susceptibility of aggregates with Los Angeles abrasion test

2017 ◽  
Author(s):  
Adelia Dwidarma Nataadmadja ◽  
Oki Setyandito ◽  
Eduardi Prahara ◽  
Ida Riyanti
Keyword(s):  
Los Angeles ◽  
Moisture Susceptibility ◽  
Abrasion Test ◽  
Los Angeles Abrasion

scholarly journals Investigation on Comparison of Morphological Characteristics of Various Coarse Aggregates before and after Abrasion Test

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 492 ◽  
Author(s):  
Saisai Zhang ◽  
Jianzhong Pei ◽  
Rui Li ◽  
Yong Wen ◽  
Jiupeng Zhang
Keyword(s):  
Los Angeles ◽  
Surface Texture ◽  
High Performance ◽  
Morphological Characteristics ◽  
Repeated Loading ◽  
Abrasion Test ◽  
Coarse Aggregates ◽  
Los Angeles Abrasion ◽  
Before And After ◽  
Main Component

Under the repeated loading, the continuous impact and friction of tires on aggregates resulted in some changes in their morphology, which may cause rutting, decrease in skid resistance, and fatigue damage of the road. In order to explore specific changes in coarse aggregate morphology, the Los Angeles abrasion test was used to simulate the force exerted on coarse aggregates and the morphologies of different aggregates before and after abrasion were compared. Four types of coarse aggregates were selected and their mineral compositions were analyzed by X-Ray Diffraction (XRD). The morphological characteristics were measured using Aggregate Image Measurement System (AIMS-Ⅱ), including angularity, surface texture, sphericity and Flat and Elongation (F and E) ratio. Results showed that the angularity value for each type of aggregates significantly reduced after abrasion and the angularity reductions of various aggregates were consistent with the results of abrasion test, indicting the angularity reduction was the main component of abrasion loss. Whereas, there was no significant different between the surface texture of coarse aggregates before and after abrasion. For shape properties, both sphericity and F and E ratio results showed that aggregates with excessively high F and E ratio were easy to break, which might cause rutting and were harmful to pavement. Therefore, for pavements with high performance requirement, coarse aggregates with large angularity and low abrasion value should be preferred, whereas the quantity of particles with excessively high F and E ratio should be controlled.

scholarly journals A Laboratory Investigation into the Effects of Coarse Aggregate Angularity on Performance of WMA

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Jie Ji ◽  
Peng Zhai ◽  
Wenhua Zheng ◽  
Zhi Suo ◽  
Ying Xu
Keyword(s):  
Los Angeles ◽  
Coarse Aggregate ◽  
Asphalt Binder ◽  
Design Procedure ◽  
Thermal Cracking ◽  
Moisture Susceptibility ◽  
Los Angeles Abrasion ◽  
Modified Asphalt Binder ◽  
Air Void ◽  
Sharp Corners

This study evaluated the effects of coarse aggregate angularity (CAA) on the performances of warm mix asphalt (WMA) because previous studies have predominantly focused on the effects of CAA on the hot mix asphalt (HMA) performances. Five different CAAs were fabricated using Los Angeles abrasion test, and the digital image processing method was used to identify the CAA. Five mixes with different combinations of CAA and Sasobit-modified asphalt binder were prepared according to the Marshall mix design procedure. The performances such as the resistance to rutting and thermal cracking, moisture susceptibility, and volumetric characteristics of WMA were evaluated. The test results indicated that the CAA value was linearly declined with the abrasive wearing passes increased. Higher CAA value improved the potential to resistance to rutting of WMA but was not suitable to enhance the resistance to thermal cracking of WMA due to sharp corners that caused higher stress concentration. In addition, WMA was more prone to develop numerous macrocracking, which resulted in lower moisture susceptibility due to higher CAA value inducing higher air void, VMA, and VCA of WMA.

An approach to the abrasion testing of individual pieces of construction materials

1998 ◽  
Vol 13 (1) ◽  
pp. 193-196
Author(s):  
M. A. Eden
Keyword(s):  
Los Angeles ◽  
Abrasion Resistance ◽  
Construction Materials ◽  
Test Method ◽  
Test Material ◽  
Comparative Approach ◽  
Abrasion Test ◽  
Test Pieces ◽  
Los Angeles Abrasion ◽  
Abrasion Testing

AbstractThis paper briefly introduces the basis of abrasion testing and suggests a rapid and simple test that allows the abrasion resistance of specific materials to be evaluated. Small, individual pieces of rock, mortar, or concrete can be tested and the method has been used to evaluate the potential for surface abrasion of concrete surfaces. Many of the commonly used test methods for measuring abrasion resistance of construction materials are aggregate tests such as the QMW mill abrasion test and the ASTM Los Angeles abrasion test which measure the combined resistance of a material to impact and abrasion. Other tests such as the aggregate abrasion and polished stone value tests require a smaller numberof resin mounted aggregate pieces to be studied. The ASTM surface abrasion test for concrete uses physically large flat test pieces. Like the ASTM test, the test method described in this paper measures only the abrasion resistance. However, it provides a means of comparing the abrasion resistance of small pieces of construction material and introduces quartz as a reference material.The test uses a mixture of oil and carborundum as a grinding medium with 10 mm square test pieces held by a standard load against a rotating steel lapping wheel in a rotating jig. The results are expressed as a ratio of the abrasion rate of the test material to that of quartz tested in the same way. This comparative approach enables the test to be carried out using equipment of various designs.

Utilization of Gneiss in Asphalt Concrete Mixtures

2009 ◽  
Vol 620-622 ◽  
pp. 1-4 ◽  
Author(s):  
Shao Peng Wu ◽  
De Ming Hu ◽  
Ling Pang ◽  
Hong Wang
Keyword(s):  
Los Angeles ◽  
Physical Properties ◽  
Hydrated Lime ◽  
Fine Aggregate ◽  
Moisture Susceptibility ◽  
Los Angeles Abrasion ◽  
Concrete Mixtures ◽  
Low Temperature Cracking ◽  
Flakiness Index ◽  
Marshall Stability

Construction of the pavement has consumed a huge amount of high grade aggregates, such as basalt, limestone etc. In some region, these aggregates are very scarce and have to be produced and transported from far aggregate quarries which would cause the waste of energy and resources as well as the increase of cost. Large quantities of gneiss exist in China, the use of gneiss as aggregates might help meet the highway constructing demands and save. In this paper, the feasibility is analyzed with respect to different aspects. Physical properties of gneiss aggregate were evaluated using Los Angeles abrasion, specific gravity and flakiness index. Mixture properties were characterized in terms of Marshall stability, moisture susceptibility, soak wheel track and low temperature cracking resistance property. Experiment results indicate that the physical properties of gneiss aggregates can satisfy the related specifications and these gneiss materials as aggregates can be used in asphalt pavement. Results also show that the optimal gradation component of the mixture consists of the gneiss as coarse aggregate and the limestone as fine aggregate. The use of hydrated lime can improve the moisture susceptibility of the mixtures containing gneiss aggregates.

Characterizing Ballast Degradation through Los Angeles Abrasion Test and Image Analysis

2014 ◽  
Vol 2448 (1) ◽  
pp. 142-151 ◽  
Author(s):  
Yu Qian ◽  
Huseyin Boler ◽  
Maziar Moaveni ◽  
Erol Tutumluer ◽  
Youssef M. A. Hashash ◽  
...  
Keyword(s):  
Image Analysis ◽  
Los Angeles ◽  
Abrasion Test ◽  
Los Angeles Abrasion
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