Investigation on the Failure Behavior of Engineered Cementitious Composites under Freeze-Thaw Cycles

Zhong, Junfei; Shi, Jun; Shen, Junjun; Zhou, Guangchun; Wang, Zonglin

doi:10.3390/ma12111808

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…After 50 freeze–thaw cycles, the RDME begins to decrease sharply, down to around 15% reduction at 175 freeze–thaw cycles. Qin et al [ 26 ] studied the microscopic changes of the pore structure of hardened concrete with freeze–thaw cycles. The results show that the concrete with 0.405 mm pore spacing coefficient and 2.38% air content can still withstand more than 300 freeze–thaw cycles.…”

Section: Results Analysismentioning

confidence: 99%

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

2021

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This paper aims to develop frost-resistant concretes, and investigate their pore structures and freeze–thaw damage mechanism. The frost-resistant concrete mixtures are designed by using rubber particles and nano-SiO2 to partially replace sands. The chord lengths, specific surface areas, contents and spacing coefficients of the pores in the designed concretes are measured and analyzed. The results show that concrete mixture incorporated with 5% silanized rubber and 3% nanosilica shows good synergetic effect by considering both mass loss and relative dynamic modulus of elasticity (RDME). The freeze–thaw damage degree of the concrete could be reduced by adding high elastic rubber particles, due to filling and constraining pores, and resulting in better uniform pore distribution and smaller pore spacing coefficient. Furthermore, the correlations between frost resistance and pore are analyzed and proposed.

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Section: Results Analysismentioning

confidence: 99%

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

2021

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“…In addition, some studies found that fibers have a specific effect on the durability of cement-based composites at a certain amount of fiber [ 26 , 27 , 28 ]. Nam et al [ 29 , 30 ] tested the PVA fiber within a specific dosage range to improve cement-based composites’ frost resistance.…”

Section: Introductionmentioning

confidence: 99%

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

Zou

et al. 2022

Materials

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Fibers used as reinforcement can increase the mechanical characteristics of engineering cementitious composites (ECC), but their frost resistance has received less attention. The mechanical properties of various fiber cementitious materials under the dual factors of freeze-thaw action and fiber dose are yet to be determined. This study examines the performance change patterns of cementitious composites, which contain carbon fiber, glass fiber, and polyvinyl alcohol (PVA) fiber at 0%, 0.5%, and 1% volume admixture in freeze-thaw tests. Three fiber cement-based materials are selected to do the compression and bending testing, and ABAQUS finite element modeling is used to assess the performance of fiber cement-based composite materials. The microscopic observation results show that the dispersion of glass and PVA fibers is higher than that of carbon fibers. As a result, the mechanical characteristics of the fiber-doped cementitious composites increase dramatically after freeze-thaw with increasing dosage. The compression test results show the frost resistance of carbon fiber > PVA fiber > glass fiber. In addition, the bending test results show the frost resistance of carbon fiber > glass fiber > PVA fiber. The 3D surface plots of the strength changes are established to observe the mechanical property changes under the coupling effect of admixture and freeze-thaw times. ABAQUS modeling is used to predict the strength of the cementitious composites under various admixtures and freeze-thaw cycles. The bending strength numerical equation is presented, and the bending and compressive strengths of three different fiber-cement matrix materials are accurately predicted.

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“…Afterward, the RDEM slightly reduces as the number of freeze–thaw cycles increases. This can be attributed to the expansion pressure action caused by the water freezing inside the small matrix pores, resulting in local microcrack formation [ 65 , 66 ]. It should be noted that the RDEM of the ECC was significantly unaffected by the fiber orientation.…”

Section: Resultsmentioning

confidence: 99%

Influence of Fiber Orientation on the Water and Ions Transportation of Engineered Cementitious Composite (ECC)

Tawfek

Li³

et al. 2023

Materials

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An engineered cementitious composite (ECC) belongs to a type of high-performance fiber-reinforced materials. Fiber alignment causes the anisotropy of such materials. Herein, the influence of the fiber orientation on water and ion penetration into an ECC was studied. Fiber alignment was achieved using an extrusion approach. Water absorption, sorptivity, chloride penetration resistance, sulfate attack resistance, and freezing–thawing resistance of specimens with fiber aligned horizontally (AH), vertically (AV), and randomly (R), corresponding to the direction of the exposure surface that was studied. The results showed that fibers oriented perpendicular to the water path delayed water migration into the ECC matrix. The sorptivity was significantly affected by the fiber direction. The sorptivity of the AH specimens was 35% and 13% lower than that of the AV and R specimens, respectively. After 180 days of exposure, the chloride penetration depth of the AH specimens was 5.7 mm, which is 13.6% and 20.8% lower than that of the AV and R specimens, respectively. The sulfate ingress profile indicates that the fiber–matrix interface oriented perpendicular to the penetration path can effectively delay sulfate migration. The fiber orientation also influences the compressive strength gain under immersion conditions (Na2SO4 solution, Na2SO4 + NaCl solution, and water). Compared with the AH and R specimens, the AV specimens are more sensitive to the immersion condition. In contrast, the fiber orientation has no significant effect on ECC specimens under freeze–thaw cycles. These findings indicate that controlling the fiber alignment and orientation in an ECC can improve its durability under certain exposure conditions.

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Investigation on the Failure Behavior of Engineered Cementitious Composites under Freeze-Thaw Cycles

Cited by 12 publications

References 39 publications

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

Frost Resistance and Pore Structure of Concrete Incorporated with Rubber Aggregates and Nano-SiO2

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

Influence of Fiber Orientation on the Water and Ions Transportation of Engineered Cementitious Composite (ECC)

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