Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

Figmig, Robert; Estokova, Adriana; Lupták, Miloslav

doi:10.3390/ma14061448

Cited by 9 publications

(7 citation statements)

References 129 publications

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“…Water absorption is one of the engineering properties related to permeability while porosity is a physical parameter governing mechanical properties and durability of materials 43–45 . Table 6 presents water absorption and porosity of the reference (OPC) and SRC eco‐cements (R00‐R45) at 28, 56, and 91 days.…”

Section: Resultsmentioning

confidence: 99%

Effect of ground rice husk ash on engineering properties and hydration products of SRC eco‐cement

Bùi

Ngo

Huynh

2021

Env Prog and Sustain Energy

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The effect of ground rice husk ash (GRHA) (R) on engineering properties and hydration products of eco‐cements containing ground granulated blast furnace slag (GGBFS) (S) and circulating fluidized bed combustion ash (CFA) (C) was studied. Four mixture proportions of SRC eco‐cements with GRHA replacement at levels of 0%, 15%, 30%, and 45% by mass of binder were investigated. A reference mixture proportion of paste with 100% ordinary Portland cement (OPC) was prepared for comparison purposes. A series of laboratory tests including setting time, compressive strength, water absorption, porosity, thermal conductivity, scanning electron microscope coupled with energy dispersive spectroscopy, X‐ray diffraction, and Fourier‐transform infrared spectroscopy analysis was carried out. Measured results showed that the GRHA increased setting time and porosity in the SRC eco‐cements having a water‐to‐powder (w/p) of 0.4, leading to the decrease in compressive strength and thermal conductivity while the increase in water absorption. The GRHA increased the cristobalite amount and decreased the portlandite amount in the SRC eco‐cements at the age of 28 days, resulting in the more significant long‐term compressive strength development when compared with the reference paste with 100% OPC. Consequently, the GRHA could be used at a level of 15% by mass of binder to produce the SRC eco‐cement with the compressive strength at 28 days of higher than 30 MPa and the thermal conductivity of 0.713 W/mK, resulting from the formations of AFt, C–S–H, and C–A–S–H gels.

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Section: Resultsmentioning

confidence: 99%

Effect of ground rice husk ash on engineering properties and hydration products of SRC eco‐cement

Bùi

Ngo

Huynh

2021

Env Prog and Sustain Energy

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“…And absorption values decrease with increasing metakaolin content in mortar [25,26]. This reduction in absorption is due to the greater fineness of the various additions compared to cement [27]. Pozzolans fill the pores in the bulk paste or in the interfaces between the aggregate and the cement paste.…”

Section: Linear Shrinkagementioning

confidence: 99%

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Bayiha¹,

Bahel²,

Kenmogné³

et al. 2023

Global J. Eng. Technol. Adv.

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The comparative study of some effects of natural and artificial pozzolans on the hydraulic properties of Portland cement mortar is performed in this work. The natural pozzolan used coming from the Djoungo deposit, Moungo department in the Littoral region (Cameroon) was finely ground and then sieved at 100 μm. The artificial pozzolan used is the alluvial clay of Etoa collected from Yaoundé III District in Mfoundi Division of the Centre Region of Cameroon. It was thermally activated at 700°C after grinding and sieving. The chemical and mineralogical analysis of the raw materials were studied by X-ray fluorescence, infrared spectrometry (FTIR) and X-ray diffraction (XRD) then the specific surfaces and the absolute densities were determined. The formulation of the pastes and mortar was obtained by substituting Portland cement with different pozzolans at different percentages, while the initial and final setting time of the fresh pastes were determined. Linear shrinkage, water absorption, apparent density, flexural strength and compressive strength tests at 7 and 28 days were determined on the hardened mortars. The results obtained show an increasing in the initial and final setting time with the addition of the amount of pozzolan (natural or artificial), the pozzolans played the role of setting retarder in the mixtures, finer particles of the artificial pozzolan speed up the setting time of pastes as compared to that with natural pozzolan. The shrinkage of the hardened mortars increased with the addition of the pozzolans, but it was less than 0.2% in all the samples, the specimens with artificial pozzolans were more affected by the drying shrinkage. The mortars had good mechanical resistance but from 30 to 40% pozzolan, whether artificial or natural, the resistance dropped, the dilution phenomenon caused by the partial replacement of the cement was responsible for the drop in resistance with the addition of pozzolans. The water absorption rate and the apparent density of the specimens decrease when the percentage of pozzolan increases in the mortars. Artificial pozzolan offers a better water absorption rate compared to natural pozzolan due to its higher specific surface. Natural pozzolan makes it possible to obtain a denser mortar.

