Image Analysis Evaluation of Aggregates for Asphalt Concrete Mixtures

1998 ◽  
Vol 1615 (1) ◽  
pp. 65-71 ◽  
Author(s):  
Chun-Yi Kuo ◽  
Reed B. Freeman
Keyword(s):  
Image Analysis ◽  
Asphalt Concrete ◽  
Morphological Characteristics ◽  
Engineering Properties ◽  
Natural Sand ◽  
Coarse Aggregates ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Pavement Engineering ◽  
Recent Developments

The performance of asphalt concrete mixtures is influenced by the properties of the included aggregates, such as grading, shape (angularity and elongation), and texture (roughness). Complete and accurate quantification of aggregate properties is essential for understanding their influence on asphalt concrete and for selecting aggregates to produce high-quality paving mixtures. Recent developments in the use of digital image analysis techniques for quantifying aggregate morphological characteristics in asphalt concrete are summarized. Image morphological characteristics were used to quantify flatness and elongation of coarse aggregates, to estimate the proportion of natural sand in fine aggregates, and to correlate aggregate characteristics with engineering properties of asphalt concrete mixtures. Image analysis of sections also revealed information about the grading, shape, and orientation of coarse aggregates in a mixture. An overview is presented of the broad range of useful pavement engineering applications of this relatively new approach for evaluating aggregate characteristics.

scholarly journals Special Issue: Recent Advances and Future Trends in Pavement Engineering

2020 ◽  
Vol 5 (4) ◽  
pp. 34
Author(s):  
Patricia Kara De Maeijer
Keyword(s):  
Fiber Optics ◽  
Asphalt Concrete ◽  
Future Trends ◽  
Special Issue ◽  
Destructive Testing ◽  
Recycled Asphalt ◽  
Recent Advances ◽  
Pavement Monitoring ◽  
Pavement Engineering ◽  
Recent Developments

This Special Issue “Recent Advances and Future Trends in Pavement Engineering” has been proposed and organized to present recent developments in the field of innovative pavement materials and engineering. For this reason, the articles and state-of-the-art reviews highlighted in this editorial relate to different aspects of pavement engineering, from recycled asphalt pavements to alkali-activated materials, from hot mix asphalt concrete to porous asphalt concrete, from interface bonding to modal analysis, from destructive testing to non-destructive pavement monitoring by using fiber optics sensors.

The Influence of Coconut Shell as Coarse Aggregates in Asphalt Mixture

2016 ◽  
Vol 700 ◽  
pp. 227-237 ◽  
Author(s):  
Siti Nur Amiera Jeffry ◽  
Ramadhansyah Putra Jaya ◽  
Norhafizah Manap ◽  
Nurfatin Aqeela Miron ◽  
Norhidayah Abdul Hassan
Keyword(s):  
Tensile Strength ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Indirect Tensile Strength ◽  
Coconut Shell ◽  
Engineering Properties ◽  
Modified Bitumen ◽  
Coarse Aggregates ◽  
Indirect Tensile

Significant quantities of coconut shell (CS), a by-product of agriculture, can be used as an artificial source of coarse aggregates. In this study, four CSs were used as coarse aggregates replacement in asphalt concrete with 0%, 10%, 20%, 30%, and 40% weight volumes. The particle sizes of the CSs used as main coarse aggregates range from 5 mm to 20 mm. The Marshall Stability test shows that the optimum bitumen content for asphalt mixtures is 5.1%. The engineering properties investigated include the volumetric, dynamic creep, indirect tensile strength, and resilient modulus. Test results show that stability decreases with increasing CS content because of high water absorption. Considering that CSs absorb bitumen, a further detailed investigation is needed to assess the performance of modified bitumen on mixture. Furthermore, the use of CSs as coarse aggregates in asphalt concrete help increase the resilient modulus, stiffness, and indirect tensile strength up to 30%. Generally, a 10% replacement of coarse aggregates with CSs is the optimal limit.

