Analysis of Strength Hydraulic Concrete Produced with a Mixture ofCrushed Gneiss and Alluvial Sand

Leroy, Mambou Ngueyep Luc; Molay, Tchapga Gniamsi Guy; Ndop, J.; Bienvenu, Ndjaka Jean Marie

doi:10.4172/2168-9873.1000289

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…These results can be explained by the high proportions of fine particles in the crusher sands, compared to the river sand. The results obtained here differ slightly from those of Luc Leroy [8], showing that the substitution of river sand with 75% crushed sand provides high strength values at 28 days. However, these differences can be explained by the conditions under which the cement content was carried out in the two experiments Figure 12 shows the variation of stress as a function of compressive displacement (Figure 12a) and the elastic parts of the stress-strain curves (Figure 12b) of concretes with 50% and 0% crushed sand at 90 days of age.…”

Section: Gas Permeabilitycontrasting

confidence: 92%

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Microstructure and Mechanical Behavior of Concrete Based on Crushed Sand Combined with Alluvial Sand

et al. 2020

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The aim of this work is to reduce the overexploitation of river sand by proposing a combination of crushed sand and river sand to develop an optimal mix design for concrete. The approach used consisted of a physical, chemical, and mineralogical characterization of aggregates from three quarries located in Yaoundé (Cameroon), followed by the formulation of concrete by substituting 100%, 90%, 80%, 70%, 50%, and 0% of the river sand with crushed sand. A physical and mechanical characterization of the concrete was carried out, as well as a microstructural characterization using SEM/EDS. The results showed that the concrete made of crushed sand only had a higher drying shrinkage at a young age compared to the river sand concrete. Compared to conventional concrete (made using 100% of river sand), the concrete with 50% crushed sand reduces its slump value, has a lower porosity, and has a compressive strength value of 26.3 MPa at 28 days, which is very similar to that of conventional concrete (26.7 MPa). Moreover, it was found that the strength of the concrete increased by 14.4% and 20.6%, respectively, for concrete without crushed sand (BSR0) and concrete with 50% crushed sand (BSR50) by increasing the curing age from 28 to 90 days. The static modulus of elasticity for conventional concrete BSR0 and BSR50 concrete with 50% crushed sand at 90 days was 23.7 and 21.8 GPa, respectively. Thus, combining crushed sand with alluvial sand is a good method to reduce the depletion of alluvial sands in Cameroon.

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Section: Gas Permeabilitycontrasting

confidence: 92%

“…The cement used in this study was Portland cement NC CEM, class 42.5 R, with a fineness of 3425 cm 2 /g and a density of 3.14 g/m 3 [8] from Dangoté company (Cameroon). The chemical composition of the cement (Table 1) was determined by X-ray fluorescence on an ICP-AES spectrometer, according to DIN EN ISO 12677.…”

Section: Cementmentioning

confidence: 99%

Microstructure and Mechanical Behavior of Concrete Based on Crushed Sand Combined with Alluvial Sand

et al. 2020

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“…Moreover, analysis of strength hydraulic concrete produced with a mixture of crushed gneiss and alluvial sand was done by Luc Leroy Mambou Ngueyep et al [7]. In their work, the percentage of gneiss powder added by weight was 0%, 25%, 50%, 75% and 100% as a replacement of river sand used in normal concrete.…”

Section: Introductionmentioning

confidence: 99%

Microstructure analysis of hydraulic concrete using crushed basalt, crushed gneiss and alluvial sand as fine aggregate

et al. 2020

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This paper presents an experimental study of the microstructure of concrete using crushed sands and river sand. Three sands with different geological nature have been investigated in this work. Sand from crushed basalt (SB), sand from crushed gneiss (SG) and sand from river Sanaga (SS) were used for the formulation of these concretes. The results of the analysis show that concrete made from alluvial sand (BSS) has very good compressive strength (33.72 MPa at 28 days) followed by concrete made with crushed basalt (BSB), (33.59 MPa at 28 days) and finally concrete made from crushed gneiss (BSG) (29.83 MPa at 28 days). The same result is also obtained with splitting strength. X-ray diffraction (XRD), enthalpy thermal analysis (HDSC) and thermogravimetric analysis (TAG) were also used to identify physical, chemical and mineralogical behavior of microstructure of various concrete. From the XRD analysis, it was noted that crushed sand gneiss (BSG) contain biotite and amphibole which could justify its poor compressive strength of BSG concrete. Enthalpy thermal analysis (HDSC) and thermogravimetric analysis (TAG) reveal that all concrete could be used in the structure at elevated temperature.

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Analysis of Strength Hydraulic Concrete Produced with a Mixture ofCrushed Gneiss and Alluvial Sand

Cited by 2 publications

References 4 publications

Microstructure and Mechanical Behavior of Concrete Based on Crushed Sand Combined with Alluvial Sand

Microstructure and Mechanical Behavior of Concrete Based on Crushed Sand Combined with Alluvial Sand

Microstructure analysis of hydraulic concrete using crushed basalt, crushed gneiss and alluvial sand as fine aggregate

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