Research on water transport behaviors and hydration characteristics of internal curing pavement concrete

Qin, Xiao; Lyu, Zhenghua; Shi, Liwan; Yang, Jingyu; Liu, Huifen

doi:10.1016/j.conbuildmat.2020.118714

Cited by 41 publications

(7 citation statements)

References 19 publications

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“…On this basis, according to the Karadag superabsorbent polymer absorption equation [21], the measured absorbing data of SAP were fitted, and its expression is shown in Equation (2).…”

Section: Influence Of Temperaturementioning

confidence: 99%

“…Cement concrete internal curing technology is one of the most promising technologies of shrinkage and crack resistance that can inhibit the humidity shrinkage cracks by releasing water via the internal curing agent that is incorporated into the cement paste [ 2 ]. Nowadays, superabsorbent polymers (SAP) are one of the best internal curing agents.…”

Section: Introductionmentioning

confidence: 99%

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Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste

Qin

Lin

Mao³

et al. 2023

Polymers

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The water absorption and release properties of superabsorbent polymers’ (SAP) internal curing agent are affected by many factors, such as solution properties, the ambient temperature and humidity and the particle size of SAP, which determine the curing effect and the durability of cement concrete structures directly. In this paper, the variation rule of the water absorbing capacity of SAP in simulated cement paste under different solutions and environmental conditions was studied. Based on microscopic image technology, the dynamic swelling behavior of the SAP particles was explored. The water release performance of SAP in cement paste was analyzed by both the tracer method and the negative pressure method. The results show that the water absorption of SAP in cement paste varied from 27 to 33 times. The ionic valence had a significant effect on the water absorption capacity of SAP, which suggests that the larger the ionic radius, the lower the absorption of SAP. The higher the temperature of the solution, the greater the water absorption rate of SAP. While the SAP particle size was less than 40–80 mesh, a slight ‘agglomeration effect’ was prone to occur, but the absorption state of SAP was more stable. Based on the swelling kinetic equation of SAP and the time-dependent swelling morphology of SAP in cement paste, a swelling kinetic model was established. The water release performance of SAP was less affected by the capillary negative pressures, and it would not release the water prematurely during the plastic stage, which was conducive to the continuous internal curing process of hardened paste in the later stage.

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“…On this basis, according to the Karadag superabsorbent polymer absorption equation [21], the measured absorbing data of SAP were fitted, and its expression is shown in Equation (2).…”

Section: Influence Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste

Qin

Lin

Mao³

et al. 2023

Polymers

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“…Characterization. JSM-6390A scanning electron microscope was used to characterize the micromorphology of the basalt fiber in emulsified asphalt [23][24][25] to reveal the mechanism of the basalt fiber strengthening the adhesion of the macadam seal. e amplification of SEM analysis included 100 and 1500 times.…”

Section: Microscopicmentioning

confidence: 99%

Bonding Performance and Evaluation of Basalt Fiber Asphalt Macadam Seal

Quan

Cao

2020

Advances in Civil Engineering

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To broaden the application of the basalt fiber in the preventive maintenance of asphalt pavement, this study investigated the bonding performance and evaluated the comprehensive performance of the basalt fiber asphalt macadam seal. Firstly, different types of basalt fiber asphalt macadam seal were prepared. The influences of content and length of the basalt fiber and dosage of emulsified asphalt on the bonding performance of the asphalt macadam seal were analyzed and compared. Next, by using the efficacy coefficient method, comprehensive performance considering both mechanical and economic characteristics of the basalt fiber asphalt macadam seal was evaluated. After that, reasonable content of each material was determined. Finally, the strengthening mechanism of the fiber on the bonding performance of macadam seals was revealed from a microscopic view. The results showed that compared with the ordinary asphalt macadam seal, the loss aggregate rate of the basalt fiber asphalt macadam seal was 11.0–30.5% lower, and the pull-out strength, shear strength, and torsional shear strength were 11.7–16.3%, 9.7–22.4%, and 4.2–20.6% higher, respectively. Considering the bonding performance and economic benefits, the optimal amount of emulsified asphalt and basalt fiber was 1.6 kg/m2 and 70 g/m2, respectively. Basalt fiber increased the cohesion of the asphalt material and improved the bonding performance of asphalt macadam seals through formation of the three-dimensional network structure. This study can provide reference to the application of basalt fibers in asphalt pavement maintenance.

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“…Furthermore, the internal curing effect could promote the hydration process of unhydrated minerals to produce a calcium silicate hydrate (C-S-H) gel, which enhanced the compactness of the material [ 27 , 28 , 29 ]. Qin et al [ 30 ] found that the residual pores formed by the smaller-sized SAP gels would be filled well by hydration products and the bonding strength of the interface transition zone (ITZ) between the aggregate and cement paste was enhanced.…”

Section: Introductionmentioning

confidence: 99%

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

Qin

Lin

et al. 2023

Polymers

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This paper aims at solving the material durability problem caused by spraying deicing salt on pavement concrete in the northern winter. Super absorbent polymer (SAP) was adopted as an internal curing agent to enhance the durability of pavement concrete. Curing parameters including particle size and dosage of SAP and curing condition were optimized based on mortar tests by means of the grey target decision method. The deterioration rule of durability and mechanical properties of pavement concrete internally cured by different SAP dosages after salt freeze–thaw cycles were explored through rapid freeze–thaw test. Combined with the characteristics of pore structure, hydration and microstructure, the influence mechanism of SAP on the salt freeze–thaw resistance of pavement concrete was revealed. The experimental results showed that: (i) The reduction in mass loss rate and relative dynamic modulus was significantly improved by SAP internal curing with moderate dosage; (ii) The more freeze–thaw cycles the specimen underwent, the greater the increase in strength; (iii) After 75 cycles, the chloride ion erosion depth could be decreased by approximately 23.18%. Moreover, the addition of SAP could refine the pore size, inhibit the generation of shrinkage microcracks, and promote the degree of cement hydration in the late stage, which improved the internal density of the cement concrete structure. Therefore, the deterioration of pavement under the coupling effect of salt freeze–thaw was reduced.

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Research on water transport behaviors and hydration characteristics of internal curing pavement concrete

Cited by 41 publications

References 19 publications

Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste

Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste

Bonding Performance and Evaluation of Basalt Fiber Asphalt Macadam Seal

Research on Performance Deterioration of Internally Cured Pavement Concrete under the Coupling Effect of Salt Freeze–Thaw

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