Determination of fine aggregate angularity in relation with the resistance to rutting of hot-mix asphalt

2005 ◽  
Vol 19 (2) ◽  
pp. 155-163 ◽  
Author(s):  
Ali Topal ◽  
Burak Sengoz
Keyword(s):  
Hot Mix Asphalt ◽  
Fine Aggregate

Determination of Polymer Type and Content in Concrete Materials by FTIR and TGA

2015 ◽  
Vol 1129 ◽  
pp. 151-158
Author(s):  
Takako Tokura ◽  
Joyce Lim ◽  
Ai Ming Chua ◽  
Wey Liang Lee ◽  
James Wong
Keyword(s):  
Construction Materials ◽  
Attenuated Total Reflection ◽  
Polymer Materials ◽  
Accurate Information ◽  
Fine Aggregate ◽  
Group Information ◽  
Concrete Materials ◽  
Spectrum Matching ◽  
Polymer Type

Polymers are commonly used in concrete materials. The type and concentration of polymer are important information for stakeholders, because they have a critical impact on the properties of concrete materials. Therefore, reliable and accurate information is highly desirable. To this end, Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) are used to analyze polymer contents in construction materials.FTIR spectroscopy is a suitable technique to identify the polymer type using IR spectrum matching. Additionally, functional group information can be easily obtained from each peak. Attenuated Total Reflection (ATR) method can be used to measure extracted polymers from construction materials to obtain IR spectra, and match against the library database to identify the polymer materials. TGA is one of the common thermal analysis methods. It measures the weight loss or gain of sample due to chemical reactions such as vaporization, decomposition and oxidation as a function of temperature. In this paper, we will discuss development of reliable analytical methods with which mixtures of polymer, fine aggregate and cement with different percentages of polymer content were prepared and evaluated.

Durability and Mechanical Properties of Self-Compacting Concrete Incorporating Recovered Filler from Hot Mix Asphalt Plants and Recycled Fine Aggregate

2021 ◽  
Vol 894 ◽  
pp. 95-101
Author(s):  
Sepehr Ghafari ◽  
Fereidoon Moghadas Nejad ◽  
Ofelia Corbu
Keyword(s):  
Compressive Strength ◽  
Hot Mix Asphalt ◽  
Mechanical Performance ◽  
Fine Fraction ◽  
Production Plant ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Limestone Filler ◽  
Recycled Fine Aggregate ◽  
Maximum Particle

In this research, a sustainable approach is followed to develop efficient mixtures incorporating recycled fine aggregate (RFA) remained from structure demolition as well as limestone filler (LF) from production of hot mix asphalt (HMA). The LF is a byproduct of the drying process in HMA production plant which is not entirely consumed in the production of the HMA and must be hauled and disposed in landfills. The maximum particle size of the LF is approximately 40 µm. Self-Compacting Concrete (SCC) mixtures were designed replacing 5% and 10% of the cement with LF. Incorporation of 50%, and 100% RFA with the fines in the mixtures were considered with and without addition of the LF. Due to the formwork and prefabrication restrictions, the paste volume and the high range water reducer content were tuned in such a way that the slump flow of the mixtures remained between 660 mm to 700 mm without segregation. Durability and mechanical performance of the mixtures were evaluated by resistance against freeze-thaw scaling exposed to deicing agents and compressive strength. It was observed that the SCC mixtures containing 10% LF outperformed those without the use of LF while 5% SCC mixtures did not exhibit tangible superiority. Incorporation of RFA as the fine fraction degraded the durability of all the mixtures. While replacing all the fine fraction with RFA significantly impaired durability and compressive strength, 50% RF mixtures could be designed containing 10% LF that remained in the allowable limits.

