A microstructural approach to adherence mechanism of cement and asphalt mortar (CA mortar) to repair materials

Liu, Yunpeng; Wang, Fazhou; Liu, Muyu; Hu, Shuguang

doi:10.1016/j.conbuildmat.2014.05.020

Cited by 41 publications

(12 citation statements)

References 12 publications

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“…Segments with warped slabs are detected, and the severity of SWD is shown clearly The prefabricated slab is 20 cm thick, 6.45 m long, and 2.55 m wide, and concrete strength grade is C55. As a longitudinal continuous structure, the slabs are connected through the joint between slabs [8] and are bonded to concrete base (C15 concrete cast in place, 30 cm thick, 6.80 m long, and 3.30 m wide) firmly by CA mortar layer (30 mm thick) [18], which is injected afterwards to serve as a cushion layer and shock-absorber [39,41,42].…”

Section: Test Results and Validationmentioning

confidence: 99%

“…It was found by Zhu and Cai [6] that the temperature difference between the top and bottom surfaces of track slab can reach over 16 • C. The temperature gradient load induced by the great temperature differential may result in the generation of pulling and curling stresses in the prefabricated concrete slabs [32] and structural defects. Typical temperature-induced slab track defects include interface debonding/delamination between CA mortar and track slab [4,7,12,18,25,26,32,39], decreased compressive strength, cracking and damage of CA mortar [9,15,16,33,35,[40][41][42], wide and narrow juncture defects [8], warping deformation of track slab [13,16,26,38], etc.…”

Section: Temperature-induced Slab Defects and Warping Deformationmentioning

confidence: 99%

“…The track components from top to bottom are CN60 rail, fastener, track slab, CA mortar layer, and concrete base, as shown in Figure 12. 3.30 m wide) firmly by CA mortar layer (30 mm thick) [18], which is injected afterwards to serve as a cushion layer and shock-absorber [39,41,42]. Several on-site observations show that in the high-temperature season, the prefabricated slabs are prone to warping deformation, which can further cause damages of joint concrete, debonding of the CA mortar layer, etc.…”

Section: Crtsii Slab Trackmentioning

confidence: 99%

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Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Liu

2019

Sensors

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Slab track is widely used in many newly built high-speed rail (HSR) lines as it offers many advantages over ballasted tracks. However, in actual operation, slab tracks are subjected to operational and environmental factors, and structural damages are frequently reported. One of the most critical problems is temperature-induced slab-warping deformation (SWD) which can jeopardize the safety of train operation. This paper proposes an automatic slab deformation detection method in light of the track geometry measurement data, which are collected by high-speed track geometry car (HSTGC). The characteristic of track vertical irregularity is first analyzed in both time and frequency domain, and the feature of slab-warping phenomenon is observed. To quantify the severity of SWD, a slab-warping index (SWI) is established based on warping-sensitive feature extraction using discrete wavelet transform (DWT). The performance of the proposed algorithm is verified against visual inspection recorded on four sections of China HSR line, which are constructed with the China Railway Track System II (CRTSII) slab track. The results show that among the 24,806 slabs being assessed, over 94% of the slabs with warping deformation can be successfully identified by the proposed detection method. This study is expected to provide guidance for efficiently detecting and locating slab track defects, taking advantage of the massive track inspection data.

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Section: Test Results and Validationmentioning

confidence: 99%

Section: Temperature-induced Slab Defects and Warping Deformationmentioning

confidence: 99%

Section: Crtsii Slab Trackmentioning

confidence: 99%

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Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Liu

2019

Sensors

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“…CEA mortars need to have good coordination deformation ability and interface bond strength with the concrete slab when used as a bedding layer between the track slab and the concrete foundation or as repair materials. However, researches by Liu et al [6] and Peng et al [7] indicated that CEA mortars do not yield sufficient interfacial bond strength with cement concrete. Measures to improve the bond strength of CEA mortars have received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Partially Replacing the Emulsified Asphalt in Cement Emulsified Asphalt Mortars with Epoxy Emulsion: Mechanical Properties and Durability Study

Huang

et al. 2021

Advances in Materials Science and Engineering

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Cement emulsified asphalt (CEA) mortars achieve insufficient bond strength with substrate cement concrete slab. To ameliorate problems emerging from this, the emulsified asphalt (EA) in CEA mortars was partly replaced by epoxy emulsion (EE) at contents of 0%, 10%, 20%, and 30%, yielding CEA mortars with enhanced properties. The bond strength, mechanical strength, toughness, and durability (including drying shrinkage and erosion resistance) of modified CEA mortars were assessed. The results showed that partial replacement of EA with EE improved the bond strength, mechanical strength, drying shrinkage, and erosion resistance of CEA mortars. A good correlation was found between the proportions of the EE replacement and the bond strength of CEA mortars. Partial replacement of EA with a small amount of EE exerted no significant effect on the toughness of CEA mortar. The stronger network structure of CEA mortars containing EE improved the compactness, thus improving the performance of CEA mortars. Based on these findings, EE is suggested as partial replacement of EA for enhancing the properties of CEA mortars.

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“…The treatment of a concrete substrate is commonly used for cleaning, removing the laitance layer, and roughening the surface. However, it can induce micro cracking if it is not well operated with regard to the quality and strength of concrete (Courard et al 2006;Courard et al 2014;Garbacz et al 2005;Liu et al 2014;Qian et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Performance of Cement-Based Patch Repair Materials in Plain and Reinforced Concrete Members

Al-Saidy

2016

Jou. Eng. Res.

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Structural elements such as beams, slabs, and columns may require strengthening or repair during their service life. Different repair materials (RMs) are available and it is usually difficult to choose the best ones, especially when considering the cost of such materials. This paper presents the results of an experimental investigation of patch RMs on plain concrete prisms as well as on reinforced concrete beams. Three cement-based RMs available in the market with different mechanical properties and an ordinary Portland cement (OPC) mix produced in the lab were used in the study. Damage was induced in prisms/beams and then repaired using different materials. The experimental work included assessment of the flexural strength of damaged/repaired plain concrete prisms; slant shear (bond) strength between the concrete and the RM; axial strength of damaged/repaired plain concrete prisms and bond of the repair materials in damaged/repaired reinforced concrete beams loaded to failure. The test results showed that all RMs performed well in restoring the strength of damaged plain concrete. Compatibility of the RMs with substrate concrete was found to be more important in the behavior than superior mechanical properties of the RMs. No difference was noted in the behavior between the RMs in repairing reinforced concrete beams at the tension side.

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A microstructural approach to adherence mechanism of cement and asphalt mortar (CA mortar) to repair materials

Cited by 41 publications

References 12 publications

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Partially Replacing the Emulsified Asphalt in Cement Emulsified Asphalt Mortars with Epoxy Emulsion: Mechanical Properties and Durability Study

Performance of Cement-Based Patch Repair Materials in Plain and Reinforced Concrete Members

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