Rheology, durability, and mechanical performance of sustainable self-compacting concrete with metakaolin and limestone filler

Rojo-López, Gemma; González-Fonteboa, Belén; Martínez-Abella, Fernando; González-Taboada, Iris

doi:10.1016/j.cscm.2022.e01143

Cited by 19 publications

(10 citation statements)

References 46 publications

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“…Nevertheless, sawdust small particles and wood fibers may have filled many gaps between and within them each other, thus enhancing stress transfer between both materials. This finding is in line with the previous literature of Martínez-García et al (2019), and González-Fonteboa et al (Rojo-López et al, 2022). The results also confirmed that the inclusion of FA in the mix design reduced compressive strength by around 26%, varying with the content of FA.…”

Section: Resultssupporting

confidence: 94%

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Nikoo

Hafeez

Faridmehr

et al. 2023

Advances in Structural Engineering

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Geopolymer concrete has developed as a potential alternative to ordinary Portland cement-based concrete, wherein various industrial by-products have been converted as beneficial spin-offs. Apart from appropriate compressive strength in the construction sector worldwide, the durability, sound absorption, thermal conductivity, and weight of concrete are also major concerns. Lightweight geopolymer concretes have gained attention because of their superior strength, durability, lower environmental impact, and sustainable characteristics. In this view, the current study examined the feasibility of using sawdust as a natural fine and coarse aggregate substitution in fly ash (FA)-granulated blast furnace slag (GBFS) based geopolymer concrete. Four mixes with a different percentage of sawdust (25, 50, 75, and 100) substituting natural aggregate were designed to examine the effects of sawdust on fresh and hardened features of geopolymer concrete compared to those conventional FA-GBFS-based geopolymer concrete with natural aggregate. Sodium silicate (NS) and sodium hydroxide (NH) (with NS/NH ratio of 0.75) were utilized to dissolve the alumina silicate from FA and GBFS. Informational models were developed using an experimental dataset to estimate the compressive strength of geopolymer concrete mix designs. Besides, using the weight of the developed network, a global sensitivity (GS) analysis was developed to identify the sensitivity of compressive strength to the waste sawdust content. Test results confirmed that by substituting natural aggregate with 100% sawdust, there was around a 35% decrease in compressive strength. Nevertheless, the sound absorption coefficient was increased by an average of 38% in frequencies range between 1800 and 2500 HZ, and thermal conductivity decreased by around 4.5 times once the natural aggregate was substituted by 100% sawdust.

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Section: Resultssupporting

confidence: 94%

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Nikoo

Hafeez

Faridmehr

et al. 2023

Advances in Structural Engineering

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“…SF particles appear less smooth and more porous than LF particles. A very similar result was obtained by Rojo-López et al [ 58 ] for a similar LF. No SEM images of ATS particles have been found with a procedure similar to the one used in this study.…”

Section: Resultssupporting

confidence: 90%

The Effect of Acanthocardia tuberculata Shell Powder as Filler on the Performance of Self-Compacting Mortar

et al. 2023

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In this research, the feasibility of using Acanthocardia tuberculata shell waste from the canning industry in the manufacturing of self-compacting mortar (SCM) was tested. The seashells were finely ground to be used as filler instead of the limestone filler normally used in this type of SCM. First, a physicochemical and microstructural characterisation of all raw materials was carried out, including the particle size distribution of both fillers. Subsequently, the self-compactability properties in the fresh state of SCM were evaluated using a total substitution by volume of limestone filler for seashell powder, using different self-compactiblity parameters. The mineralogical phases of all the SCM tested were identified once hardened by means of X-ray diffraction technique, thermogravimetric and differential thermal analysis. In addition, the mechanical properties, water absorption capacity, dry bulk density and accessible porosity of water of hardened mortars at 28 days of curing were analysed. The effect of replacing limestone filler by Acanthocardia tuberculata filler resulted in a decrease in compressive strength of 29.43, 16.84 and 2.29%, respectively. The results indicate that it is possible to completely replace natural limestone filler with Acanthocardia tuberculata shell filler without significantly affecting the mechanical properties of SCM.

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“…Incorporating 20% USL and 10% LS in the cement, the USL filled the particle space, released the trapped water, and incremented the free water content. The large LS particle extended the skeleton space of the paste, the cement particles filled the particle space of the skeleton space of the LS, and the USL particles filled the space between the cement particles, leading to a decrease in the shear thickening and the yield stress [ 32 , 33 ]. Increasing the USL content increased the adsorption of the water reducing agent and its agglomeration effect, which maintained the positive impact imposed by the increase in free water and influenced the degree of shear thickening [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

et al. 2023

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This study investigated the effect of the interaction between ultrafine slag powder (USL) and limestone (LS) on the rheology behavior, microstructure, and fractal features of UHPC. The results indicated that B2 with mass ratio of 2:1 between the USL and LS obtained the highest compressive strength and the lowest yield stress. The combination of the USL and LS facilitated the cement hydration, ettringite, and monocarboaluminate (Mc) formation, as well as the increase in the polymerization of the C–S–H. The synergistic action between the USL and LS refined the pore structure due to the formation of the Mc, compensating for the consumption of the CH by the pozzolanic reaction, which provided a denser microstructure in the UHPC. The fractal dimension (Ds) of the UHPC was strongly related to the concrete pore structures and the compressive strength, which demonstrated that a new metric called the Ds value may be used to assess the synergistic effect of the UHPC.

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Rheology, durability, and mechanical performance of sustainable self-compacting concrete with metakaolin and limestone filler

Cited by 19 publications

References 46 publications

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

The Effect of Acanthocardia tuberculata Shell Powder as Filler on the Performance of Self-Compacting Mortar

The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

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