Time Release of Chemicals into Hardened Cementitious Matrices for Crack Repair, Fiber Rebond, and Increase in Flexural Toughening

2009 ◽  
pp. 268-268-15 ◽  
Author(s):  
CM Dry
Keyword(s):  
Crack Repair

scholarly journals Consolidation and Strengthening of Historical Masonry by Means of Mineral Grouts: Grout Development

2015 ◽  
Vol 21 (1) ◽  
pp. 29-45 ◽  
Author(s):  
Dionys Van Gemert ◽  
Sven Ignoul ◽  
Kris Brosens ◽  
Eleni-Eva Toumbakari
Keyword(s):  
Failure Mechanisms ◽  
Brick Masonry ◽  
Historical Overview ◽  
Advantages And Disadvantages ◽  
Crack Repair ◽  
Historical Masonry

Abstract: Mass consolidation of stone and brick masonry is considered, with exclusion of pure crack repair. Damage and specific failure mechanisms in multiple leaf masonry are presented. The aims of consolidation are explained, and the inherent advantages and disadvantages of distinct strengthening and consolidation techniques are given. An historical overview of consolidation methods and of development of consolidation grout materials is given, which explains how technology evolved to the actual procedures.

Eddy current inspection of bonded composite crack repair

1996 ◽  
Author(s):  
Thomas K. Smith, Jr. ◽  
Cornelius Guijt ◽  
Robert Fredell
Keyword(s):  
Eddy Current ◽  
Eddy Current Inspection ◽  
Bonded Composite ◽  
Crack Repair

Quarter crack repair: an overview

2010 ◽  
Vol 13 (4) ◽  
pp. 216-219 ◽  
Author(s):  
S. E. O'Grady
Keyword(s):  
Crack Repair

scholarly journals Use of Genetically Modified Bacteria to Repair Cracks in Concrete

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3912 ◽  
Author(s):  
Zhang ◽  
Weng ◽  
Ding ◽  
Qian
Keyword(s):  
Genetically Modified ◽  
Ct Scanning ◽  
Repair Process ◽  
Bacillus Halodurans ◽  
Calcite Precipitation ◽  
Repair Efficiency ◽  
Crack Repair ◽  
Speed Up ◽  
X Ray Computed ◽  
Sorptivity Test

In this paper, we studied the crack-repair by spraying bacteria-based liquid around the cracks in concrete. To enhance the repair efficiency and speed up the repair process, the transposon mutagenesis method was employed to modify the genes of Bacillus halodurans and create a mutant bacterial strain with higher efficiency of calcium carbonate productivity by catalyzing the combination of carbonate and calcium ion. The efficiency of crack-repairing in concrete by spraying two kinds of bacterial liquid was evaluated via image analysis, X-ray computed tomography (X-CT) scanning technology and the sorptivity test. The results show that the crack-repair efficiency was enhanced very evidently by spraying genetically modified bacterial-liquid as no microbiologically induced calcite precipitation (MICP) was found within the cracks for concrete samples sprayed using wild type bacterial-liquid. In addition, the crack-repair process was also shortened significantly in the case of genetically modified bacteria.

On 3D printing of electro-active PVDF-Graphene and Mn-doped ZnO nanoparticle-based composite as a self-healing repair solution for heritage structures

2021 ◽  
pp. 095440542110609
Author(s):  
Vinay Kumar ◽  
Rupinder Singh ◽  
Inderpreet Singh Ahuja
Keyword(s):  
3D Printing ◽  
Polyvinylidene Fluoride ◽  
Nano Particles ◽  
Zno Nanoparticle ◽  
Self Healing ◽  
Fused Deposition ◽  
Crack Repair ◽  
3D Printed ◽  
Doped Zno ◽  
Mn Doped

Construction is the part of human activity which is directly linked to urbanization for moving ahead on the path of growth and prosperity. Construction activities in past centuries are now part of our precious heritage. The repair and maintenance of heritage structures are of great importance for present-day researchers. One of the most common damage these century-long constructions faces are in form of surface cracks. In the present study, investigations were performed for a 3D printing-based customized solution for crack repair and maintenance of heritage structures. In this study, polyvinylidene fluoride (PVDF) polymer was reinforced with graphene (Gr) and Mn-doped ZnO nano-particles to prepare a smart composite material for crack repair and restoration. The composite was successfully 3D printed on fused deposition modeling (FDM) based 3D printer after investigating its rheological, thermal, and mechanical properties. The in-house developed composite was tested for smart characteristics to use as a programmable solution for filling cracks. The piezoelectric property and dielectric constant of 3D printed disk-shaped composite (PVDF-Gr-Mn-ZnO) were obtained after DC poling (to be used as stimulus) of the functional prototype. The results of the study suggest that the electro-active nature, volumetric change, and charge storing capacity of the additively manufactured composite may be used practically to acquire the shape of cavity/crack present in the constructed wall and repair the damages that occurred in a heritage site. The photoluminescence (PLS) and atomic force microscopy (AFM) analysis was used to ascertain the properties of the prepared composite. Also, the results obtained from the morphological analysis are reported to support the outcomes of the research.

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