Mitigation of the Factors Affecting the Autogenous Shrinkage of Ultra-High Performance Concrete

Jabbar, Adil M.; Hamood, Mohammed J.; Mohammed, Dhiyaa H.

doi:10.30684/etj.v39i12.2155

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Other studies stated that the best percentage of silica fume to use in HSC and UHPC mixes ranges between (15-30) % of cement weight relying on the other ingredients [4], [6], [16], [17], [19], [27], [33], [34], [35].…”

Section: Silica Fumementioning

confidence: 99%

Using Cementitious Materials to Enhance Concrete Properties and Improve the Environment: A Review

Jabbar

2023

ejuow

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Cement production significantly contributes to carbon dioxide emissions, which increase global warming. Therefore, reducing cement consumption can support efforts to reduce that risk. On the other hand, the consumption of industrial wastes in concrete production contributes to improving the environment. Industrial waste can be used as supplementary cementitious materials (SCMs) to enhance concrete properties. This paper reviews the effects of SCMs, such as silica fume, fly ash, metakaolin, and ground granulated blast furnace slag (GGBFS), on the properties of fresh and hardened concrete. The findings show that SCMs enhance packing density and reduce permeability. The impact of SCMs on concrete properties appears after a period of curing depending on the availability of calcium hydroxide and activity index. Calcium hydroxide produced from cement hydration reacts with silicates of SCMs to produce additional calcium-silicate hydrates that enhance concrete strength and minimize the relatively large size of calcium hydroxide, which lowers porosity. Silica fume and metakaolin raise water demands and reduce workability, while GGBFS and fly ash improve workability. Silica fume, metakaolin, and (10) μm particle size of GGBFS increase early-age strength, (10-45) μm particle size of GGBFS enhances strength after 28 days, while fly ash raises the strength after 90 days. For low cement content, 10 % or less silica fume, (10-30) % fly ash, (10-20) % GGBFS or metakaolin are considered the perfect percentage to arrive at best strength. For high cement content, (25-30) % silica fume or 40 % fly ash is considered the optimum ratio to reach the highest strength.

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Section: Silica Fumementioning

confidence: 99%

Using Cementitious Materials to Enhance Concrete Properties and Improve the Environment: A Review

Jabbar

2023

ejuow

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“…Incorporating basalt fibers into concrete reduced drying shrinkage and contributed to 1 www.galencomposite.ru minimizing the voids in size and quantity [20]. On the other hand, incorporating basalt fibers with the concrete matrix can enhance the absorbed energy and ductility [21]. Also, the numerous basalt filaments for any volume fraction and their orientation in different directions contribute to disrupting cracks in the concrete and impeding their progress, which highly improves the strength [15,21].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, incorporating basalt fibers with the concrete matrix can enhance the absorbed energy and ductility [21]. Also, the numerous basalt filaments for any volume fraction and their orientation in different directions contribute to disrupting cracks in the concrete and impeding their progress, which highly improves the strength [15,21]. Therefore, basalt fibers act to confine concrete internally.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Impact of Basalt Fibers and Tie Spacing on Short Concrete Column Behavior

Hassan

Jabbar

Mohammed

2023

IJE

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This paper demonstrates the effect of adding basalt fibers into a concrete matrix and altering tie spacing on the behavior of short concrete columns since short columns are more robust than long ones and are primarily used in structures. Also, the impact of changing the reinforcement ratio on column behavior is numerically discovered. Three volume fractions of basalt fiber and three-tie spacing are adopted. The results illustrate that no-fiber columns sustain more than 50 % of the failure load before cracking, while this percentage raised to 75 % upon adding basalt fiber to concrete. 0.3 % of basalt fiber increases the compressive strength, cracking and ultimate column loads better than 0.6 %. Likewise, the impact of basalt fiber on the crack load is more pronounced than on the maximum load of the column. Basalt fiber columns exhibit lower longitudinal displacement than no-fiber ones at the cracking state. The shortening increases with increasing tie spacing, whereas decreasing tie spacing barely increases the ultimate load of the column. The numerical analysis provides close results to the experimental ones and shows that increasing the reinforcement ratio raises the column's load capacity. For the same tie spacing, increasing the reinforcement ratio raises the loading capacity of columns, and the longitudinal displacement barely increases upon increasing spacing. Generally, basalt fibers delay cracking and improve the column loading capacity.

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Ultra-high performance concrete: Mix design, raw materials and curing regimes-A review

Wang

Zhu

et al. 2023

Materials Today Communications

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Mitigation of the Factors Affecting the Autogenous Shrinkage of Ultra-High Performance Concrete

Cited by 3 publications

References 11 publications

Using Cementitious Materials to Enhance Concrete Properties and Improve the Environment: A Review

Using Cementitious Materials to Enhance Concrete Properties and Improve the Environment: A Review

Experimental and Numerical Investigation of the Impact of Basalt Fibers and Tie Spacing on Short Concrete Column Behavior

Ultra-high performance concrete: Mix design, raw materials and curing regimes-A review

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