Seashells and Oyster Shells: Biobased Fine Aggregates in Concrete Mixtures

2022 ◽  
Author(s):  
Giuliana Scuderi
Keyword(s):  
Compressive Strength ◽  
Relevant Literature ◽  
Primary Component ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Air Content ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Alternative Materials ◽  
Mixing Water

The construction industry is the largest global consumer of materials, among which sand plays a fundamental role; now the second most used natural resource behind water, sand is the primary component in concrete. However, natural sand production is a slow process and sand is now consumed at a faster pace than it’s replenished. One way to reduce consumption of sand is to use alternative materials in the concrete industry. This paper reports the exploratory study on the suitability of aquaculture byproducts as fine aggregates in concrete mixtures. Seashell grit, seashell flour and oyster flour were used as sand replacements in concrete mixtures (10%, 30% and 50% substitution rates). All the mixtures were characterized in fresh and hardened states (workability, air content, compressive strength and water absorption). Based on compressive strength, measured at 7 and 28 days, seashell grit provided the most promising results: the compressive strength was found to be larger than for conventional concrete. Moreover, the compressive strength of the cubes was larger, when larger percentages of seashell grit were used, with the highest value obtained for 50% substitution. However, for oyster flour and seashell flour, only 10% sand substitution provided results comparable with the control mixture. For the three aggregates, workability of concrete decreases with fineness modulus decrease. For mixtures in which shell and oyster flour were used with 30% and 50% substitution percentages, it was necessary to increase the quantity of mixing water to allow a minimal workability. In conclusion, considering the promising results of the seashell grit, it is suggested to study further the characteristic of the material, also considering its environmental and physical properties, including acoustic and thermal performances. Higher substitution percentages should also be investigated. This research adds to the relevant literature in matter of biobased concrete, aiming at finding new biobased sustainable alternatives in the concrete industry.

Effect of Stone Ash Mixture and Coconut Fiber on Concreate Compressive Strenght

2020 ◽  
Vol 6 (4) ◽  
pp. 462-471
Keyword(s):  
Compressive Strength ◽  
Laboratory Tests ◽  
Concrete Compressive Strength ◽  
Coconut Fiber ◽  
Normal Concrete ◽  
Strength Concrete ◽  
Coarse Aggregates ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Coconut Fibers

Abstract: The composition of the concrete mixture determines the compressive strength. Concrete mixtures generally consist of cement, water, coarse aggregates, fine aggregates, and concrete drugs. In this study, it will be tried to mix stone ash and coconut fibers. The purpose of this study is to find out the concrete compressive strength with add stone ash and coconut fibers to normal concrete. Data was collected through laboratory tests by carrying out an additional mixture of stone ash and coconut fibers. There were six types of specimens produced which were measured for 7, 14, 21, and 28 days. Variation of specimens 1) normal concrete, 2) normal concrete + stone ash, 3) normal concrete + coconut fiber (1.5%), 4) normal concrete + stone ash and coconut fiber (1.5%), 5) normal concrete + stone ash and 1% coconut fiber, 6) normal concrete + 1% coconut fiber. From the results of testing the concrete compressive strength was obtained 455 kg/cm2 for the age of concrete for 28 days with a mixture of normal concrete + stone ash.

scholarly journals Laboratory Investigation of Fatigue Characteristics of Asphalt Mixtures with Steel Slag Aggregates

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Hassan Ziari ◽  
Shams Nowbakht ◽  
Sajad Rezaei ◽  
Arash Mahboob
Keyword(s):  
Fatigue Life ◽  
Resilient Modulus ◽  
Steel Slag ◽  
Engineering Properties ◽  
Fine Aggregate ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Indirect Tensile ◽  
Fatigue Characteristics ◽  
Marshall Stability

There are many steel-manufacturing factories in Iran. All of their byproducts, steel slag, are dumped randomly in open areas, causing many environmentally hazardous problems. This research is intended to study the effectiveness of using steel slag aggregate (SSA) in improving the engineering properties, especially fatigue life of Asphalt Concrete (AC) produced with steel slag. The research started by evaluating the physical properties of the steel slag aggregate. Then the 13 types of mixes which contain steel slag in portion of fine aggregates or in portion of coarse aggregates or in all portions of aggregates were tested. The effectiveness of the SSA was judged by the improvement in Marshall stability, indirect tensile strength, resilient modulus, and fatigue life of the AC samples. It was found that replacing the 50% of the limestone coarse or fine aggregate by SSA improved the mechanical properties of the AC mixes.

