Optimum recycled concrete aggregate and micro-silica content in self-compacting concrete: Rheological, mechanical and microstructural properties

Bahrami, Nasrollah; Zohrabi, Mehdi; Mahmoudy, Seyed Ali; Akbari, Mahmood

doi:10.1016/j.jobe.2020.101361

Cited by 47 publications

(21 citation statements)

References 45 publications

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“…Other researchers also agree that the addition of MS of 10% by wtob or more will lead to reduced workability of the mix. They also agree that the optimal dosage of MS is within the range of 5-10% by wtob [5]. Compressive strength tests showed that there is a significant improvement in the early age strength at 2 days when increasing the substitution rate of MS from 1.25% to 2.5% by wtob.…”

Section: Fig 4 Slump Flow Of Uhpc Mixes With Differing Ms Dosage Over Timesupporting

confidence: 62%

Compressive strength and rheology dependency on micro silica dosage in ultra-high-performance concrete

Ozolins

Zavickis²,

Lukašenoks

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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Ultra-high-performance concrete (UHPC) is a new and innovative concrete material associated with very high strength, low permeability to aggressive environment and self-compact ability. These characteristics enable innovative engineering solutions to be applied in practice which would have previously been thought to be impossible to manufacture. Many previous studies suggest relatively high dosage rates of micro silica (MS) (25% by weight of binder (wtob)). This paper focuses on optimizing and studying how the MS addition to UHPC affects the compressive strength and overall rheological properties of UHPC. The study was performed by doing compressive strength tests as well as concrete slump flow tests to evaluate the rheology and slump flow over a period of time to evaluate how well the mix retains its initial rheological properties. It was found that the compressive strength was enhanced the most by 3.75% by wtob of MS substitution. The best rheology for selfcompact ability was obtained by substituting MS between 5% and 7.5% by wtob. It was also found that increase an in MS dosage rate will reduce the open life of fresh concrete.

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Section: Fig 4 Slump Flow Of Uhpc Mixes With Differing Ms Dosage Over Timesupporting

confidence: 62%

Compressive strength and rheology dependency on micro silica dosage in ultra-high-performance concrete

Ozolins

Zavickis²,

Lukašenoks

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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“…The workability of fresh concrete is often utilized as an index to evaluate its pumpability in engineering. The parameters commonly used to represent the workability of concrete are mainly the slump flow and V-Funnel flow time [ 47 , 48 ]. It is widely accepted that the slump flow and V-Funnel flow time have good correlations with the yield stress and viscosity of bulk concrete, respectively.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Different Measurement Methods for Characterizing Rheological Properties of Lubrication Layer

2021

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The lubrication layer plays a governing role in predicting the pumpability of fresh concrete. To determine the effect of measurement methods on the characterization of the rheological properties of the lubrication layer, different measurement systems, including Sliper, tribometer, and the utilization of a mortar rheometer, were employed. The rheological properties and workability of bulk concrete were measured in parallel to investigate the correlation between them and the rheological properties of the lubrication layer. The results show that the measured values of the rheological parameters of the lubrication layer differ due to the systematic deviation between different measurement methods. The results obtained by both tribometer and mortar rheometer were well-correlated, having a linear relationship with the rheological parameters of bulk concrete. The correlation coefficient between results gained with Sliper and rheological parameters of concrete or lubrication layer determined with other methods was not high enough. Addition friction led to the large accidental error and overestimated yield stress obtained with Sliper. The workability of concrete is only suitable for characterizing the rheological properties of bulk concrete.

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“…An increase in TA/C and FA/CA ratio is observed for family V, when compared to all other families. Bahrami et al, 2020 [12], Sun et al, 2020 [68] and Surendar et al, 2021 [69] used a constant TA/C ratio, FA/CA ratio and W/S ratio in percentage and reported a slight variation in strength requirement for minimum modification in aggregates. Several authors tried 100% replacement for natural aggregate and achieved the minimum requirement of strength.…”

Section: Design Parameters From Literaturementioning

confidence: 99%

“…This material possesses different characteristics than traditional concrete, for example, in terms of strength. The idea of this material was first introduced in 1992 by Okamura [11] and has gained space over time in the construction industry [10,12], due to the ease of placement in hard-to-reach areas with less effort and time [13] The advantages of this type of material include technological, social and economic advantages; however, its cost is 2 to 3 times higher than that of conventional concrete due to the high demand for cementation materials and chemical admixtures (super plasticizers or water reducers).…”

Section: Introductionmentioning

confidence: 99%

Impact of Design Parameters on the Ratio of Compressive to Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate

Martínez‐García

Jagadesh²,

Búrdalo

et al. 2021

Materials

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Most concrete studies are concentrated on mechanical properties especially strength properties either directly or indirectly (fresh and durability properties). Hence, the ratio of split tensile strength to compressive strength plays a vital role in defining the concrete properties. In this review, the impact of design parameters on the strength ratio of various grades of Self-Compacting Concrete (SCC) with recycled aggregate is assessed. The design parameters considered for the study are Water to Cement (W/C) ratio, Water to Binder (W/B) ratio, Total Aggregates to Cement (TA/C) ratio, Fine Aggregate to Coarse Aggregate (FA/CA) ratio, Water to Solid (W/S) ratio in percentage, superplasticizer (SP) content (kg/cu.m), replacement percentage of recycled coarse aggregates (RCA), replacement percentage of recycled fine aggregates (RFA), fresh density and loading area of the specimen. It is observed that the strength ratio of SCC with recycled aggregates is affected by design parameters.

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Optimum recycled concrete aggregate and micro-silica content in self-compacting concrete: Rheological, mechanical and microstructural properties

Cited by 47 publications

References 45 publications

Compressive strength and rheology dependency on micro silica dosage in ultra-high-performance concrete

Compressive strength and rheology dependency on micro silica dosage in ultra-high-performance concrete

Comparative Study of Different Measurement Methods for Characterizing Rheological Properties of Lubrication Layer

Impact of Design Parameters on the Ratio of Compressive to Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate

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