Thermal and Mechanical Properties of Calcium Alginate Capsules for Self-Healing Asphalt Concrete

2021 ◽  
Vol 1041 ◽  
pp. 101-106
Author(s):  
Sergey Inozemtcev ◽  
Evgeniy Korolev ◽  
Toan Do Trong
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Calcium Alginate ◽  
Breaking Load ◽  
Self Healing ◽  
Thermal And Mechanical Properties ◽  
Strength Index ◽  
Alginate Capsules ◽  
Maximum Decrease ◽  
Loss Of Strength

The key physical and mechanical property is the strength of the capsules, which ensure the implementation of the self-healing technology, in which the capsules are not destroyed during the compaction of the asphalt concrete mixture, but are destroyed during the formation of defects in the asphalt concrete. An increase in the content of the reducing agent in the composition of the alginate emulsion leads to a decrease in the breaking load during compression of the capsules, which is explained by an increase in their diameter. But the change in the content of sodium alginate does not have a significant effect on mechanical properties. As a result of exposure to a temperature of 170 °C, a decrease in the strength of the capsules by 22 % after 1 hour of exposure in the burning oven is observed, and with an increase in the time to 4 hours, the strength decreases by 46.9 %. The maximum decrease in the strength index after 4 hours of exposure at a temperature of 160 °C reaches 29.9 %. A decrease in temperature to 150 °C leads to a decrease in the loss of strength. The strength of the capsules decreases by 4 % after 4 hours of exposure at 150 °C. Exposure of capsules to a temperature of 140 °C has no significant effect on strength.

scholarly journals Investigation of the Potential Use of Calcium Alginate Capsules for Self-Healing in Porous Asphalt Concrete

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 168 ◽  
Author(s):  
Shi Xu ◽  
Xueyan Liu ◽  
Amir Tabaković ◽  
Erik Schlangen
Keyword(s):  
Asphalt Concrete ◽  
Calcium Alginate ◽  
Self Healing ◽  
Stiffness Modulus ◽  
Porous Asphalt ◽  
Alginate Capsules ◽  
Asphalt Mix ◽  
X Ray Computed ◽  
Indirect Tensile ◽  
Porous Asphalt Concrete

Improving the healing capacity of asphalt is proving to be an effective method to prolong the service life of an asphalt pavement. The calcium alginate capsules encapsulating rejuvenator have been developed and proved to provide successful localized crack healing in asphalt mastic. However, it is not known whether this self-healing asphalt system will improve healing capacity of a full asphalt mix. To this aim, this paper reports on study which investigate effect of the calcium alginate capsules onto self-healing capacity of the porous asphalt mix. X-ray computed tomography (XCT) was used to visualize the distribution of the capsules in porous asphalt. The effect of the capsules on fracture resistance of porous asphalt concrete was studied by semi-circular bending (SCB) tests. A semi-circular bending and healing programme was carried out to evaluate the healing effect of these capsules in porous asphalt concrete. Indirect Tensile Stiffness Modulus (ITSM) tests were employed in order to investigate the influence of the capsules on the stiffness of the porous asphalt concrete. The results indicate that incorporating calcium alginate capsules significantly improve the healing capacity of porous asphalt concrete without compromising its performance.

MECHANICAL PROPERTIES OF WARM MIXED USING POLYMER RECLAIMED ASPHALT WITH NEW AGGREGATE (PRAP-WARM MIX)

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Weerakaset Suanpaga
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Engineering Properties ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Mixing Process ◽  
Warm Temperature ◽  
Strength Index ◽  
Reclaimed Asphalt ◽  
New Material

The purpose of this study is to determine the appropriated mixed proportion of asphalt concrete using Polymer Reclaimed Asphalt Pavement, new aggregate and Advera (PRAP-Warm Mixed) that were mixed at warm temperature. Then the Mechanical Properties of new mixed asphalt concrete samples were tested following the standards of the Department of Highway, Thailand. In experimental design, the range of mixing temperature varied as 140°C, 145°C, 150°C, 155°C, and percentage of Advera added varied at 0.20, 0.25, 0.30 and 0.35 percent by weight of aggregate. The engineering properties of PRAP samples obtained from this study showed that the optimum mixing ratio was 0.20 percent at 140°C has a Stability value of 2530 lbs, a flow of 12 in a particle size of VMA 16.2, a strength index, 85 percent of the test results are in line with the requirements of the Department of Highways. Then using 70 percent of PRAP-warm mix with 30 percent of new material at 140°C and add 0.20 percent of Advera that is the best-mixed proportion. The normal temperature of PMA mixing is higher than 170°C, in this case using PRAP-Warm mix can reduce temperature lesser than 150°C then this mixing process can save fuel consumption. Thus this study is useful for environmental perspectives.

scholarly journals Technological Features of Production Calcium-Alginate Microcapsules for Self-Healing Asphalt

2018 ◽  
Vol 251 ◽  
pp. 01008 ◽  
Author(s):  
Sergey Inozemtcev ◽  
Evgeniy Korolev
Keyword(s):  
Sodium Alginate ◽  
Calcium Alginate ◽  
Reducing Agent ◽  
Self Healing ◽  
Single Drop ◽  
Alginate Capsules ◽  
Formulation Factors ◽  
Suspension Preparation

