Coupled effects of limestone powder and high-volume fly ash on mechanical properties of ECC

Türk, Kâzım; Nehdi, Moncef L.

doi:10.1016/j.conbuildmat.2017.12.186

Cited by 54 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The compressive and flexural strength of the mortar is shown in Figure 1 . For the early-age strength of all samples, before 28 days, compressive strength and flexural strength, when increasing limestone powder content, showed a trend of first increasing and then decreasing, which is consistent with previous studies from other composite cementitious materials mixed with limestone powder [ 31 , 32 ]. For the final strength of all samples, both compressive strength and flexural strength varied little when the substitution content of limestone powder was lower.…”

Section: Materials and Experimentssupporting

confidence: 91%

Investigation on Hydration and Mechanical Properties of Mortar Containing Limestone Powder and Fly Ash Based on the Coupled Chemical–Thermal–Mechanical Method

Zhou

Tian

et al. 2020

Materials

View full text Add to dashboard Cite

The composited cementitious materials usually have superior performance; for example, using limestone powder (LP) and fly ash (FA) as the admixtures of cement in concrete/mortar is a popular way of improving the properties of concrete/mortar structures. In this work, we performed experimental tests to study the hydration process and pore distribution in mortar containing different ratios of LP and FA. Based on the results of mercury intrusion porosimetry (MIP), a numerical mortar model with random pore is built. The model can reflect the synergistic hydration interaction and filling effect caused by the admixtures of LP and FA. After analyzing the hydration process, the coupled chemical–thermal–mechanical method was used to simulate the characteristics of mortar containing LP and FA. The coupling model can simulate the “hump-type” hydration acceleration stage of the mortar at early age, which is specifically caused by the LP, proved in the experimental test. Additionally, the special, “hump-type” stage is important to enhance the early strength of the mortar. At different levels of admixture content, the random pore model and coupled method can predict the evolution process of the mechanical properties well, at early age and for long-term strength. Both experimental and numerical results suggest that the mortar containing admixtures of the proper ratio of LP to FA have good mechanical properties, which can be applied to engineering structures.

show abstract

Section: Materials and Experimentssupporting

confidence: 91%

Investigation on Hydration and Mechanical Properties of Mortar Containing Limestone Powder and Fly Ash Based on the Coupled Chemical–Thermal–Mechanical Method

Zhou

Tian

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…The addition of RP increased the density of RP F -ECC-100% and RP S -ECC-100% presented in Figure 13 (b),(c), which could be considered to benefit from the filling effect of RP. 28,29…”

Section: Resultsmentioning

confidence: 99%

Deformability enhancement of fiber-reinforced cementitious composite by incorporating recycled powder

Jiang

et al. 2019

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Recycled powder (RP) from construction and demolish waste was used to replace fly ash and silica sand to enhance the tensile behavior of engineered cementitious composite (ECC) in the research. The average diameter of RP is less than 45 μm. Four mixtures of RP-ECCs were prepared, in which 50% and 100% of fly ash or silica sand were replaced by RP. The tensile strain-hardening and multiple cracking behaviors of RP-ECC specimens were extensively observed with the increasing tensile load. Results demonstrate that the replacement of fly ash and sand by RP promote the strain capacity of ECC specimens. Moreover, specimens with 50% RP showed superior tensile and compressive strength over those with 100% replacement ratio and the reference specimens. The analyses at micro-scale and meso-scale indicate that the replacement of fly ash by RP does not change the fracture toughness of the cementitious matrix, but significantly enhanced the fiber bridging capacity. While the replacement of sand by RP lowers the matrix fracture toughness and has a negligible effect on the fiber bridging capacity. Finally, the superior tensile strain capacity of RP-ECC is well-explained by the pseudo-strain hardening index.

show abstract

“…But for long-term age, incorporation of finer limestone powder may decrease the compressive strength [ 1 ], because the dilution effect of finer limestone powder may be more effective than its filler effect or nucleation effect at the end stage of the hydration process. With the increased content, compressive strength and flexural strength decrease [ 1 , 47 , 54 , 55 , 58 ]. On one hand, a high replacement content reduces the amount of cement and this is not good for the strength development because limestone powder has no cementitious ability.…”

Section: Micro-calcium Carbonatementioning

confidence: 99%

“…On the other hand, the dilution effect is more effective with the increase in substitution content, and causes a high effective water to cement ratio and lower strength. However, flexural defection of polyvinyl alcohol fiber reinforced engineered cementitious composites (PVA-ECC) may be improved after the addition of limestone powder because of uniform dispersion of PVA fiber caused by the diluting effect of limestone powder [ 58 ].…”

Section: Micro-calcium Carbonatementioning

confidence: 99%

“…However, when a large amount of cement is replaced by nano-calcium carbonate, the dilution effect is more effective, just like the micro-calcium carbonate. Moreover, agglomeration of nano-calcium carbonate will seriously reduce the development of compression, which is different to micro-calcium carbonate [ 1 , 54 , 55 , 58 ]. In addition, the denser matrix caused by the addition of nano-calcium carbonate could not provide available space for the formation of hydration products [ 77 ].…”

Section: Nano-calcium Carbonatementioning

confidence: 99%

See 1 more Smart Citation

Effect of Macro-, Micro- and Nano-Calcium Carbonate on Properties of Cementitious Composites—A Review

et al. 2019

View full text Add to dashboard Cite

Calcium carbonate is wildly used in cementitious composites at different scales and can affect the properties of cementitious composites through physical effects (such as the filler effect, dilution effect and nucleation effect) and chemical effects. The effects of macro (>1 mm)-, micro (1 μm–1 mm)- and nano (<1 μm)-sizes of calcium carbonate on the hydration process, workability, mechanical properties and durability are reviewed. Macro-calcium carbonate mainly acts as an inert filler and can be involved in building the skeletons of hardened cementitious composites to provide part of the strength. Micro-calcium carbonate not only fills the voids between cement grains, but also accelerates the hydration process and affects the workability, mechanical properties and durability through the dilution, nucleation and even chemical effects. Nano-calcium carbonate also has both physical and chemical effects on the properties of cementitious composites, and these effects behave even more effectively than those of micro-calcium carbonate. However, agglomeration of nano-calcium carbonate reduces its enhancement effects remarkably.

show abstract

Coupled effects of limestone powder and high-volume fly ash on mechanical properties of ECC

Cited by 54 publications

References 24 publications

Investigation on Hydration and Mechanical Properties of Mortar Containing Limestone Powder and Fly Ash Based on the Coupled Chemical–Thermal–Mechanical Method

Investigation on Hydration and Mechanical Properties of Mortar Containing Limestone Powder and Fly Ash Based on the Coupled Chemical–Thermal–Mechanical Method

Deformability enhancement of fiber-reinforced cementitious composite by incorporating recycled powder

Effect of Macro-, Micro- and Nano-Calcium Carbonate on Properties of Cementitious Composites—A Review

Contact Info

Product

Resources

About