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.

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.

Aggregate Polishing Resistance Pre-Evaluation

1996 ◽  
Vol 1530 (1) ◽  
pp. 103-110
Author(s):  
L. K. Crouch ◽  
Greg Shirley ◽  
Gary Head ◽  
William A. Goodwin
Keyword(s):  
Los Angeles ◽  
Coefficient Of Variation ◽  
Frictional Resistance ◽  
Test Method ◽  
Engineering Properties ◽  
Los Angeles Abrasion ◽  
Maximum Coefficient ◽  
Resistance Performance ◽  
Single Size ◽  
Repeatability Test

Current methods of pre-evaluation of aggregates for bituminous surface courses such as the British Pendulum and British Polishing Wheel and chemical or mineralogical methods are only able to identify clearly aggregates with a high probability of performing well. There is little agreement among researchers as to what engineering properties will provide adequate frictional resistance at various average daily traffic (ADT) levels. The lack of agreement has led to conservative polish-resistance specifications and subsequently higher pavement costs. The Tennessee Textural Retention Method (TTRM) uses single size aggregate (6.35 to 9.52 mm), the Los Angeles Abrasion device, and a modified version of the AASHTO TP 33 device to evaluate particle shape and texture throughout simulated aging. In this evaluation, using 25 Tennessee aggregates, the TTRM was used to characterize aggregate polish-resistance performance at various ADT levels by comparing the results obtained on other aggregates with the results from field proven performers. The TTRM ranked all Tennessee proven performing siliceous limestones and gravels in the appropriate ADT category for which they are currently approved. In addition, new promising aggregate sources were revealed. The test method had a coefficient of variation for aggregate ratings of less than 3 percent for a nine-sample repeatability test. In addition, the maximum coefficient of variation of voids tests at any given aging revolution for an individual aggregate never exceeded 2 percent. The method may be helpful in pairing aggregate polish-resistance performance with pavement need based on ADT.

scholarly journals Easy Way To Determine The Feasibility Of Coarse Aggregate On All Pavement Layers Using The Los Angeles Tatonas TA-700 Machine

UKaRsT ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 296
Author(s):  
Mahardi Kamalika Khusna Ali ◽  
Agata Iwan Candra ◽  
Elsa Rizqi Purwanti ◽  
Rikha Wirda Izzati ◽  
Kavindo Yugiswara Hutama ◽  
...  
Keyword(s):  
Los Angeles ◽  
Coarse Aggregate ◽  
Resistance Index ◽  
Poor Quality ◽  
Abrasion Test ◽  
Road Pavement ◽  
Average Wear ◽  
Low Wear ◽  
Pavement Layers ◽  
Abrasion Testing

The use of coarse aggregate with poor quality can cause bumpy roads, cracked roads, potholes, and others. Coarse aggregate wear is an indicator of the aggregate resistance index against friction with other objects. Any aggregate to be used in a pavement mix must meet the wear requirements. Low wear causes the aggregate to be easily crushed when exposed to friction and has an impact on a low level of stability. The purpose of this research is to determine the feasibility of coarse aggregate in Kedak Village, Kediri. One of the feasibility of coarse aggregate is reviewed based on wear with abrasion testing. This research was conducted by using an abrasion test using the Los Angeles TA-700 machine and SNI 2417:2008 as a reference. The specimens were taken at random and met the criteria for passing the number 3/4 sieve and stuck on the 2500 gram sieve number 1/2 and the aggregate that passed the 1/2 sieve was stuck on the 3/8 sieve as much as 2500 grams. The results obtained stated that the average wear of the abrasion test was 26.6%. Based on these results, the aggregate can be said to be feasible because it does not exceed 40% in accordance with the provisions of the 2018 Binamarga General Specifications. So that coarse aggregate from Kedak Village, Kediri can be used for all mixtures of road pavement layers.

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