Influence of supplementary cementitious materials on ITZ characteristics of recycled concrete

Gao, Song; Guo, Xin; Ban, Shunli; Ma, Yanxuan; Yu, Qi; Sui, Shiyu

doi:10.1016/j.conbuildmat.2022.129736

Cited by 25 publications

(13 citation statements)

References 36 publications

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“…This can also be explained by the reduction of pore size and refinement of crystals with the introduction of fine and reactive silica fume particles. 24 SF and FA in the concrete reduced the voids and increased the density by decreasing the size of the pores. The pozzolanic reaction of the FA and SF affects the compressive strength of the concrete by enhancing the microstructure of the binder paste and improving the bond between the paste and aggregate.…”

Section: Resultsmentioning

confidence: 95%

“…The strength increase can be attributed to the incorporation of mineral admixtures that possess pozzolanic and micro-filling properties. This can also be explained by the reduction of pore size and refinement of crystals with the introduction of fine and reactive silica fume particles . SF and FA in the concrete reduced the voids and increased the density by decreasing the size of the pores.…”

Section: Resultsmentioning

confidence: 98%

“…The pozzolanic reaction of the FA and SF affects the compressive strength of the concrete by enhancing the microstructure of the binder paste and improving the bond between the paste and aggregate. Previous works reported that the compressive strength of concrete is reduced at early stages when fly ash is used . Mineral admixtures generally have three effects on cement hydration when used with cement in concrete: first, as a filler effect to the cement, then as a pozzolanic effect, and lastly, provide additional nucleation effects during hydration.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Properties of High-Strength Self-Compacting Concrete

et al. 2023

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In this research work, the mechanical properties of high-strength self-compacting concrete (HSSCC) were studied. Three mixes were selected, having compressive strengths of more than 70, 80, and 90 MPa, respectively. For these three mixes, the stress–strain characteristics were studied by casting cylinders. It was observed during the testing that the binder content and water-to-binder ratio influence the strength of HSSCC, and slow changes in stress–strain curves were seen as the strength increased. The use of HSSCC results in reduced bond cracking, leading to a more linear and steeper stress–strain curve in the ascending branches as the strength of the concrete increases. Elastic properties such as modulus of elasticity and Poisson’s ratio of HSSCC were calculated using experimental data. In HSSCC, since the aggregate content is lower and the size of the aggregates is smaller, it will have a lower modulus of elasticity compared to normal vibrating concrete (NVC). Thus, an equation is proposed from the experimental results for predicting the modulus of elasticity of HSSCC. The results suggest that the proposed equation for predicting the elastic modulus of HSSCC for strengths ranging from 70 to 90 MPa is valid. It was also observed that the Poisson’s ratio values for all three mixes of HSSCC were found to be lower than the typical value for NVC, indicating a higher degree of stiffness.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Mechanical Properties of High-Strength Self-Compacting Concrete

et al. 2023

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“…The physical and chemical properties of each SCM can modify certain characteristics of concrete's fresh and hardened properties. However, the physical, mineralogical and chemical compositions of SCMs will be different in nature (Gao et al, 2023;Gettu et al, 2019;Ndahirwa et al, 2022). Using FA as SCMs can improve the workability of the fresh concrete, but the initial strength will be less (Megat Johari et al, 2011;Shanmugasundaram and Praveenkumar, 2021).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post-fire investigation on the mechanical properties and physical characteristics of fibre-reinforced geopolymer concrete

Prasad Burle,

Kiran,

Anand

et al. 2023

JSFE

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PurposeThe construction industries at present are focusing on designing sustainable concrete with less carbon footprint. Considering this aspect, a Fibre-Reinforced Geopolymer Concrete (FGC) was developed with 8 and 10 molarities (M). At elevated temperatures, concrete experiences deterioration of its mechanical properties which is in some cases associated with spalling, leading to the building collapse.Design/methodology/approachIn this study, six geopolymer-based mix proportions are prepared with crimped steel fibre (SF), polypropylene fibre (PF), basalt fibre (BF), a hybrid mixture consisting of (SF + PF), a hybrid mixture with (SF + BF), and a reference specimen (without fibres). After temperature exposure, ultrasonic pulse velocity, physical characteristics of damaged concrete, loss of compressive strength (CS), split tensile strength (TS), and flexural strength (FS) of concrete are assessed. A polynomial relationship is developed between residual strength properties of concrete, and it showed a good agreement.FindingsThe test results concluded that concrete with BF showed a lower loss in CS after 925 °C (i.e. 60 min of heating) temperature exposure. In the case of TS, and FS, the concrete with SF had lesser loss in strength. After 986 °C and 1029 °C exposure, concrete with the hybrid combination (SF + BF) showed lower strength deterioration in CS, TS, and FS as compared to concrete with PF and SF + PF. The rate of reduction in strength is similar to that of GC-BF in CS, GC-SF in TS and FS.Originality/valuePerformance evaluation under fire exposure is necessary for FGC. In this study, we provided the mechanical behaviour and physical properties of SF, PF, and BF-based geopolymer concrete exposed to high temperatures, which were evaluated according to ISO standards. In addition, micro-structural behaviour and linear polynomials are observed.

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