Efficient preparation and characterization of calcium alginate-attapulgite composite capsules for asphalt self-healing

Rao, Wenhao; Liu, Quantao; Yu, Xin; Wan, Pei; Wang, Huan; Song, Jiangkai; Ye, Qunshan

doi:10.1016/j.conbuildmat.2021.123931

Cited by 25 publications

(3 citation statements)

References 23 publications

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“…The prepared asphalt samples were subjected to FTIR tests to obtain the relationship between the 1745 cm −1 area and the sunflower oil content in the asphalt binder. Rao et al found that the peak index in equation (2) could be used to determine the rejuvenator content in the asphalt binder [ 38 ].…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Self-Healing Performance of Asphalt Concrete with Ca-Alginate Capsules under Low Service Temperature Conditions

Wang

Liu

et al. 2022

Polymers

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Calcium alginate capsules containing rejuvenators represent a promising method for asphalt concrete premaintenance, but their healing capacities under lower temperature conditions are still unknown. This paper investigated the healing performance of asphalt concrete containing calcium alginate capsules at low service temperatures. The Ca-alginate capsules were synthesized, and their morphology, compressive strength, thermal resistance, and relative oil content were evaluated. Besides, evaluations for the healing of asphalt concrete and the rejuvenator-release ratio of the capsules were determined via fracture-healing-refracture testing and Fourier-transform infrared spectrum experiments. Meanwhile, the glass transition temperature and rheological property of asphalt binder after compressive loading under different temperatures were explored via a differential scanning calorimeter and dynamic shear rheometer. The results showed that the capsules had good thermal resistance and mechanical strength. The capsules released less oil under −15, −10, and −5 ℃ than at 20 ℃, and the healing ratios of the asphalt concrete with the capsules at −15, −10, and −5 ℃ were obviously lower than that at 20 ℃. The released rejuvenator from the capsules could decrease the complex modulus and glass transition temperature of the asphalt binder. When compared with low service temperatures, the asphalt binder containing the capsules and serving at a high temperature has a better softening effect and low-temperature performance due to more oil being released.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Self-Healing Performance of Asphalt Concrete with Ca-Alginate Capsules under Low Service Temperature Conditions

Wang

Liu

et al. 2022

Polymers

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“…Therefore, the rejuvenator can be stored in the gaps of the network structure [98]. Rao et al also innovated the experimental apparatus and successfully fabricated the capsules with industrial raw materials on a large scale in the laboratory [99]. The size of capsules is typically 1.5-3 mm, and the capsule is incorporated into the asphalt concrete as an aggregate.…”

Section: Ca-alginate Capsulementioning

confidence: 99%

A Methodological Review on Development of Crack Healing Technologies of Asphalt Pavement

et al. 2023

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Crack healing has been a key area of asphalt pavement research. In this review, different crack-healing theories and crack-healing evaluation methods in bitumen and asphalt mixtures are summarized and presented. Then different crack healing technologies have highlighted the problems and solutions associated with their implementation. Detailly, traditional technologies (hot pouring and fog seal) are introduced. They mainly fill cracks from the outside, which can effectively prevent further damage to the asphalt pavement, when the cracks have generally developed to the middle and late stages of practical engineering. Their extension of the life of the asphalt pavement is relatively limited. Energy supply technologies (induction and microwave heating) have demonstrated significant efficacy in enhancing the crack healing capability of asphalt pavement, particularly in microcracks. Now, Extensive laboratory testing and some field test sections have been conducted and they are waiting for the promotion from the industry. The agents encapsulated technologies (Saturated porous aggregates encapsulate rejuvenators, Core-shell polymeric microcapsules, Ca-alginate capsule, Hollow fibers and Compartment fibers) not only heal cracks but rejuvenate the aged asphalt pavement. In order to promote industrial application, more field test sections and large industrial mixing and compaction equipment applications need to be implemented. Finally, some other potential crack healing techniques (coupling application, electrical conductivity, 3D printing, and modifications) are also mentioned.

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“…Ca-Alg hydrogels can also be used to prepare composite filtration membranes with nanofiber support layers that can be used for molecule/ion separation owing to their good anti-pollution performance [ 23 , 24 ]. Furthermore, Ca-Alg capsules can be used as building materials that can gradually release healing agents without being ruptured under cyclic traffic loading, and are an economically viable, environmentally friendly, and promising self-healing mix material for asphalt pavement [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Calcium Alginate Production through Forward Osmosis with Reverse Solute Diffusion and Mechanism Analysis

et al. 2023

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Calcium alginate (Ca-Alg) is a novel target product for recovering alginate from aerobic granular sludge. A novel Ca-Alg production method was proposed herein where Ca-Alg was formed in a sodium alginate (SA) feed solution (FS) and concentrated via forward osmosis (FO) with Ca2+ reverse osmosis using a draw solution of CaCl2. An abnormal reverse solute diffusion was observed, with the average reverse solute flux (RSF) decreasing with increasing CaCl2 concentrations, while the average RSF increased with increasing alginate concentrations. The RSF of Ca2+ in FS decreased continuously as the FO progressed, using 1.0 g/L SA as the FS, while it increased initially and later decreased using 2.0 and 3.0 g/L SA as the FS. These results were attributed to the Ca-Alg recovery production (CARP) formed on the FO membrane surface on the feed side, and the percentage of Ca2+ in CARP to total Ca2+ reverse osmosis reached 36.28%. Scanning electron microscopy and energy dispersive spectroscopy also verified CARP existence and its Ca2+ content. The thin film composite FO membrane with a supporting polysulfone electrospinning nanofiber membrane layer showed high water flux and RSF of Ca2+, which was proposed as a novel FO membrane for Ca-Alg production via the FO process with Ca2+ reverse diffusion. Four mechanisms including molecular sieve role, electrification of colloids, osmotic pressure of ions in CARP, and FO membrane structure were proposed to control the Ca-Alg production. Thus, the results provide further insights into Ca-Alg production via FO along with Ca2+ reverse osmosis.

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Efficient preparation and characterization of calcium alginate-attapulgite composite capsules for asphalt self-healing

Cited by 25 publications

References 23 publications

Self-Healing Performance of Asphalt Concrete with Ca-Alginate Capsules under Low Service Temperature Conditions

Self-Healing Performance of Asphalt Concrete with Ca-Alginate Capsules under Low Service Temperature Conditions

A Methodological Review on Development of Crack Healing Technologies of Asphalt Pavement

Calcium Alginate Production through Forward Osmosis with Reverse Solute Diffusion and Mechanism Analysis

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