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A platform for research: civil engineering, architecture and urbanism
Bond strength between concrete and repair mortar and its relation with concrete removal techniques and substrate composition
https://orcid.org/0000-0002-0851-6242
Highlights Aggregate size and porosity affect surface roughness and microcrack density. Good correlation is observed between the measured water transport and bond strength. Effect of water-jetting on the bond strength is dependent on the mix composition. Water-jetting decreases bond strength by affecting the interfacial transition zone.
Abstract This study investigates how concrete removal techniques affect substrates of different compositions, and as a result, the bonding with repair mortar. To this end, substrate surfaces of different concrete compositions, micro-concrete (MC), gravel concrete (GC) and crushed stone concrete (CC), were treated by using three commonly used removal techniques; hydrodemolition/water-jetting (WJ), jack-hammering (JH) and grit blasting (GB). Automated laser measurements (ALM) and the volumetric sand patch technique were employed to determine the surface roughness of the substrates. The effect of the substrates parameters such as aggregate size and uniformity on the bonding and failure modes was investigated. Uniformity of the substrates was evaluated by porosity measurements. According to the results, bond strength, surface tensile strength, failure modes and surface roughness were dependent on the aggregate size, aggregate shape and uniformity of mixture. The largest aggregate size and highest porosity along with the highest microcrack density and roughness belonged to CC mixtures. A high correlation was observed between the measured water transport and bond strength of samples. Micro-cracking and a weak interfacial transition zone (ITZ) seem to be the detrimental factors influencing the bond strength of samples treated with JH and WJ, respectively. The influence of WJ on the bond strength was dependent on the mix composition parameters such as aggregate size.
Bond strength between concrete and repair mortar and its relation with concrete removal techniques and substrate composition
https://orcid.org/0000-0002-0851-6242
Highlights Aggregate size and porosity affect surface roughness and microcrack density. Good correlation is observed between the measured water transport and bond strength. Effect of water-jetting on the bond strength is dependent on the mix composition. Water-jetting decreases bond strength by affecting the interfacial transition zone.
Abstract This study investigates how concrete removal techniques affect substrates of different compositions, and as a result, the bonding with repair mortar. To this end, substrate surfaces of different concrete compositions, micro-concrete (MC), gravel concrete (GC) and crushed stone concrete (CC), were treated by using three commonly used removal techniques; hydrodemolition/water-jetting (WJ), jack-hammering (JH) and grit blasting (GB). Automated laser measurements (ALM) and the volumetric sand patch technique were employed to determine the surface roughness of the substrates. The effect of the substrates parameters such as aggregate size and uniformity on the bonding and failure modes was investigated. Uniformity of the substrates was evaluated by porosity measurements. According to the results, bond strength, surface tensile strength, failure modes and surface roughness were dependent on the aggregate size, aggregate shape and uniformity of mixture. The largest aggregate size and highest porosity along with the highest microcrack density and roughness belonged to CC mixtures. A high correlation was observed between the measured water transport and bond strength of samples. Micro-cracking and a weak interfacial transition zone (ITZ) seem to be the detrimental factors influencing the bond strength of samples treated with JH and WJ, respectively. The influence of WJ on the bond strength was dependent on the mix composition parameters such as aggregate size.
Bond strength between concrete and repair mortar and its relation with concrete removal techniques and substrate composition
https://orcid.org/0000-0002-0851-6242
Highlights Aggregate size and porosity affect surface roughness and microcrack density. Good correlation is observed between the measured water transport and bond strength. Effect of water-jetting on the bond strength is dependent on the mix composition. Water-jetting decreases bond strength by affecting the interfacial transition zone.
Abstract This study investigates how concrete removal techniques affect substrates of different compositions, and as a result, the bonding with repair mortar. To this end, substrate surfaces of different concrete compositions, micro-concrete (MC), gravel concrete (GC) and crushed stone concrete (CC), were treated by using three commonly used removal techniques; hydrodemolition/water-jetting (WJ), jack-hammering (JH) and grit blasting (GB). Automated laser measurements (ALM) and the volumetric sand patch technique were employed to determine the surface roughness of the substrates. The effect of the substrates parameters such as aggregate size and uniformity on the bonding and failure modes was investigated. Uniformity of the substrates was evaluated by porosity measurements. According to the results, bond strength, surface tensile strength, failure modes and surface roughness were dependent on the aggregate size, aggregate shape and uniformity of mixture. The largest aggregate size and highest porosity along with the highest microcrack density and roughness belonged to CC mixtures. A high correlation was observed between the measured water transport and bond strength of samples. Micro-cracking and a weak interfacial transition zone (ITZ) seem to be the detrimental factors influencing the bond strength of samples treated with JH and WJ, respectively. The influence of WJ on the bond strength was dependent on the mix composition parameters such as aggregate size.
Bond strength between concrete and repair mortar and its relation with concrete removal techniques and substrate composition
Yazdi, Mohammad Ali (author) / Dejager, Elien (author) / Debraekeleer, Mats (author) / Gruyaert, Elke (author) / Van Tittelboom, Kim (author) / De Belie, Nele (author)
2019-09-05
Article (Journal)
Electronic Resource
English
How concrete removal techniques affect the bonding between concrete and repair mortar
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