PCM-Concrete Interfacial Tensile Behavior Using Nano-SiO&lt;sub&gt;2&lt;/sub&gt; Based on Splitting-Tensile Test

Li, Kan; Wei, Zhiqiang; Qiaou, Hongxia; Lu, Chenggong; Hakuzweyezu, Theogene

doi:10.3151/jact.19.321

Cited by 7 publications

(2 citation statements)

References 32 publications

(29 reference statements)

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“…Significant criteria were imposed considering the F-value to evaluate the durability enhancement effect of silica fume PCM as a repair mortar under the influence of influencing factors (elevated temperature and moisture content) on the interface of both normal and modified PCM specimens. The details of the calculation process/formulas of the parameters of the ANOVA table, as shown in Table 4, are presented in the literature [80]. Note: "r" refers to levers number of influencing factor, and "n" refers to the total outcomes of different levers for influencing factor.…”

Section: Discussionmentioning

confidence: 99%

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

Mizan

Matsumoto

2023

Polymers

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The long-term performance of the concrete–polymer cement mortar (PCM) interface under environmental exposure is crucial to the safety of the PCM overlaying method as the environmental exposure of the repaired structures caused further degradation of the interface, leading to a significant reduction in intended service life. This study investigates the durability enhancement effect of silica fume of the concrete–PCM interface, considering an individual action of elevated temperature (e.g., 60 °C) [constant (short and moderate duration) and cyclic conditions] and moisture content [continuous immersion and wetting/drying (W/D) cycle]. Our previous research confirmed that the use of silica fume forms more C-S-H with strong binding force and enhances the interfacial bonding strength due to the denser microstructure at the interface, and it is expected to be utilized for durability purposes under the aforementioned exposure conditions. Under all elevated temperature exposure conditions, the reduction percentage of the interfacial performance corresponding to the respective reference specimens reduced significantly with the inclusion of silica fume with overlay material. The occurrence of interface fracture at lower load and a greater number of pure interface fracture modes observed in normal PCM specimens compared to modified PCM specimens indicates a positive influence of higher adhesion with better durability of modified PCM overlay with substrate concrete. Under both conditions of moisture content, significant reduction in interfacial strength was observed in normal PCM specimens. In all cases, the reducing ratio of interfacial strength was higher in normal PCM compared to modified PCM, indicating a positive influence of silica fume under moisture content. Furthermore, silica fume inclusion shifts the fracture mode from pure interfacial fracture to composite fracture mode, indicating a positive response of silica fume to improve the resistance of interface fracture under moisture content. Conclusively, the use of silica fume improves concrete–overlay layer adhesion and enhances the bonding durability under environmental exposure.

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Section: Discussionmentioning

confidence: 99%

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

Mizan

Matsumoto

2023

Polymers

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“…The above results have shown that the A, S, and W/B were the critical factors affecting the mechanical properties of the CGBGM. In order to evaluate the level of significance for each factor, a one-way analysis of variance (ANOVA) method was employed, which is the variance model of only one dependent variable [36]. Based on the ANOVA method, the value of F can reflect the influence of each factor on the various performances of the CGBGM, and significant analyses are displayed in Table 3.…”

Section: One-way Analysis Of Variance (Anova)mentioning

confidence: 99%

Design and Properties of Coal Gangue-Based Geopolymer Mortar

et al. 2022

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The feasibility of preparing coal gangue-based geopolymer mortar (CGBGM) with composite-activated coal gangue was experimentally explored in this paper. The effects of water-to-binder ratio (W/B), alkali content (A), and slag content (S) on the fluidity and performances of the CGBGM were experimentally investigated. The ANOVA method was employed to evaluate the significance level of influenced factors. Moreover, the microstructure, element compositions, and qualitative microanalysis of the CGBGM at various curing ages were verified by ESEM-EDS. Test results denoted that the mechanical properties of the CGBGM are superior to that of ordinary Portland cement mortar (OPCM). The flexural and compressive strength of the CGBGM rapidly increases before 7 d and then tends to slow afterward. According to the impact degree on the flexural and compressive strength of the CGBGM, the S is ranked first, followed by the A, and finally the W/B. The flexural and compressive strength of specimens with 40% slag increased by 45.97% and 90.75%, respectively, compared to the control group. However, the A and W/B have little effect on flexural strength. In addition, the hydration productions filled in the crevice and healed the entrapped microcracks in the hardened paste with the increase in curing ages, forming a dense microstructure. The Ca/Si decreased from 0.5 at 3 d to 0.06 at 28 d, and the Ca/Al decreased from 0.25 at 3 d to 0.05 at 28 d. Finally, the difference in drying shrinkage behavior between the CGBGM and OPCM was systematically analyzed.

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Polymer cement mortar strengthened RC beams with/without silica fume as repair material

Hasan Mizan,

Matsumoto

2023

Construction and Building Materials

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PCM-Concrete Interfacial Tensile Behavior Using Nano-SiO<sub>2</sub> Based on Splitting-Tensile Test

Cited by 7 publications

References 32 publications

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

Design and Properties of Coal Gangue-Based Geopolymer Mortar

Polymer cement mortar strengthened RC beams with/without silica fume as repair material

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