Soil Mix Cutoff Wall Materials with Microcapsule-Based Self-Healing Grout

2021 ◽  
Vol 147 (11) ◽  
pp. 04021124
Author(s):  
Benyi Cao ◽  
Livia Souza ◽  
Jian Xu ◽  
Wenting Mao ◽  
Fei Wang ◽  
...  
Keyword(s):  
Self Healing ◽  
Cutoff Wall ◽  
Wall Materials ◽  
Soil Mix

scholarly journals Organic Contaminant-Triggered Self-Healing Soil Mix Cut-Off Wall Materials Incorporating Oil Sorbents

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5802
Author(s):  
Benyi Cao ◽  
Livia Ribeiro de Souza ◽  
Abir Al-Tabbaa
Keyword(s):  
Organic Contaminants ◽  
Liquid Paraffin ◽  
Self Healing ◽  
Novel Approach ◽  
Oil Sorbent ◽  
Oil Sorbents ◽  
The Matrix ◽  
Order Of Magnitude ◽  
Wall Materials ◽  
Soil Mix

Soil mix cut-off walls have been increasingly used for containment of organic contaminants in polluted land. However, the mixed soil is susceptible to deterioration due to aggressive environmental and mechanical stresses, leading to crack-originated damage and requiring costly maintenance. This paper proposed a novel approach to achieve self-healing properties of soil mix cut-off wall materials triggered by the ingress of organic contaminants. Oil sorbent polymers with high absorption and swelling capacities were incorporated in a cementitious grout and mixed with soil using a laboratory-scale auger setup. The self-healing performance results showed that 500 µm-wide cracks could be bridged and blocked by the swollen oil sorbents, and that the permeability was reduced by almost an order of magnitude after the permeation of liquid paraffin. It was shown by micro-CT scan tests that the network formed by the swollen oil sorbents acted as attachments and binder, preventing the cracked mixed soil sample from crumbling, and that the oil sorbents swelled three times in volume and therefore occupied the air space and blocked the cracks in the matrix. These promising results exhibit the potential for the oil sorbents to provide soil mix cut-off walls in organically-contaminated land with self-healing properties and enhanced durability.

Synthesis and Self-Healing Mechanism of Self-Healing Epoxy Microcapsule Materials

2020 ◽  
Vol 842 ◽  
pp. 3-9
Author(s):  
Zhuo Ni ◽  
Zhen Guo ◽  
Yu Hao Lin
Keyword(s):  
Epoxy Resin ◽  
Interfacial Polymerization ◽  
Curing Temperature ◽  
Future Research ◽  
Self Healing ◽  
Practical Applications ◽  
The Core ◽  
Good Surface ◽  
Core Content ◽  
Wall Materials

Self-healing epoxy resin microcapsules are prepared by interfacial polymerization, in which the core materials are epoxy resin, the wall materials are constructed with triethylenetetramine and the epoxy resin. The orthogonal experimental L9(34) are designed to investigate the influence of emulsifier dosage, hardener dosage, curing temperature and hardener adding rate on the core content and storage life of epoxy resin microcapsule. Scanning electron microscope is used to characterize surface topography and distribution. Fourier transform infrared spectroscopy is used to study reaction mechanism of the microcapsule wall materials, respectively. The results indicate that when the dosage of emulsifier is 1.2%, the dosage of hardener is 1.2%, the hardener droplets adding rate is 1.2 g/h and the curing temperature is 50°C, the prepared microcapsules with a high level of core content are spherical in shape with good surface compactness and dispersibility. Future research may focus on improving microcapsule storage stability and the obstacles encountered in practical applications.

scholarly journals Vertical Barriers for Land Contamination Containment: A Review

2021 ◽  
Vol 18 (23) ◽  
pp. 12643
Author(s):  
Benyi Cao ◽  
Jian Xu ◽  
Fei Wang ◽  
Yunhui Zhang ◽  
David O’Connor
Keyword(s):  
Performance Monitoring ◽  
Geophysical Methods ◽  
Engineering Properties ◽  
Self Healing ◽  
Barrier Materials ◽  
Soil Ecosystem Services ◽  
Slurry Trench ◽  
Vertical Barriers ◽  
And Performance ◽  
Soil Mix

Soil pollution is one of the major threats to the environment and jeopardizes the provision of key soil ecosystem services. Vertical barriers, including slurry trench walls and walls constructed with soil mix technology, have been employed for decades to control groundwater flow and subsurface contaminant transport. This paper comprehensively reviewed and assessed the typical materials and mechanical and permeability properties of soil–bentonite, cement–bentonite and soil mix barriers, with the values of mix design and engineering properties summarized and compared. In addition, the damage and durability of barrier materials under mechanical, chemical, and environmental stresses were discussed. A number of landmark remediation projects were documented to demonstrate the effectiveness of the use of barrier systems. Recent research about crack-resistant and self-healing barrier materials incorporating polymers and minerals at Cambridge University and performance monitoring techniques were analyzed. Future work should focus on two main areas: the use of geophysical methods for non-destructive monitoring and the optimization of resilient barrier materials.

The first microcapsule-based self-healing cement–bentonite cut-off wall materials

Géotechnique ◽  
2021 ◽  
pp. 1-42
Author(s):  
Benyi Cao ◽  
Lívia Souza ◽  
Fei Wang ◽  
Jian Xu ◽  
Chrysoula Litina ◽  
...  
Keyword(s):  
Self Healing ◽  
Wall Materials

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

Congenital self-healing histiocytosis

1982 ◽  
Vol 118 (4) ◽  
pp. 267-272 ◽  
Author(s):  
E. Bonifazi
Keyword(s):  
Self Healing
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