Determination of the Binder Content of Fine Aggregate Matrices Prepared with Modified Binders

2018 ◽  
Vol 30 (4) ◽  
pp. 04018045 ◽  
Author(s):  
A. Ka Yan Ng ◽  
A. C. do Vale ◽  
A. C. Gigante ◽  
A. L. Faxina
Keyword(s):  
Binder Content ◽  
Fine Aggregate ◽  
Modified Binders

Analysis of the Effect of Adding Sandy Clay into Cement Mortar on the Bending Strength of Built-Up Masonry Prisms

2019 ◽  
Vol 31 ◽  
pp. 26-37
Author(s):  
Hassan M. Hassan Ali ◽  
Koh Heng Boon ◽  
Rasheed Altouhami ◽  
Ng Wei Shen ◽  
Ashraf Radwan ◽  
...  
Keyword(s):  
Bending Strength ◽  
Fine Sand ◽  
Fine Aggregate ◽  
Clay Brick ◽  
Masonry Unit ◽  
Natural Sand ◽  
Sandy Clay ◽  
Masonry Prism ◽  
Masonry Units

Mortar is a workable paste essential in civil and building construction. Mortar works as binding material extensively use for masonry unit in construction. The global consumption of natural sand is very high, due to the extensive use of concrete or mortar. Natural sand deposits are being depleted and causing a serious threat to the environment as well as the society. Sandy clay has been widely use in preparing the mortar for masonry work. The aim of this research was to study the bending strength of built-up masonry prism using sandy clay mortar. There were two series of mortar containing 0% and 100% of sandy clay had been prepared. The sandy clay was used to replace natural fine aggregate. Mortar with 0% sandy clay was the control mix containing 100% natural fine aggregate. Three types of masonry unit consist of clay brick, cement brick and lightweight brick were used in this study. The masonry units were combined together using the mortar joints to form the masonry prisms. 100% natural fine sand and 100% sandy clay mortar were prepared and used for the joints. Built-up masonry prisms with single and double joints of mortar. Also, the masonry prisms contained from a length ranging from 390 mm to 610 mm were prepared using the mortar joints. The thickness of the mortar joint which was used in this study was 10 mm, 20 mm and 30 mm. the prisms had been tested for the determination of bending strength at 28 days. The experimental results were analyzed to investigate the effect of sandy clay and thickness of mortar on the bending strength of built-up masonry prism. Results had shown that masonry prism built with sandy clay mortar has higher bending strength compare to the fine sand mortar. Clay brick exhibited highest bending strength with sandy clay mortar which was 38.28 N/mm2and cement brick had the lowest bending strength which was 18.8 N/mm2, while cement brick achieved optimum bending strength. In addition, the highest collapse and deflection achieved by clay brick and cement brick whereas the lowest value of collapse and deflection was by lightweight brick. The highest percentage of increment in terms of collapse load was determined to be 13.73% for sandy clay mortar prism. Hence, 100% sandy clay mortar is suitable to be used in masonry works.

Modified Ignition Oven Test Procedure for Determination of Binder Content in Hot Mix Asphalt Containing Dolomite Aggregate

2011 ◽  
Vol 39 (6) ◽  
pp. 103312 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Karol J. Kowalski ◽  
Rebecca S. McDaniel ◽  
Jan Olek ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Test Procedure ◽  
Binder Content ◽  
Oven Test

Use of Screenings to Produce Hot-Mix Asphalt Mixtures

2003 ◽  
Vol 1832 (1) ◽  
pp. 59-66 ◽  
Author(s):  
L. Allen Cooley ◽  
Jingna Zhang ◽  
Michael H. Huner ◽  
E. Ray Brown
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Binder ◽  
Cellulose Fiber ◽  
Fine Aggregate ◽  
Structural Improvement ◽  
Maintenance And Rehabilitation ◽  
Modified Asphalt Binder ◽  
Maximum Particle ◽  
Air Void ◽  
Different Sources

Thin-lift hot-mix asphalt (HMA) layers are utilized in almost every maintenance and rehabilitation application. These mix types require smaller maximum particle sizes than do most conventional HMA surface layers. Although the primary functions of thin-lift HMA are to level the pavement surface, smooth the surface, or slow the deterioration of the existing pavement, or all three, these mixes may also provide some structural improvement, depending on the layer thickness placed. The use of manufactured aggregate screenings (fine aggregate stockpiles) as the sole aggregate portion of an HMA mixture was evaluated in this study. Mixes of this nature have the potential for use as thin-lift HMA layers. Two different sources of aggregate screenings, granite and limestone, were utilized to design mixtures at varying design air void contents and then tested for rut susceptibility. The use of a neat versus a modified asphalt binder was also evaluated, as well as the potential advantages of cellulose fiber additives. These mixtures using 100% manufactured screenings proved to be acceptable with regard to rutting resistance. No work was performed in this study to examine thermal cracking or durability.

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