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“…Cement is a hydraulic binder obtained by ring of mainly limestome and clay at approximately 1400 o C [9], 1450 o C [22], and 1450-1500 o C [14], with addition of gypsum, and in some cases, of additives [4,13,23]. Additives are natural occurring substances (minerals or rocks) and industrials products with properties suitable to partially replace clinker during the last stage cement manufacturing [4,12,14,23]. Examples of used additives include volcanic scoria, blast fumace slag, silica fume, siliceous y ash, calcareous y ash, limestone nes, shale, metakaolin and cement kiln dust [4,10,11,13,14,17].…”

Section: Characteristics Of Cement Kiln Dustmentioning

confidence: 99%

Cement Kiln Dust in CIMENCAM Figuil (North Cameroon): characteristics and recycling as additives for blended cement production

KANOUO

TOUMBA

Dikwa

et al. 2023

Preprint

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This work presents the manufacture of CKD-blended cement from raw materials such as clinker, gypsum, marble and cement kiln dust (CKD) obtained from CIMENCAM Figuil, North Region of Cameroon. The raw materials were first characterized through XRF and physical properties such as fineness, consistency, setting time, and expansion were determined from the cement paste. Clinker is composed of CaO (65.30 %) and SiO2 (21.13%), with significant MgO (2.71%) Na2O+K2O (1.29%), SO3 (0.81 %) and lime saturation factor (LSF) of (97.9); which make this clinker good for cement production. Gypsum is composed of SO3 (36.32 %) and CaO (33.92 %) but contains very low proportion of impurities; it is therefore classified as low-impurities gypsum suitable for cement productions. The marble is dominantly composed of CaO (37.09 %) with significant SiO2 (7.26 %), SO3(2.40%), (2.36 %), Fe2O3 (1.82 %) and MgO (0.18 %); it is classified as low-CaO calcitic-aluminosilicate and ironsilicate bearing marble. The cement kiln dust (CKD) is dominantly made up of CaO (46.0 %) and SiO2 (11.62 %) with significantly low Na2O+ K2O (1.02 %), and SO3(2.16 %); this classifies its as low alkalies-sulfate cement kiln dust. CKD-blended cements which contains free lime (0.8-2.5, SO3 (above 1.7 to 2.5), loss on ignition (LOI), and insoluble residues (6.71-9.62 %) which increase with an increase in the proportion of CKD. The blaine specific surface area (BSSA) (4797-6346 cm2/g) and the sieved remaining proportion (26.14-30.36 %) show an increase with the proportion of used CKD; The compressive strength test was carried out at 2, 7, 28 days which shows that, the resistance depends on the proportion of the used CKD (0% control, 5%, 10%, 15%, 20%... up to 50%). Pressures of 17.5 to 11.6 MPa was obtained in 2 days, 28.9 to 20.0 Mpa in 7 days, and 35.5 to 23.3 Mpa in 28 days.

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Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

Cited by 9 publications

References 129 publications

Effect of ground rice husk ash on engineering properties and hydration products of SRC eco‐cement

Effect of ground rice husk ash on engineering properties and hydration products of SRC eco‐cement

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Cement Kiln Dust in CIMENCAM Figuil (North Cameroon): characteristics and recycling as additives for blended cement production

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