Adding limestone fines as cementitious paste replacement to lower carbon footprint of SCC

Ling, S.K.; Kwan, A.K.H.

doi:10.1016/j.conbuildmat.2016.02.072

Cited by 30 publications

(12 citation statements)

References 27 publications

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“…Moreover, as the cementitious powders are the most expensive component among the SCC raw materials, the application of SCC also limited due to its high cost per unit volume [14]. In recent years, many studies have focused on reducing the amount of cementitious materials used in fluid concrete [13,[15][16][17][18][19]. Three methods can be commonly used to reduce the cementitious binder content.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, many studies have focused on reducing the amount of cementitious materials used in fluid concrete [ 13 , 15 , 16 , 17 , 18 , 19 ]. Three methods can be commonly used to reduce the cementitious binder content.…”

Section: Introductionmentioning

confidence: 99%

“…Three methods can be commonly used to reduce the cementitious binder content. First, the replacement of the cement clinker by grounded stone powders while maintain the same workability and mechanical performances [ 17 , 20 ]. Secondly, the optimization of aggregate packing density to achieve the required workability while using less interstitial paste as the lubricant phase [ 13 , 15 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

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A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

Zhang

Zuo

et al. 2020

Materials

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The current study aims at proposing a novel and simple method for designing fluid concrete such as self-compacting concrete (SCC) with a low cementitious binder content to reduce the carbon footprint. Different testing methods regarding the packing density of aggregate mixtures are performed and compared. The W/C was determined according to the target compression strength. Slump flow spread is carried out to determine the most appropriate superplasticizer (SP) dosage and aggregate volume fractions and proportions in concrete mixtures. Furthermore, hardened performance, including compression strength and drying shrinkage of the fluid concrete, are characterized. Finally, a mix design process of fluid concrete with low cement content was proposed based on the preferred fresh and hardened properties of the concrete mixtures.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

Zhang

Zuo

et al. 2020

Materials

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“…To be consistent with industrial practice, the W/CM was expressed by weight of CM (i.e., cement + FA) and was equal to either 0.4 or 0.6. Due to the better filling effect provided by finer fillers, concrete specimens containing filler will have slightly higher compressive strength 71,[83][84][85] at moderate W/CM.…”

Section: Designmentioning

confidence: 99%

Shrinkage, cementitious paste volume, and wet packing density of concrete

Lai

Binhowimal

Griffith

et al. 2020

Structural Concrete

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Shrinkage of concrete refers to the volumetric change of concrete due to cement hydration (i.e., self-desiccation) and environmental drying (i.e., water evaporation). It creates dimensional instability and induces tensile stress when the concrete is restrained that may be large enough to cause cracking. The most fundamental way to mitigate concrete shrinkage is to decrease the shrinkage of cementitious paste in the mix design. Some major factors of concrete mix design affecting the shrinkage include water-to-cementitious material (W/CM) ratio, dosage of superplasticizer (SP), concrete strength, and cementitious paste volume (CPV). While the effects of concrete strength and CPV on shrinkage are straightforward, those of W/CM and SP are more complicated because they also affect the pore size and distribution that influence the moisture movement. In this paper, it is advocated to study the concrete shrinkage by its wet packing density (WPD). Considering that the shrinkage of concrete is associated with the moisture movement in capillary pores and that the WPD accounts for the void ratio in fresh concrete, it will be shown in this paper that the shrinkage can be correlated negatively to the WPD with the consideration of CPV. The paper thus provides a new insight to the interdependence amongst shrinkage, CPV, and WPD of concrete.

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“…FA is produced in lignite fire power plants, LFS during steel production process and LF comes as a by-product from crushing of limestone. FA and LFS can be used as SCMs and increase durability of concrete [16,17,18], while LF is successfully used in self compacted concrete as filler material [19,20]. Two sets of mixtures were produced in the laboratory, one with 500 kg/m³ and one with 830 kg/m³ total binder quantity.…”

Section: Materials and Printing Systemmentioning

confidence: 99%

Use of by-products for partial replacement of 3D printed concrete constituents; rheology, strength and shrinkage performance

Papachristoforou

Mitsopoulos

Stefanidou

2019

Frattura Ed Integrità Strutturale

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In this paper, fly ash, ladle furnace slag and limestone filler were utilized in concrete used as material for additive manufacturing (3D printing). Fly ash and ladle furnace slag were used as a replacement of cement (30% wt.) and limestone filler as a replacement of siliceous aggregates (50% wt.). Workability of fresh concretes that contained these by-products was measured 0, 15 and 30 minutes after mixing. Three different workability tests were conducted and compared: flow table, ICAR rheometer and an experimental method that measures the electric power consumption of the motor that rotates the screw extruder. Workability parameters that were measured were evaluated regarding printability of mixtures. Density, ultrasonic pulse velocity, compressive and flexural strength were measured on hardened concrete. Additionally, relative likelihood of cracking of different concrete mixtures was estimated by performing restrained shrinkage test (ASTM C1581). Results showed that use of fly ash or ladle furnace slag as binder, and limestone filler as aggregate decreases slightly the mechanical properties of concrete but improve its durability regarding cracking potential. Monitoring of electric power consumption of screw extruder motor was found to be an effective method for measuring easily real-time workability and define if a mixture is printable or not.

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Adding limestone fines as cementitious paste replacement to lower carbon footprint of SCC

Cited by 30 publications

References 27 publications

A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

A New Approach for Designing Fluid Concrete with Low Cement Content: Optimization of Packing Density of Aggregates

Shrinkage, cementitious paste volume, and wet packing density of concrete

Use of by-products for partial replacement of 3D printed concrete constituents; rheology, strength and shrinkage performance

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