Shrinkage of High-Performance Concrete Overlays on Route 60 in Virginia

Sprinkel, Michael M; Ozyildirim, Celik

doi:10.3141/1610-03

Cited by 20 publications

(24 citation statements)

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“…In addition, the SB surface treatment improved the bonding quality of the composite more than the GR surface treatment. The strengths of specimens with both GR and SB surface treatments were greatly higher than 2.1 MPa indicating that the bonding quality was excellent (Table ) . All specimens heated at 100, 200, and 300°C experienced substratum failure with good interface (type C); it occurred at the NC substrate as it is weaker than the GUSMRC repair material.…”

Section: Resultsmentioning

confidence: 99%

Interfacial behavior between normal substrate and green ultra‐high‐performance fiber‐reinforced concrete under elevated temperatures

Sabah

Zainal

Bunnori

et al. 2019

Structural Concrete

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This study assesses the effects of elevated temperatures (100, 200, 300, 400, and 500°C) on the bonding behavior of normal concrete (NC) substrate as old concrete and the new Green Universiti Sains Malaysia Reinforced Concrete (GUSMRC) as a repair material through slant shear, pull‐off, splitting tensile, and flexural tests. Sandblasting (SB) and grinding (GR) surface treatments were employed to enhance the bond strength of the NC/GUSMRC composite. The research also evaluates the mechanical characteristics of the GUSMRC mix which 50% of its content is ultrafine palm oil fuel ash prior to and after the exposure to elevated temperatures. The results showed degradation in the mechanical properties of the monolithic GUSMRC and the bonding strength of the NC/GUSMRC composite after exposure to elevated temperatures; however, the bonding quality is excellent. Moreover, the SB surface treatment enhanced the interfacial bonding more than the GR surface treatment before and after elevated temperature exposure.

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Section: Resultsmentioning

confidence: 99%

Interfacial behavior between normal substrate and green ultra‐high‐performance fiber‐reinforced concrete under elevated temperatures

Sabah

Zainal

Bunnori

et al. 2019

Structural Concrete

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“…The relatively small-sized samples did not capture well the influence of moisture on the bond strength, but some distinct behavior was observed between the samples with differential environmental moisture exposure conditions. The general splitting tensile strength of the composite samples indicated an adequate strength level of bonding (>1.4 MPa), based on the quantitative bond strength quality proposed by Sprinkel and Ozyildirim [24]. Generally, improved bonding performance between UHPC and substrate NSC regardless of the moisture content of the substrate can be attributed to the good workability of UHPC which enhanced its capability to fill the pores on the substrate surface [14,25].…”

Section: Chloride Penetrationmentioning

confidence: 99%

Chloride Penetration at Cold Joints of Structural Members with Dissimilar Concrete Incorporating UHPC

et al. 2019

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This research examines the possibility of enhanced chloride transport at the cold joint incorporating UHPC. The effectiveness of the bond on chloride penetration at the concrete interface with various levels of moisture availability for the substrate at the time of UHPC repair was examined. To this effect, the substrate concrete was conditioned to different moisture content including 0%, 75%, and 100% relative humidity, and soaked prior to UHPC repair concrete casting. Chloride penetration was accelerated by an impressed current source and assessed by silver nitrate solution sprayed on the cold joint. Moreover, the tensile bond strength between substrate concrete and UHPC was measured using the splitting tensile test.

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“…Repair material Table 4 [29] shows that they mostly fall within the ''excellent'' range for both normally and microwave cured specimens. The tensile bond strength of the normally and microwave cured CEM II Mortar (Material 4) with the substrate ranges between 1.4 and 1.9 MPa for the ''repair temperatures'' of 20, 10 and 2°C (Fig.…”

Section: Substrate Concretementioning

confidence: 99%

Bond between microwave cured repair and concrete substrate

2017

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The bond strength between a concrete substrate and repair patch is critical to its durability. This paper investigates the effect of microwave curing the freshly applied repair, for 45 min at 132 Watts, on the 28 day bond strength between substrate concrete and different commercial repair materials. The repairs were applied at different ambient temperatures of 20, 10, 2 and -5°C. Tensile split tests on repaired cube specimens were performed to determine the interfacial bond strength. The ability of microwave curing to prevent the detrimental effects of freezing at early age on the bond and compressive strength of repair patches is investigated. Experimental results show that microwave curing prevents loss of long term (28 day) repair/substrate bond strength of repair materials applied at freezing temperatures (-5°C), relative to the repairs applied at higher temperatures (2-20°C), except one lightweight repair formulation. In comparison, the control samples (non-microwave cured) of repairs applied at -5°C suffered severe loss of bond strength and compressive strength due to early age freezing. In addition, no adverse effects on the bond strength and a small reduction of 6.75% in the 28 day compressive strength are observed in the early age microwave cured repairs applied at ambient temperatures of 2-20°C. The repair/substrate bond strength is independent of the compressive strength of the repair material at all temperatures of repair application. Microwave curing can accelerate the concrete repair process and facilitate construction activity in cold weather.

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Shrinkage of High-Performance Concrete Overlays on Route 60 in Virginia

Cited by 20 publications

References 0 publications

Interfacial behavior between normal substrate and green ultra‐high‐performance fiber‐reinforced concrete under elevated temperatures

Interfacial behavior between normal substrate and green ultra‐high‐performance fiber‐reinforced concrete under elevated temperatures

Chloride Penetration at Cold Joints of Structural Members with Dissimilar Concrete Incorporating UHPC

Bond between microwave cured repair and concrete substrate

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