نتایج جستجو برای: self healing concrete
تعداد نتایج: 656109 فیلتر نتایج به سال:
Improved autogenous healing capacity of concrete using superabsorbent polymers (SAPs) was used as an efficient approach for mitigating damage between steel rebar and self-consolidating (SCC). The results normal (NC) those SCC mixtures were compared. Two SAPs with different particle sizes chemical compositions in the experimental program. Results showed that despite greater reduction effect SAP ...
Preparation and Characterization of Poly (urea- Formaldehyde) Walled Dicyclopentadiene Microcapsules
Poly (urea-formaldehyde) (PUF) shelled dicyclopentadiene (DCPD) microcapsules were prepared by in-situ polymerization technology for self-healing concrete applications. It’s found, during the process, sodium dodecyl benzene sulfonate (SDBS) behaves better in emulsification of DCPD than other surfactant of sodium lauryl sulfate (SLS) and styrene maleic anhydride copolymer (SMA), and the addition...
The self-healing capability of cracks plays an important role in improving the durability concrete. This study investigated mortar with crystalline admixture and fly ash under three conditions. compressive strength, water absorption, surface crack pattern were used to evaluate mortar, composition healing products was analyzed by x-ray diffraction scanning electron microscopy. results indicated ...
• A novel 3D printed vascular system is proposed to develop self-healing cementitious composites. The developed composites show significantly increased fracture toughness than plain mortar. numerical finite element model shows good accuracy of simulating the influence printing parameters on behavior exhibit healing efficiency, high flexural strength regain by found after epoxy. Cracking one mai...
Although steel reinforcements are used to withstand tensile forces in concrete, cracks an unavoidable phenomenon. The presence of cracks, fact, increases the risk for lowering service life and durability concrete structures. A critical issue occurs when due splitting forces, appear along tensioned rebars which damage bonding between matrix. As a mitigation plan, should be healed at short notice...
Abstract Concrete is a well-known versatile material, and its application very common in most structures. performance high compression but low tensile strength, this leads to the appearance of microcracks when structure bears designed loading. Such ignored, leaves vulnerable attacks such as seepage water, chlorides, other materials that lead reduction performance, extreme cases failure structur...
Concrete is a prerequisite material for infrastructural development, which required to be sufficiently strong and durable. It consists of fine, coarse, aggregate particles bonded with fluid cement that hardens over time. However, micro cracks development in concrete significant threat its durability. To overcome this issue, several treatments maintenance methods are adopted after construction, ...
This study focuses on the evaluation of efficiency a low-cost macrocapsule, using commercially available pharmaceutical capsules with specific modifications, for self-healing concrete. The macrocapsules were developed by Belgian Building Research Institute in previous study. healing agent is resin based alkyd-urethane, commercial product, which was selected its compatibility concrete and shell,...
The rapidly growing world population and booming economies are two of the major reasons for an increasing demand for buildings and infrastructure. In order to meet these needs large amounts of energy and raw materials are required. In most cases concrete is the main building material for these structures. The question today is how these needs can be accomplished without compromising the ability...
In recent decades, the use of self-consolidating concrete has become widespread. Hence, recognizing the various properties of self-consolidating concrete are essential. In this study, several mixture designs have been tested and final mixture design of crushed tile aggregates which were replaced by 0%, 25 %, 50%, and 100% volume percentage of natural aggregates were conducted. To evaluate fresh...
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