Concrete

A Two-Stage Corrosion Protection System for Reinforced Concrete Structures

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Electrochemical corrosion protection techniques including impressed current cathodic protection (ICCP), galvanic corrosion protection (GCP) and electrochemical treatments (ECE and Re-Alk) are well known and widely used to protect reinforced concrete structures globally. Each of these techniques have inherent advantages and disadvantages which […]

Impregnation Technique Extends the Service Life of Post-Tensioned Bridges with Grout Defects

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Many bridges and other structures have been constructed using grouted post-tension (PT) tendons. Problems with grouting techniques and grout materials has resulted in grout voids, chloride contaminated grout, and segregated grout. Subsequently corrosion of the PT tendons can occur and some tendons […]

Proposed Recommended Practice for Coating Dry Film Thickness Measurement Over Concrete

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Non-Destructive Testing [NDT] techniques used within or over concrete are less standardized than equivalent tests for Metal Substrates. Guidelines may differ between manufacturers, specifications and supplier details, limiting the effectiveness of NDT techniques for evaluation of concrete structures. Coatings over concrete have […]

Materials Characterisation and Concrete Durability

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract In the last decades, materials characterisation techniques have been employed in assessment of various types of newly-developed concretes such as geopolymer concrete, recycled and by-product concretes and fibre and nanofibre concretes. Characterisation have been also used to understand durability issues resulted from […]

Durability Design for Concrete Immersed in Seawater or Brine.

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract It is well recognised that concrete fully immersed in seawater does not typically suffer from damage induced by reinforcement corrosion during 100 year design lives. Hence, Australian Codes have much lower prescriptive requirements for immersed concrete than for concrete in the splash […]

Durability Design Developments For fib Model Code 2020

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Model Code 2020 will be a single code incorporating both new and existing concrete structures, that is both the design of new structures and all the activities associated with the assessment, interventions and the through-life management and care of existing concrete structures. […]

Durability of Concrete in Tunnels

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract   Tunneling for road and rail infrastructure enables expansion of networks beneath our cities and limits encroachment of these networks into existing developed surface sites. But this is not without its challenges – particularly when it comes to ensuring these tunnels can […]

Neutralization and Corrosion of Geopolymer mortar in an Aggressive Sewer Environment

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract This study aims to evaluate the performance of low calcium fly ash based geopolymer (FA-GPm) and alkali-activated slag based mortars (AASm) in comparison to sulphate resistant Portland cement mortar (SRm) in an aggressive sewer environment. pecimens were extracted from field exposure after […]

‘Do Nothing’ and Patch Repair (without Anodes) Engineered Maintenance Experiences of Marine Concrete Structures

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Extended performance is quite reasonably expected of our reinforced concrete structures, some like marine structures are in aggressive environments, they may be many decades old, of critical importance in terms of function and/or location, and irreplaceable, etc. such that repair and protection […]

A Theoretical and Practical Review of Half Cell Potential Measurements for Assessing Reinforcement Corrosion

[vc_row][vc_column][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf545d605d” show_label=”yes” el_class=” “][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf51dd605c” show_label=”yes”][vc_acf field_group=”3279″ field_from_3279=”field_5b7cf568d605e” show_label=”yes”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text] Abstract Early identification of infrastructure materials degradation can provide significant economic benefits to the management and maintenance of a structure. For reinforced concrete structures, there is a significant delay between corrosion initiation and visible evidence of deterioration. The recommended maintenance approach can vary […]