MARSHALL TEST CHARACTERISTICS OF ASPHALT CONCRETE MIXTURE WITH SCRAPPED TIRE RUBBER AS A FINE AGGREGATE

2017 ◽  
Vol 79 (2) ◽  
Author(s):  
Gito Sugiyanto
Keyword(s):  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Tire Rubber ◽  
Test Characteristics ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Marshall Test ◽  
Asphalt Content

Highways are important transportation infrastructures that influence economy, culture, and security. Most of the highways in Indonesia are flexible pavement that use asphalt as a binder. The use of scrapped tire rubber as a partial replacement of fine aggregates is based on the limited available natural aggregate in nature. Utilization of scrapped tire rubber as a fine aggregate is one of the alternatives for reducing environmental pollution and supporting Clean Development Mechanism program. The aim of this study is to analyze the Marshall test characteristics of asphalt concrete (AC) mixture that use scrapped tire rubber as a partial substitute of fine aggregate and comparing with a standard mixture. Laboratory tests are performed on three different types of mixtures as follows the mix without scrapped tire rubber, mix containing 50%, and 100% substitution of aggregate at fraction of No.50 with scrapped tire rubber. The test, it show that optimum asphalt content for ACStandard mixture is 6.76%, while ACScrapped-tire 50% mixture is 7.04% and ACScrapped-tire 100% mixture is 6.25%. The use of scrapped tire rubber in asphalt concrete mixtures can improve the resistance to permanent deformation and resistance to water. The use of scrapped tire rubber is acceptable as a partial replacement of aggregate in asphalt concrete mixtures.  

scholarly journals Optimum Percentage of Sawdust and Brick Ballast in Light Weight Concrete

2017 ◽  
Vol 5 (2) ◽  
pp. 112-122
Author(s):  
Neeru Singla ◽  
Mandeep Kumar
Keyword(s):  
Compressive Strength ◽  
Low Cost ◽  
Light Weight ◽  
River Sand ◽  
Natural Sand ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Conventional Material ◽  
Sand And Gravel ◽  
Made In

Construction industry relies heavily on conventional material such as cement, sand and gravel for the production of concrete The river sand and gravels which are most commonly used as fine aggregates and coarse aggregates respectively in the production of concrete, poses the problem of acute shortage in many areas, whose continued use has started posing serious problem with respect to its availability, cost and environmental impact. Attempt is being made in this project to use the locally available waste materials to replace the river sand and gravels to produce light weight and low cost concrete. Sawdust and Brick ballast are easily affordable at low costs, which are partially replaces with river sand and gravels respectively for making concrete. Natural sand and Gravels have been partially replaced (4% SD 8% BB, 4% SD 16% BB, 4% SD 24% BB, 8% SD 8% BB, 8% SD 16% BB, 8% SD 24% BB, 12% SD 8% BB, 12% SD 16% BB and 12% SD 24% BB. by using M30 grade of concrete) with sawdust and broken brick ballast respectively. For this, thirty concrete cubes of size 150mm X 150mm X 150mm have been casted and water cement ratio of 0.42 has been used. Water reducing admixture is used to increase the workability. Slump test, Compacting factor test and compressive strength at (28 days) of specimens having above combinations have been compared with control specimens. The workability and compressive strength gradually decreases for the increasing the replacement percentages. The optimum mix found to produce M30 grade of concrete is 8% of sawdust and 16% of Brick ballast.

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