Research on water seepage of cement asphalt emulsified (CA) mortar

Wang, Tao; Hengqiong, Jia; Li, Honggang; Li, Haiyan; Shao, Peng

doi:10.1016/j.conbuildmat.2016.08.071

Cited by 9 publications

(8 citation statements)

References 10 publications

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“…Fine adjustment of slab was a key step in controlling the elevation and smoothness of railway (Murata, 2003; Zeng, Xie, & Deng, 2012a; Zeng, Xie, & Deng, 2012b; Wang, 2013; Song, Zeng, Xie, Long, & Ma, 2020). Theoretically, there was no need to use a height-adjusting gasket under the rail correct orbital condition as it was just the final geometry state of slab after fine adjustment (Department of science & technology of China railway ministry, 2008; Fu, Xie, & Niu, 2016; Wang, Jia, & Li, 2016). However, according to the engineering practice, uneven rail-bearing surface of one slab and stagger step between two slabs occur frequently after CA mortar grouting, which lead to lift up or gap between slabs, will finally affect the smoothness of the rail (Coenraad, 2003; Wang, Liu, & Hu, 2010; Zeng, Xie, & Deng, 2016; Deng, Ye, Yuan, & Wang, 2016).…”

Section: Introductionmentioning

confidence: 99%

Influences of cement asphalt emulsified mortar construction on track slab geometry status

Wang,

Wu,

Jia

et al. 2023

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PurposeThe construction of cement asphalt (CA) emulsified mortar can obviously disturb the slab status after the fine adjustment. To decrease or eliminate the influence of CA mortar grouting on track slab geometry status, the effects of grouting funnel, slab pressing method, mortar expansion ratio, seepage ratio and grouting area on China Railway Track System Type (CRTS I) track slab geometry status were discussed in this paper.Design/methodology/approachCombined with engineering practice, this paper studied the expansion law of filling layer mortar, the liquid level height of the filling funnel, the pressure plate device and the amount of exudation water and systematically analyzed the influence of filling layer mortar construction on the state of track slab. Relevant precautions and countermeasures were put forward.FindingsThe results showed that the track slab floating values of four corners were different with the CA mortar grouting and the track slab corner near CA mortar grouting hole had the maximum floating values. The anti-floating effect of “7” shaped slab pressing device was more efficient than fixed-joint angle iron, and the slab floating value could be further decreased by increasing the amount of “7” shaped slab pressing devices. After CA mortar grouting, the track slab floating pattern had a close correlation with the expansion rate and water seepage rate of CA mortar over time and the expansion and water seepage rate of the mortar were faster when the temperature was high. Furthermore, the use of strip CA mortar filling under the rail bearing platform on both sides could effectively reduce the float under the track slab, and it could also save mortar consumption and reduce costs.Originality/valueThis study plays an important role in controlling the floating values, CA mortar dosage and the building cost of projects by grouting CA mortar at two flanks of filling space. The research results have guiding significance for the design and construction of China's CRTS I, CRTS II and CRTS III track slab.

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Section: Introductionmentioning

confidence: 99%

Influences of cement asphalt emulsified mortar construction on track slab geometry status

Wang,

Wu,

Jia

et al. 2023

Self Cite

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“…To date, much effort has been directed towards the exploration of relevant properties for CA mortar due to its crucial role in safety and life control for railway track structures. Generally, three major categories can be identified in present research topics referring to CA mortar: (a) physical and chemical properties of fresh CA mortar [9][10][11][12][13][14][15][16][17][18][19], which mainly incorporate the properties of rheology, water absorption and expansibility, seepage, and expansibility; (b) mechanical properties of hardened CA mortar [8,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], where particular attention is chiefly paid to the issues of critical compressive strength, Young's modulus, strain-stress relationship, strain rate effect, and temperature sensitivity; (c) investigations of the durability properties of hardened CA mortar [37][38][39][40][41][42][43][44][45][46][47], which primarily aim at the behaviors of fatigue properties, creep and stress relaxation, freezing resistance, and water erosion. 2…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Stochastic Mechanical Behavior of Cement Emulsified Asphalt Mortar under Monotonic Compression

Xiao

Liu

et al. 2020

Applied Sciences

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Experimental investigation on cement emulsified asphalt mortar (CA mortar) under uniaxial monotonic compression by taking into account the stochastic properties were investigated. An analytical constitutive model based on the statistic damage approach capable of mimicking the stochastic mechanical responses of CA mortar under uniaxial compression was proposed. The comparison between the experimental results and the predictions demonstrated that the proposed model was able to characterize the salient features for CA mortar under uniaxial monotonic compression. Furthermore, the compressive stochastic evolution (SE) of CA mortar tested in this work and comparative analyses among typical China Railway Track System-I (CRTS-I) type CA mortar and concrete in several aspects were examined and performed; it was revealed that the Lognormal distribution density function can well represent the damage probability density for CA mortar, and its stochastic constitutive relationship can be reflected by a media process of transition from microscale to macroscale.

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“…The cement asphalt emulsified mortar (CA mortar) filled in the 40mm~60mm flat space between the track slab and base plate is an important filling material of CRTS I ballastless track, and CA mortar is an elastic interlayer, which plays a key role as shock absorbing of the slab track, and it consists of cement, asphalt emulsified, fine aggregate and a variety of organic admixtures. It is a high performance semi-rigid composite which combining the merits of high strength from cement paste and good elasticity from asphalt materials [4][5][6]. CA mortar is a highly flowable grouting material, requiring a workable time beyond 45 min.…”

Section: Introductionmentioning

confidence: 99%

Early Hardening Process of CA Mortar Indicated by Electrical Resistivity

Wang

Hengqiong

et al. 2020

Advances in Transdisciplinary Engineering

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A non-contact electrical resistivity measurement device was employed to indicate the early hardening process of cement asphalt emulsified mortar (CA mortar). It was found that this process was analogous with the hydration process of cement and could be categorized into three parts: dissolving period, induction period and setting period. The mortar resistivity first decreased and then increased with the elapsed time. The effect of water/cement ratio (W/C), asphalt emulsified/cement ratio (A/C), cement types were also explored. Results indicated that the increase of W/C, dosages in SF (Silica fume) extended the induction period; replacement of Portland cementII with sulfoaluminate cement in CA mortar markedly increased the electrical resistivity and advanced the onset of setting period by 5∼6 h, making it possible to prepare CA mortar with high early strength, which can preventing distress such as peeling and bleeding during construction in winter and conformance to requirements in acceptance standard.

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Research on water seepage of cement asphalt emulsified (CA) mortar

Cited by 9 publications

References 10 publications

Influences of cement asphalt emulsified mortar construction on track slab geometry status

Influences of cement asphalt emulsified mortar construction on track slab geometry status

Experimental Investigation of Stochastic Mechanical Behavior of Cement Emulsified Asphalt Mortar under Monotonic Compression

Early Hardening Process of CA Mortar Indicated by Electrical Resistivity

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