The effect of the formulation factors of calcium-alginate suspension preparation on the properties of calcium-alginate microcapsules was studied. The maximum useful volume of the reducing agent is set it was established, up to 93.8% of the total volume, in microcapsules, from the beating, to retain 2.31% sodium alginate and 10.5% reducing agent. The proposed mechanism for the formation of calcium-alginate capsules, which occurs due to shrinkage during the drying of a single drop of suspension, breaking the emulsion and forming an integral shell with a nucleus from the reducing agent.

scholarly journals Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt

2019 ◽  
Vol 9 (3) ◽  
pp. 468 ◽  
Author(s):  
Shi Xu ◽  
Amir Tabaković ◽  
Xueyan Liu ◽  
Damian Palin ◽  
Erik Schlangen
Keyword(s):  
Calcium Alginate ◽  
Mechanical Response ◽  
Asphalt Mixture ◽  
Environmental Scanning ◽  
Self Healing ◽  
R Ratio ◽  
Capsule Shell ◽  
Alginate Capsules ◽  
Asphalt Mix ◽  
Healing Agent

It has been demonstrated that calcium alginate capsules can be used as an asphalt healing system by pre-placing rejuvenator (healing agent) into the asphalt mix and releasing the rejuvenator on demand (upon cracking). This healing mechanism relies on the properties of capsules which are determined by the capsule preparation process. In this study, to optimize the calcium alginate capsules, capsules are prepared using varying Alginate/Rejuvenator (A/R) ratios. Light microscope microscopy and Environmental Scanning Electron Microscope (ESEM) are employed to characterize the morphology and microstructure of these capsules. Thermal stability and mechanical property are investigated by thermogravimetric analysis (TGA) and compressive tests. The testing results indicate that higher alginate content results in smaller diameter and lower thermal resistance, but higher compressive strength. The optimum A/R ratio of calcium alginate capsules is found to be 30/70. To prove the effectiveness of the optimized capsules, the capsules are embedded in asphalt mortar beams and a bending and healing program is carried out. The effect of capsule shell material on the mechanical response of asphalt mixture is evaluated through three-point bending on the mortar beams embedded with blank capsules (without the healing agent). Aged mortar beams containing alginate capsules encapsulating rejuvenator demonstrate a higher strength recovery after bending tests, which indicates effective healing due to the release of the rejuvenators from the capsules.

scholarly journals Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Balaji Krishnakumar ◽  
Debajyoti Bose ◽  
Manjeet Singh ◽  
R. V. Siva Prasanna Sanka ◽  
Velidi V. S. S. Gurunadh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Activated Carbon ◽  
Sugarcane Bagasse ◽  
Epoxy Matrix ◽  
The Self ◽  
Self Healing ◽  
Thermal And Mechanical Properties ◽  
Healing Efficiency ◽  
Sustainable Materials ◽  
Lower Temperature

Vitrimeric materials have emerged as fascinating and sustainable materials owing to their malleability, reprocessability, and recyclability. Sustainable vitrimeric materials can be prepared by reinforcing polymeric matrix with bioderived fillers. In the current work, a sustainable vitrimer is prepared by incorporating biomass-derived activated carbon (AC) filler into the epoxy matrix to achieve enhanced thermal and mechanical properties. Thus, prepared biocomposite vitrimers demonstrate a lower-temperature self-healing (70°C for 5 min) via disulfide exchanges, compared to the pristine epoxy vitrimers (80°C for 5 min). Significantly, the self-healing performances have been studied extensively with the flexural studies; and changes in material healing efficiency have been demonstrated based on the observed changes in modulus.

MECHANICAL PROPERTIES OF WARM MIX ASPHALT CONCRETE APPLICATION USING ADVERA

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Weerakaset Suanpaga ◽  
Watcharin Witayakul ◽  
Somsak Chotichanathawewong ◽  
Thaweesak Piti-khunpongsuk
Keyword(s):  
Mechanical Properties ◽  
Flow Rate ◽  
Asphalt Concrete ◽  
Warm Mix Asphalt ◽  
Strength Index ◽  
Specification Test ◽  
Asphalt Cement ◽  
Adhesive Mixtures ◽  
Air Void ◽  
General Standard

The article presents the study of physical characteristics of warm mix asphalt cement concrete (WMA), components designed by the Marshall Method. Stability, flow rate, strength index, air void, and percent voids in mineral aggregate (VMA) of a total of 77 specimens were examined as a general standard specification test of the Department of Highways, Thailand. Limestone was used as aggregate. Adhesive mixtures of asphalt grade 60/70 were mixed with admixture “ADVERA” to the ratios of 0.20%, 0.25%, and 0.30% by weight of aggregate. WMA-mixing and compaction temperatures were controlled at 115°C, 120°C, and 125°C. The results were that the asphalt cement mixed with 0.25% of ADVERA (by total mixed) at 125°C shows the best mechanical properties standard, with higher value of stability (2,200lbs, i.e., more than the standard 1,800lbs), flow rate, air void, VMA and hardness index. Finally, this study indicates that asphalt concrete added with admixture ADVERA (WMA) could reduce the mixing and compaction temperature during production processes from >160°C to ≤ 125°C.

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