Volumetric Properties of Stone Mastic Asphalt Mixtures Containing Tear Off Shingles

10.32920/ryerson.14653215 ◽

2021 ◽

Author(s):

M. Nawaz Panhwer

Keyword(s):

Void Ratio ◽

Binder Content ◽

Asphalt Mixtures ◽

Mix Design ◽

Volumetric Properties ◽

Strength Ratio ◽

Mastic Asphalt ◽

Bitumen Content ◽

Stone Mastic Asphalt ◽

Air Void

Stone Mastic Asphalt (SMA) is a tough, stable, rut-resistant mixture that relies on stone-to-stone contact to provide strength and a rich mortar binder to provide durability. The design of an SMA is critical in providing an aggregate grading that will be compatible with the high bitumen content that provides durability without binder drainage. This project investigates the use of tear-off shingles in SMA to produce economic mixtures. The mixture containing shingles were compared to control mixes (without shingles), but with fibers at the same level as those mixtures containing shingles. As per Superpave method of mix design all mixes met the air void ratio at N (design) and N (max). SMA mixtures were tested using Marshall Method for stability and flow. Mix design results showed that all required volumetric properties can be achieved with lower binder content if shingles can be added to SMA mixes. The critical property in SMA (the draindown) was controlled and the tensile strength ratio was improved by using tear-off shingles.

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Effect of Palm Oil Clinker (POC) Aggregate on the Mechanical Properties of Stone Mastic Asphalt (SMA) Mixtures

Sustainability ◽

10.3390/su12072716 ◽

2020 ◽

Vol 12 (7) ◽

pp. 2716

Author(s):

Ali Babalghaith ◽

Suhana Koting ◽

Nor Sulong ◽

Mohamed Karim ◽

Syakirah Mohammed ◽

...

Keyword(s):

Palm Oil ◽

Asphalt Binder ◽

Asphalt Mixture ◽

Binder Content ◽

Mix Design ◽

Fine Aggregate ◽

Mastic Asphalt ◽

Fine Aggregates ◽

Stone Mastic Asphalt ◽

Aggregate Composition

Aggregate composition has a pivotal role in ensuring the quality of pavement materials. The use of waste materials to replace the aggregate composition of asphalt pavement leads to green, sustainable, and environmentally friendly construction, which ultimately preserves nature by reducing the need to harvest materials from natural sources. Using the Marshall mix design, the main objective of this paper is to investigate the effects of waste palm oil clinker (POC) as fine aggregates replacement on the properties of stone mastic asphalt (SMA) mixture. Six groups of asphalt mixtures were prepared using different percentages of palm oil clinker content (0%, 20%, 40%, 60%, 80%, and 100%). To determine the Marshall properties and select the optimum binder content, asphalt mixture samples with different percentages of asphalt binder content (5.0%, 5.5%, 6.0%, 6.5%, and 7.0%) were prepared for each group. The results showed that the palm oil clinker was appropriate for use as a fine aggregate replacement up to 100% in SMA mixture and could satisfy the mix design requirements in terms of Marshall stability, flow, quotient, and volumetric properties. However, the percentage of palm oil clinker replacement as fine aggregate has merely influenced the optimum binder content. Furthermore, there were improvements in the drain down, resilient modulus and indirect tensile fatigue performances of the SMA mixture. In conclusion, the use of POC as fine aggregates replacement in SMA mixture indicates a good potential to be commercialized in flexible pavement construction.

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Rutting analysis of different rubberizsed stone mastic asphalt mixtures: from binders to mixtures

Road Materials and Pavement Design ◽

10.1080/14680629.2021.1950818 ◽

2021 ◽

pp. 1-17

Author(s):

Ayad Subhy ◽

Davide Lo Presti ◽

Gordon Airey ◽

Iswandaru Widyatmoko

Keyword(s):

Asphalt Mixtures ◽

Mastic Asphalt ◽

Stone Mastic Asphalt

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Performance Characterization of Stone Mastic Asphalt using Steel Fiber

Journal of Advanced Industrial Technology and Application ◽

10.30880/jaita.2021.02.02.003 ◽

2021 ◽

Vol 02 (02) ◽

Author(s):

Ekarizan Shaffie ◽

◽

H.A. Rashid ◽

Fiona Shiong ◽

Ahmad Kamil Arshad ◽

...

Keyword(s):

Steel Fiber ◽

Mechanical Performance ◽

Permanent Deformation ◽

Asphalt Mixture ◽

Moisture Susceptibility ◽

Mastic Asphalt ◽

Bitumen Content ◽

Stone Mastic Asphalt ◽

The Stability ◽

Marshall Stability

Stone Mastic Asphalt (SMA) is a gap-graded hot mixture designed to provide higher resistance towards permanent deformation and rutting potential by 30% to 40% more than dense-graded asphalt, due to its stable aggregate skeleton structure. However, compared to other types of hot mix asphalt, SMA unfortunately has some shortcomings in term of its susceptibility towards moisture-induced damage due to its structure and excessive bitumen content in the composition. This research aims to assess the performance of a SMA mixture with steel fiber by enhancing overall stability, abrasion resistance, and, most importantly, moisture susceptibility. This study involved the incorporation of various steel fiber proportions of 0%, 0.3%, 0.5% and 0.7% by the total weight of mixture. The steel fiber modified SMA was made up of 6.0% PEN 60/70 bitumen content. The performance of SMA were evaluated through Marshall stability and flow test, Cantabro loss test and indirect tensile strength test. The results obtained from the testing showed that the incorporation of steel fiber is significantly effective to enhance the resistance towards moisture damage, while increasing the stability and reducing the abrasion loss of SMA mixture, compared to conventional mixture. Overall, it can be concluded that the addition of steel fiber in asphalt mixture specifically SMA, has improved the mechanical performance in the application of asphalt pavement with the optimum steel fiber proportion of 0.3% by the weight of mixture. The developed models between the independent variables and responses demonstrated high levels of correlation. The study found that Response Surface Methodology (RSM) is an effective statistical method for providing an appropriate empirical model for relating parameters and predicting the optimum performance of an asphaltic mixture to reduce flexible pavement failure.

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