A Review of Detection, Evaluation and Repair Technology for Hydraulic Concrete Structures

2013 ◽  
Vol 690-693 ◽  
pp. 805-810
Author(s):  
Li Ying Xiao
Keyword(s):  
Concrete Structures ◽  
Evaluation Methods ◽  
Significant Progress ◽  
Hydraulic Concrete ◽  
Large Dams ◽  
Repair Technology ◽  
Repair Materials ◽  
Detection Evaluation ◽  
Detection Technologies ◽  
Japan And China

This paper provides a review of the progress in America, Europe, Japan and china withnumerous standardizations and investigations for the protection and repair of hydraulic concrete structures.These researches include detection technologies, evaluation methods, applications of newconcrete reinforcing and repair materials. This paper identifies the significant progress made by theInternational Commission on Large Dams(ICOLD).At the same time, some specific investigations are carried out on the ageing of hydraulic concrete structures in china. On this basis, the detection, assessment and remediation analysis of hydraulic concrete structures are summed up, and someadvice is put forward to the next stage of work.

scholarly journals Adhesion characteristics of geopolymer mortar to concrete and rebars

2019 ◽  
Vol 258 ◽  
pp. 01012 ◽  
Author(s):  
Sanjay Pareek ◽  
Hiroo Kashima ◽  
Ippei Maruyama ◽  
Yoshikazu Araki
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Concrete Structures ◽  
Acid Resistance ◽  
Steel Plates ◽  
Alkali Concentration ◽  
Reinforced Concrete Structures ◽  
Interfacial Zone ◽  
Adhesion Properties ◽  
Repair Materials

In recent years, geopolymers have gained a wide attention as highly ecological-friendly building materials, having a capability to cut down 70% of CO2 emissions in comparison to the ordinary cement concrete. In this study, geopolymer mortars are proposed as repair materials for reinforced concrete structures, due to their superior acid resistance, heat resistance and high strength in comparison to the existing repair materials. The objective of this study is to investigate the adhesion properties of geopolymer mortars to concrete substrates with different surface treatments, steel plates and rebars. As a result, the geopolymer mortars are found to have excellent adhesion properties to dry concrete substrates, steel plates and rebars. Concrete substrates treated with grinder, further enhanced the adhesion properties of geopolymer mortars. On the other hand, poor adhesion of geopolymer mortars to wet concrete substrates was observed due to the presence of water on the interfacial zone, which decreased the alkali concentration of the geopolymer, resulting in lower adhesion strength. In general, geopolymer mortars are found to have suitable adhesion properties to the concrete substrates, steel plates and rebars and can be applied as repair materials for reinforced concrete structures.

Strength Development Characteristic of Cementless Mortar for Repair of Concrete

2018 ◽  
Vol 774 ◽  
pp. 277-282
Author(s):  
Gum Sung Ryu ◽  
Kyung Taek Koh ◽  
Gi Hong An ◽  
Hyeong Yeol Kim ◽  
Sung Choi
Keyword(s):  
Concrete Structures ◽  
Strength Development ◽  
Alkali Activation ◽  
Curing Conditions ◽  
Granulated Blast Furnace Slag ◽  
Repair Materials ◽  
Binder Ratio ◽  
Development Characteristic ◽  
High Bond ◽  
High Bond Strength

Repair materials for concrete structures are often required to exhibit high bond strength at a concrete substrate, and it typically consists of ordinary Portland cement (OPC) incorporating expensive admixtures at a low water-to-binder ratio. Meanwhile, cementless mortar employs alkali-activation of cementless and pozzolanic precursors such as ground granulated blast-furnace slag (GGBFS) and fly ash (FA). The final product develops strength relatively faster than OPC, and its strength can be flexibly talyored by controlling the type and dosage of the activator. The present study investigates the strength development characteristic of cementles mortar for use in repair of concrete structures. Independent variables include mix proportions and curing conditions, which were chosen to optimize the performance of the cementless mortar.

scholarly journals Evaluation of the Compatibility of Repair Materials for Concrete Structures

2017 ◽  
Vol 11 (3) ◽  
pp. 435-445 ◽  
Author(s):  
Giri Venkiteela ◽  
Matthew Klein ◽  
Husam Najm ◽  
Perumalsamy Naidu Balaguru
Keyword(s):  
Concrete Structures ◽  
Repair Materials
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