Strength Mechanism of Cement-Asphalt Mortar

Wang, Qiang; Yan, Peiyu; Ruhan, A; Yang, Jinmeng; Kong, Xiangming

doi:10.1061/(asce)mt.1943-5533.0000301

Cited by 97 publications

(40 citation statements)

References 3 publications

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“…However, researchers have been often concerned that cement hydration may be hindered by bitumen emulsion because bitumen may form a membrane on the surface of cement particles. Although this viewpoint is not comprehensively supported by experimental results, it has been repeated several times [35,49,50]. In [7,26,45] it has been observed that bitumen emulsion has no substantial influence on the hydration of cement beyond the first few hours of hydration, see Fig.…”

Section: Cement Hydration 34mentioning

confidence: 99%

Overview on cold cement bitumen emulsion asphalt

2016

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Cold mix asphalt, a promising substitute for conventional hot mix asphalt, is manufactured at ambient temperature using bitumen emulsion as binder. To improve its strength and durability, cement is often added to the mixture. This review (1) presents an overview about advances in cold mix asphalt modified with cementitious materials, often called CBEA (cement bitumen emulsion asphalt), (2) illustrates advantages and disadvantages of CBEA and (3) gives recommendations to produce homogenous CBEA mixtures

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Section: Cement Hydration 34mentioning

confidence: 99%

Overview on cold cement bitumen emulsion asphalt

2016

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“…As a kind of inorganic-organic composite, cement-asphalt (hereafter CA) mortar, which consists of Portland cement, asphalt emulsion, water and other related admixtures, is able to combine the high compressive strength of cement and the superb flexibility of asphalt [8][9][10][11]. As a result, in recent decades, CA mortar has been extensively used as a grouting material in the cushion layer of the slab 11 track system of High-Speed Railways (HSR) in China, primarily due to its excellent damping property [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Retardation mechanism of anionic asphalt emulsion on the hydration of Portland cement

Hong²,

Zhu³

et al. 2018

Construction and Building Materials

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Cement-asphalt (CA) mortar, a grouting material consisting of Portland cement (PC), asphalt emulsion, sand, water and other related admixtures, has been widely used as a cushion layer material in 11 the construction of High-Speed Railways (HSR) during the past decade in China due to its excellent damping property. The fresh and hardened properties of CA mortar are closely related to the PC hydration in the presence of asphalt emulsion. However, the retardation effect introduced by the anionic asphalt emulsion on the hydration process of PC has not been fully understood. In this paper, the effect of an anionic asphalt emulsion on the early hydration process of CA paste was first investigated by setting time test, isothermal conduction calorimeter and electrical resistivity. The MIP and SEM were then employed to characterize the microstructure evolution of the CA paste. Based on the data and observation obtained from the experimental study, three possible retardation mechanisms introduced by the anionic asphalt emulsion on the PC hydration were then assessed in this paper, including (i) selective adsorption by anionic emulsifier via electrostatic attraction, (ii) coating formed by the demulsification of anionic asphalt emulsion, and (iii) reduced reactivity of water molecules in anionic asphalt emulsion.

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“…In Figure 12, the needle-like ettringite structure is widely found, it can be deduced that most of the hydration process of the cementititous material happened in the first day. The consumption of the free water during the hydration can promote the connection and breaking of asphalt spheres, because the free water consumption by physical adsorption of the cementitious material is very limited (Wang, et al, 2011). In the 7 days, the breaking of asphalt spheres were almost finished and it was found that most of the formed cement asphalt structure stuck to the surface of the hydration product of cementitious material at the early age.…”

Section: Microstructurementioning

confidence: 99%

“…Right now, 6552 km high speed passenger lines in China is well used and more than 10,000 km new high speed passenger lines is to be completed in the future (China ministry of railway, 2010).The cement asphalt mortar (CA Mortar) is composed of cement asphalt emulsion, sand and several chemical admixtures (Yang, et al, 2010;Torri, et al, 1975;Makoto, et al, 1995;Ryoichi, et al, 2005). It usually applied to the Slab track structure for the high speed railway, as a layer injected between the reinforced pre-stressed concrete slabs (Esveld, 2003).There are two types of CA mortar exist, one with a low elastic modulus and strength used in shinkansen slab track in Japan and the other with a high elastic modulus and strength used in the Bogl slab track in Germany.Both CA mortars were introduced in China and used in the construction of high-speed railway (Wang, et al, 2011). The two temporary technical indices of cement asphalt mortar were issued for Chinese high speed railway: CRTS I with low elastic modulus and CRTS II with high elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

Performance and Microanalysis of Cement Asphalt Mortar With Admixture of Coal Fly Ash

Yao¹,

Sun²

2012

JMSR

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In this study, cement asphalt mortars prepared with three different cementitious material were systematically investigated: C1 ordinary Portland cement, C2sulfoaluminate cement, C3 (sulfoaluminate: ordinary Portland cement: fly ash=3:6:1) according to the technical indices of cement asphalt mortar for Chinese high speed railway (CRTS II). The C2 CA mortar shows early strength due to the early hydration process between the sulfoaluminate cement and water while the workability is not as excellent as C3 group which not only shows great performance in physical and mechanical properties but also has a good fluidity and workable time to meet the requirement of CRTS II. Through the microstructure analysis, it was found that cement asphalt mortar is a porous structure and the hydration between cement and free water happened at the early age while an integrated formed amorphous gel play an important role in the strength development of the CA mortar as the strength development to 28 days.

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Strength Mechanism of Cement-Asphalt Mortar

Cited by 97 publications

References 3 publications

Overview on cold cement bitumen emulsion asphalt

Overview on cold cement bitumen emulsion asphalt

Retardation mechanism of anionic asphalt emulsion on the hydration of Portland cement

Performance and Microanalysis of Cement Asphalt Mortar With Admixture of Coal Fly Ash

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