Formulation parameters effects on the performances of concrete equivalent mortars incorporating different ratios of recycled sand

Ghorbel, Elhem; Gomart, Hector; Matar, Pierre

doi:10.1177/1744259119896093

Cited by 14 publications

(6 citation statements)

References 33 publications

(50 reference statements)

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“…Hence, by transforming the granulometric curve into a fractal line and calculating the value of the fractal dimension (FD), (Abdeldjalil & Yous 2020;Abdeldjalil 2022;Ghorbel et al, 2019;Abdeldjalil 2022), was able to identify the granular distribution of the dune sand utilized as a granular component of concrete.…”

Section: Realistic Studies Of Natural Sandsmentioning

confidence: 99%

Determining the characteristics of dune sand used in the building of different sites for the desert environment.

Abdeldjalil¹,

Akacem²

2023

Preprint

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In earlier research, it was found that the characteristics of all types of natural sands must be identified in order to know the extent to which they can be used in the desired field. This study is based on the identification of the physical and chemical characteristics of 24 dune sands located in southwest Timimoun and Adrar The majority of the dunes are classified as particles sands. Sand has been used as a building material since antiquity, especially in Saharan regions where dunes are present. According to sand equivalence tests, all sands are extremely clean, which is confirmed by the fineness modulus of the sand. The chemical properties of the different dune sands were analyzed in the laboratory. The chemical analysis showed that the dune sands of these regions are siliceous sands; the lowest dose of siliceous component is 84%, while the maximum concentration of limestone is 9.55%. The sulfate content does not exceed 1.15 meq/l, which confirms the classification of dune sands as inert material. The use of these sands as raw materials in industry is therefore closely controlled. Moreover, this encourages us to further study these sands and use them as granular construction materials.

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Section: Realistic Studies Of Natural Sandsmentioning

confidence: 99%

Determining the characteristics of dune sand used in the building of different sites for the desert environment.

Abdeldjalil¹,

Akacem²

2023

Preprint

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“…This concrete mix was denoted as hybrid nucleation accelerated concrete (HNAC). For repair application purpose, a concrete equivalent mortar (CEM) was developed based on the method by Ghorbel et al [19] by removing coarse aggregate from the HNAC. The mix designs for HNAC and CEM are given in Table 5.…”

Section: Proportioning and Sample Preparationmentioning

confidence: 99%

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Yeo,

Mo,

Mahmud

2023

Buildings

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This research focuses on achieving early strength of cement-based materials through the hybrid nucleation acceleration method. Through the study of various mortar mixtures, which incorporate components such as ordinary Portland cement (OPC), fine limestone powder (with a particle size of d50: 1 μm), coarse limestone powder (with a particle size of d50: 12 μm), calcium silicate hydrate (C-S-H) nucleation seeding agent, and calcium nitrate (CN), the effect of the hybrid nucleation acceleration method was investigated. When OPC was substituted with 20% fine limestone powder, a strength of 13.5 MPa was achieved at 6 h, whereas the use of coarse limestone powder only yielded 3.5 MPa within the same time frame. The mortar containing 2% C-S-H nucleation seeding agent reached an impressive 16 MPa at 6 h. Meanwhile, through the synergistic combination of fine limestone powder and C-S-H nucleation seeding agent, the 6 h early strength attained an impressive 19 MPa. The micrograph revealed that the hybrid nucleation acceleration method significantly promoted the formation of a dense network of C-S-H within the paste, thus enhancing the packing density. Measuring the heat release demonstrated that the samples accelerated with the C-S-H nucleation seeding agent and fine limestone reached the peak 160 min earlier than the OPC sample, indicating a faster hydration process. The hybrid nucleation accelerated concrete (HNAC) achieved strengths of 20 MPa and 27 MPa within 6 and 8 h, respectively, whereas the 28-day strength surpassed 70 MPa. The concrete equivalent mortar (CEM), derived from concrete, attained a compressive strength of 25 MPa within 8 h, making it suitable for repair applications. The modulus of rupture (MOR) was 7.31 MPa at 8 h and increased to 17.27 MPa at 28 days. Overall, the developed concrete and CEM with the novel hybrid nucleation acceleration method allowed for high early and long-term strength for fast-track construction to be attained.

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“…Mercury intrusion porosimetry (MIP) is a non-standardized, yet widely applied method to evaluate pore volume, size and distribution in a mortar matrix [17,18,19]. For this experimental campaign, the samples for MIP were extracted from the intact mortar prism pieces, remaining after mechanical testing.…”

Section: Porositymentioning

confidence: 99%

Comparative Evaluation of Properties of Laboratory Test Specimens for Masonry Mortars Prepared Using Different Compaction Methods

Grigorjev

Azenha

Belie

2023

Conservation and Restoration of Historic Mortars and Masonry Structures

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Development of new solutions for masonry mortars is heavily reliant on laboratory-based experimental procedures. This study provides insights into the properties of masonry mortars, prepared by four distinct compaction methods, based on existing standards: tamping, tapping, jolting and vibrating. The particular mortar mix under study has been designed in volumetric proportions of 1:1:6 with air lime, cement and sand, respectively. Evaluation of differences among compaction methods is based on bulk density, mechanical strength, porosity and water absorption measurements at 7 and 28 days. Density and strength testing results indicate statistically significant differences, where mechanically compacted mortars are denser and stronger than their manually compacted counterparts. Similar development is observed through assessment of mortar porosity. The variation is noticeable in gel and capillary pore range as shown by mercury intrusion, while open porosity evaluated by vacuum immersion also indicates some distinction between manual and mechanical compaction, with the latter producing less porous mortars. On the other hand, capillary water absorption results reveal higher coefficients for jolted and vibrated samples, hinting at different pore interconnectivity in mechanically and manually compacted mortar specimens.

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Formulation parameters effects on the performances of concrete equivalent mortars incorporating different ratios of recycled sand

Cited by 14 publications

References 33 publications

Determining the characteristics of dune sand used in the building of different sites for the desert environment.

Determining the characteristics of dune sand used in the building of different sites for the desert environment.

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Comparative Evaluation of Properties of Laboratory Test Specimens for Masonry Mortars Prepared Using Different Compaction Methods

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