Engineering and Mineralogical Properties of Portland Cement Used for Building and Road Construction in Cameroon

Duna, Linda Lekuna; Audrey, Nguimeya Nguepi Gide; Tchamba, Arlin Bruno; Billong, Ndigui; Kamseu, Elie; Qoku, Elsa; Alomayri, Thamer; Bier, Thomas

doi:10.1007/s42947-021-00055-9

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…5 and 8 above) with the absence of very fine particles that can contribute to the reduction of the pore space in the material. The compressive strength of cement obtained in this study, especially at 28 days, are low compared to those of CEM II/A-P 42.5R cements used in Cameroon and studied by [32]. These cements studied by [32] contain 80-94% clinker, 6-20% volcanic scoria and 0-5% secondary components.…”

Section: Characteristics Of Formulated Cementscontrasting

confidence: 58%

“…It is at this consistency that the optimum values of the physical and mechanical properties of the specimens are achieved (porosity, water absorption, compressive strength, etc.) In this study, the W/C ratio was determined in accordance with the ASTM C187-16 procedure, using the Vicat apparatus [31,32].…”

Section: Determination Of Water-to-cement (W/c) Ratio and Setting Timementioning

confidence: 99%

“…The setting times of the different cements were also determined, after determination of the W/C ratio, by means of the Vicat apparatus and according to the procedure of the ASTM C191-13 standard [32,33]. This test allows to evaluate the reaction speed of the different raw material with the OPC.…”

Section: Determination Of Water-to-cement (W/c) Ratio and Setting Timementioning

confidence: 99%

“…With f cj = compressive strength at j days expressed in MPa, F = compressive breaking strength expressed in Newton (N) and S = compressed surface of the specimen expressed in mm 2 . The measurement of water absorption is carried out in accordance with ASTM C948-81 [32,34]. In this case, two samples are used per formulation of cement to determine the water absorption rate of the different hardened cements.…”

Section: Determination Of Compressive Strength and Water Absorption Ratementioning

confidence: 99%

“…These cements studied by [32] contain 80-94% clinker, 6-20% volcanic scoria and 0-5% secondary components. Furthermore, according to the recommendations of EN 196-1 reported by [32], only CMkm1, CMkb1 and The study of the f c28 /f c56 ratio (f cj = compressive strength at j days of cure) (Table 4) shows that at 28 days, CMkm and CMkb cements (from 10 to 40% of calcined clay), achieve compressive strength greater than 91,5% of those obtained at 56 days as recommended by the [42], unlike CPNf dosed between 20 and 40%, the strengths of which at 28 days are less than 80% of those obtained at 56 days. Indeed, according to [42], Eq.…”

Section: Characteristics Of Formulated Cementsmentioning

confidence: 99%

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The viability of calcined clays and volcanic scoria from western Cameroon as Supplementary Cementitious Material (SCM)

et al. 2022

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In order to promote the use of calcined clays and volcanic scoria from the western Cameroon as Supplementary Cementitious Material (SCM), the physical, chemical and mechanical properties of fresh and hardened cements were investigated. The cement was formulated by substituting 10, 20, 30, and 40% of clinker by calcined clays from Mayouom (Mkm) and Balengou (MKb), and volcanic scoria from Foumbot (PNf). For each of the three raw materials, the loss on ignition is less 1%, the sum %SiO 2 + %Al 2 O 3 + %Fe 2 O 3 is greater than 70%, amorphous phase is present and pozzolanic reactivity with the Chappelle test is greater than 80% of Ca(OH) 2 consumed. This makes it possible to classify MKm, MKb and PNf among the pozzolanic materials. The addition of calcined clay to the clinker, result to an increase in the water to cement ratio, unlike the Foumbot pozzolan, which does not really affect this ratio. The three raw material act as setting retarders, with PNf having a greater retarding effect than MKm and MKb. The compressive strengths of the cements formulated in this study shows that with 10% clinker substitution, cements of class 42.5 can be obtained, and that from 20% onwards, the cements obtained are of class 32.5. However, an addition of more than 20% PNf in the clinker produces cements with strength less than 30 MPa at 28 days. Calcined clay from Balengou and Mayouom could be used as a viable alternate source of SCM for cement production with better performances compared to volcanic scoria from Foumbot.

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Section: Characteristics Of Formulated Cementscontrasting

confidence: 58%

Section: Determination Of Water-to-cement (W/c) Ratio and Setting Timementioning

confidence: 99%

Section: Determination Of Water-to-cement (W/c) Ratio and Setting Timementioning

confidence: 99%