Study of the Rheological Behavior of Mortar with Silica Fume and Superplasticizer Admixtures According to the Water Film Thickness

Adjoudj, M’hamed; Ezziane, Karim; Kadri, El-Hadj; Soualhi, Hamza

doi:10.1007/s12205-017-0228-3

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…The yield stress values plotted in Figs. 21 and 22, which vary from 6 to 13 Pa for SC-CEM mixes made in this study, are congruent with other results (Adjoudj et al 2018) in which the yield stress results of mortars change between 8 and 12 Pa. Table 7 also shows the results of the yield stress calculated for the SC-CEM mixes in keeping with Eq. 3.…”

Section: Rheological Parameter Estimationsupporting

confidence: 91%

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Amara

Arabi

Perrot

2021

Environ Sci Pollut Res

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The self-compacting concrete (SCC) mix design is much more complex than that of ordinary concrete. Increased testing on fresh concrete and a substantial volume of materials is consequently needed. The concrete equivalent mortar (CEM) method proposes an approach that simplifies and speeds up the experimental testing programmes. This paper seeks to establish the relationships between the rheological properties of SCC and the corresponding CEM mixes. Another aim is to validate the unconventional tools used to test the flow properties of CEM relative to the procedures applied for SCC. Different series of SCC and CEM mixes, based on natural and recycled aggregates, with various superplasticizer contents were tested. The flow behaviour of SCC was tested in line with procedures recommended by EFNARC; that of self-compacting concrete equivalent mortar (SC-CEM) was carried out with unconventional tools (mini-slump cone, slump flow time T 250 , mini L-Box, 2.5-mm sieve, and mini LCPC Box), described in detail in this paper. A rheometer equipped with vane geometry was also used to show the close relationship between SCC and the SC-CEM yield stress. The experimental results indicate that the fresh properties of the mixture series are congruent with the acceptance criteria of SCC, but they are affected when increasing the superplasticizer dosage and further impacted when recycled coarse aggregates (RCAs) replace natural coarse aggregates (NCAs). The slump flow test appears to be a good practical means for predicting the yield stress of SC-CEM. The cross-referencing results reveal significant relationships between SCC and the corresponding SC-CEM, particularly for filling ability and passing properties. Reasonable correlation coefficients from 0.70 to 0.85 were found.Keywords Recycled concrete aggregates • Concrete equivalent mortar • Self-compacting concrete • Fresh properties

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Section: Rheological Parameter Estimationsupporting

confidence: 91%

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Amara

Arabi

Perrot

2021

Environ Sci Pollut Res

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“…Previous studies showed that the material packing density will be higher with a wider range of material particle sizes [26]. The PCE can disperse cement particles and thus increase the packing density of cement paste [27], leading to an increase in the WFT [28,29] and further improving the flow spread of the paste. However, if the PCE dosage is too high, it will cause the cement paste to bleed and affect other properties such as cohesiveness and strength.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sand-Cement Ratio and Polycarboxylate Superplasticizer on the Basic Properties of Mortar Based on Water Film Thickness

et al. 2021

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Previous studies demonstrated that water film thickness (WFT) is a key factor that affects the fluidity of mortar. Changes in the sand-cement (S/C) ratio and polycarboxylate superplasticizer (PCE) dosage will affect the WFT. In this study, several mortar samples with different S/C ratios and different PCE dosages were prepared, and the basic properties of the mortar were measured. The results show that as the S/C ratio increases, the packing density of the mortar will decrease, the WFT will decrease, and the cohesiveness will increase, resulting in a decrease in the flow spread and strength of the mortar. When the PCE dosage is increased, the packing density of the mortar will increase, the WFT will increase, and the cohesiveness will decrease, which increases the flow spread of the mortar. When the water-cement (W/C) ratio is low, the S/C ratio has a significant effect on the strength, and the strength will increase with the increasing of the PCE dosage. When the W/C ratio is high, the strength of the mortar will be reduced once the PCE dosage exceeds the saturation value. In the case of different S/C ratios or different PCE dosages, the WFT can be used as a measure of mortar cohesiveness and flow spread.

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“…Hence, the three SPs yielded consistent results, because the addition of the SP agents enhanced the workability of the GEGM and made the slurry sticky. However, the addition of these agents reduced the compressive strength [ 57 , 58 , 59 ]. The main reason for this is that the addition of too much of these agents causes molecules to adsorb on the surface of the particles, which will hinder the surface tension of the cement mortar and cause many small air bubbles to form, resulting in a decrease in the compressive strength.…”

Section: Resultsmentioning

confidence: 99%

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

Juang

Kuo

2023

Materials

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With the active development of offshore wind power worldwide, the development of a green and ecofriendly grouting material (GEGM) has garnered global attention. Such a material must also be developed in Taiwan. Therefore, in this study, a series of environmentally friendly recycled materials were mixed in different proportions to develop a GEGM which can be implemented in the future construction of offshore wind turbines. To evaluate the mechanical properties of the GEGM, low water-to-binder (W/B) ratios (i.e., 0.21, 0.27, and 0.35) were used; cement was replaced with fixed amounts (20%) of ground granulated blast-furnace slag and fly ash; 2%, 2.5%, and 3% superplasticizers (SPs) were added; and two levels of sand content (60% and 70%) were used. The setting time of the GEGM was used to evaluate its workability; its compressive strength and flexural strength were used to evaluate its mechanical properties; and its sulfate resistance, length changes, and four-terminal resistance were used to evaluate its durability. The relationship between the durability and drying shrinkage of the GEGM was subsequently evaluated, and the ratio of final to initial setting times (F/I value) was calculated to determine the effects of the amount of SP added on workability. The highest F/I value (7.7) was achieved when 2 wt.% modified lignin sulfonate (MLS) was added because of the high viscosity of MLS, which compromised the workability of the concrete. The optimal compressive strength (83.62 MPa) was achieved when a W/B ratio of 0.21 was used, when the sand content was 70%, and when a 2% polycarboxylate superplasticizer (PCE) was added, whereas the optimal flexural strength (20.86 MPa) was achieved when 2.5% PCE was added. According to the nondestructive test results and the R2 value (>0.7) obtained from regression analyses of mechanical properties, the study results are reliable and may serve as a reference for future construction projects.

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Study of the Rheological Behavior of Mortar with Silica Fume and Superplasticizer Admixtures According to the Water Film Thickness

Cited by 13 publications

References 35 publications

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Influence of Sand-Cement Ratio and Polycarboxylate Superplasticizer on the Basic Properties of Mortar Based on Water Film Thickness

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

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