Influence of nanoclays on flowability and rheology of SCC pastes

Varela, Hugo; Barluenga, Gonzalo; Palomar, Irene

doi:10.1016/j.conbuildmat.2020.118285

Cited by 34 publications

(9 citation statements)

References 36 publications

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“…ratio. Following this context, Varela et al (2020) [121] experimentally studied the influence of four types of nano-clays on rheology of SCC pastes, including attapulgite, bentonite, one sepiolite powder form, and one sepiolite dispersed in water. Generally, they reported that all nano-clays have higher yield stress as compared to the reference mixture.…”

Section: Effect Of Clays On Viscosity Of Concretementioning

confidence: 99%

“…Generally, they reported that all nano-clays have higher yield stress as compared to the reference mixture. Moreover, among them, nano sepiolites have the highest yield stress [121]. They showed that nano bentonite-contained SCC pastes have 20.5% and 175.5% higher yield stress, as compared to the reference SCC paste, for w/c ratios of 0.35 and 0.45, respectively.…”

Section: Effect Of Clays On Viscosity Of Concretementioning

confidence: 99%

See 1 more Smart Citation

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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The negative environmental impacts of Portland cement as a binder in the construction industry have created a growing impetus to develop sustainable alternative binders. Various types of clay have been considered as potential cement replacements. The impact of clays as cement replacement depends on the dosage and treatment methods. This paper presents a comprehensive review to determine the effects of different types of clay on the fresh and hardened properties of concrete mixtures by analyzing the experimental database reported by the literature, including raw, calcined, modified, nano, and organo. This study intends to show the process of optimizing the use of clay in concrete, the reason behind converting raw clay to modified types, and research gaps through a comparison study between different types of clays. The present review study shows that clay-based concrete mixtures have higher thixotropy and yield stress values, improving shape stability. This results in lower early-age shrinkage of the concrete. However, the high floc strength of clay-based concrete causes a reduction in flowability. Treatment methods of raw clay, such as calcination and nano-sized clay particles, improve concrete compressive strength. General results of the previous studies highlight that all types of clay investigated positively affect the resistance of concrete to environmental attack.

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Section: Effect Of Clays On Viscosity Of Concretementioning

confidence: 99%

Section: Effect Of Clays On Viscosity Of Concretementioning

confidence: 99%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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show abstract

“…It is considered that the combinations of GG increased the plastic viscosity of concrete more than with the combinations of ST, because the cohesion of GG is stronger than that of ST in cement paste. In summary, adding VMA shows a higher plastic viscosity when compared to plain samples [39][40][41][42]. The plastic viscosity and yield stress show a proportional relationship regardless of the combinations of VMA and the elapsed time.…”

Section: Rheological Performancementioning

confidence: 99%

Evaluations of All-in-One, Polycarboxylate-Based Superplasticizer with Viscosity Modifying Agents for the Application of Normal-Strength, High-Fluidity Concrete

Kong¹,

Yang

Lee

et al. 2021

Applied Sciences

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High fluidity concrete exhibits an excellent self-compacting property. However, the application of typical high-fluidity concrete is limited in the normal strength range (18~35 MPa) due to the large amount of binder. Therefore, it is important to solve these problems by adding a viscosity modifying agent (VMA) with a superplasticizer (PCE), which helps to improve the fluidity of the concrete. In addition, the rheology and stability of the concrete with VMA can be improved by preventing bleeding and segregation issues. Current studies focused on the physical phenomena of concrete such as the fluidity, rheological properties, and compressive strength of normal-strength, high-fluidity concrete (NSHFC) with different types of a polycarboxylate-based superplasticizer (NPCE). The obtained results suggested that the combinations of all-in-one polycarboxylate-based superplasticizers (NPCE) did not cause any cohesion or sedimentation even stored for a long time. The combination of three types of VMA showed the best fluidity (initial slump flow of 595~630 mm) without any segregation and bleeding, and the compressive strength at 28 days was also found to be the highest: 34–37 MPa. From these results, the combination of PCE (2.0%) + HPMC (0.3%) + WG (0.1%) + ST (0.1%) showed an 18% higher plastic viscosity and -4.4% lower yield stress than Plain.

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“…In China, clay minerals are abundant resources and are easily obtainable at a low cost. NMK, NMA, nano-montmorillonite, and other nanomaterials make up the majority of these clay minerals [11]. These have been found to improve the mechanical properties [12,13] and shrinkage cracking behavior [14,15] of modified cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Study on Shrinkage Cracking Morphology of Cement Mortar with Different Nanoclay Particles under Restraint

et al. 2022

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In this paper,different types and particle sizes of nanoclay(nano-metakaolin—NMK—and nano-attapulgite—NMA—clay) were selected to study the effect of nanoclay on the properties of cement-based cementitious materials. The stability of different nanoclay dispersions wasanalyzed. The effects of nanoclay on the mechanical properties and cracking behavior of cement mortar were discussed. The crack propagation behavior of nanoclay cement mortar was analyzed by flatknife-edge induced constraint and ring constraintexperiments. The research shows that the degree of aggregation of NMA particles is lower than that of NMK. The larger the particle size of NMA, the lower the degree of particle aggregation. The larger the particle size of NMK, the lower the degree of particle aggregation in water.NMK has the best improvement effect on cement mortar. The smaller the particle size, the more pronounced the improvement effect. The flexural strength ratio, compressive strength ratio, and elastic modulus ratio of 7d and 28d are 76.7%, 67.4%, and 61.2%, respectively. In the flat plate cracking experiment, the maximum crack width of NMK-3 and NMA-2 was reduced by 33.3% and 25.0%, respectively, compared withordinary cement mortar. The maximum crack length was reduced by 55.1% and 33.1% compared with cement mortar. In the ring constraintexperiment, the total cracked area of NMK-1, NMA-1, NMK-3, and NMA-2 rings increased by 64.3%, 45.0%, 92.7%, and 49.7%, respectively, compared with ordinary cement mortar rings after 60 days. NMK can advance the cracking time of cement mortar, but it can inhibit the generation and development of cracks and refine the crack width.

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Influence of nanoclays on flowability and rheology of SCC pastes

Cited by 34 publications

References 36 publications

Clay as a Sustainable Binder for Concrete—A Review

Clay as a Sustainable Binder for Concrete—A Review

Evaluations of All-in-One, Polycarboxylate-Based Superplasticizer with Viscosity Modifying Agents for the Application of Normal-Strength, High-Fluidity Concrete

Study on Shrinkage Cracking Morphology of Cement Mortar with Different Nanoclay Particles under Restraint

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