Ndigui Billong

Ndigui Billong
Laboratory of Materials Analysis · MIPROMALO, Cameroon

PhD

About

38
Publications
11,960
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626
Citations
Citations since 2017
25 Research Items
524 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (38)
Article
Full-text available
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 all...
Article
Full-text available
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...
Article
Full-text available
In the present study, multi-scale sized porous inorganic polymers were produced by alkaline activation of volcanic ash. Rice husk ash, an agricultural biomass, was used both in the synthesis of the alkaline activator and as pore inducing agent. Hardened porous geopolymers underwent mineralogical analysis, compressive strength and apparent density t...
Article
Full-text available
This study focuses on the improvement of products manufactured in a semi-industrial fired brick factory in Yaoundé, Cameroon. More specifically, it focused on the influence of the water content on the physical characteristics in the manufacturing process. In the course of this work, the evolution of the water content, the volume shrinkage, the mass...
Article
In the present study, un-densified silica fume was reacted with a 10 M sodium hydroxide solution to produce the sodium silicate gel having a pH of 14. The calorimetry of the reaction was evaluated. The gel was dried to increase its density by almost 35%. Thereafter, the thermogravimetry of the gel was performed at temperatures up to 1000 °C. Except...
Article
In this study, the engineering characteristics of Portland cement samples (CM1, CM2, CM3 and CM4) from four manufacturers in Cameroon were evaluated to know their physical and mineralogical properties to be used in different environments. For this purpose, many analyses such as physical properties (setting time, consistency, compressive strength, f...
Article
The effectiveness of using silica fume based sodium silicate in the production of metakaolin (MK) and ground granulated blast furnace slag (GGBS) based geopolymer was investigated. Un-densified silica fume was appropriately dissolved in a 10 M sodium hydroxide solution to obtain a sodium silicate alternative (SSA) solution having the SiO2/Na2O mola...
Article
Full-text available
Ground Granulated Blast-furnace Slag (GGBS) and Pulverised Fuel Ash (PFA) were used to replace up to 60% of Portland cement (PC) in concrete. The testing program of the concrete included the determination of the consistency of fresh concrete, the measurement of the density and compressive strength of the hardened products cured for up to 56 days an...
Article
Full-text available
In the present study, physico-chemical investigations were carried out on hydrated lime produced from the limestone of the travertine outcrop of Bogongo in the South West Region of Cameroon. The aim was to evaluate the suitability of that hydrated lime as building lime. The raw material was characterized and then fired at 900 °C. The fired product...
Article
Limestone was used to modify the fluxing action of two potash feldspars (a pure potash feldspar and a soda-potash feldspar) labeled P and C, respectively, in the formulation of porcelain stoneware based on Cameroonian raw materials. The effect of limestone addition (0–10 mass%) was investigated in the range of sintering temperature between 1125 and...
Article
Full-text available
Abstract This study focuses on the mineralogical, geochemical and petrographic characterization of three granite rock samples (LTP, LTS and LTMB) from Foumban, West Region of Cameroon. Fusibility tests were carried out on the samples containing the highest amount of alkali to assess the potential of these materials as fluxing admixture for ceramics...
Article
Volcanic ashes are pyroclastic materials commonly found in many regions of the world. Many deposits of volcanic ashes are unexploited, despite their potential interest for several engineering applications. The mineralogy and chemical composition of volcanic ashes depend on the type of magma from which they originate. The two common pyroclastic mate...
Article
Volcanic ashes are pyroclastic materials commonly found in many regions of the world. Many deposits of volcanic ashes are unexploited, despite their potential interest for several engineering applications. The mineralogy and chemical composition of volcanic ashes depend on the type of magma from which they originate. The two common pyroclastic mate...
Article
This paper reports the development of inorganic polymers from laterite, for a potential use at least as non-load bearing building materials. The effect of blending laterite with Ground Granulated Blast Furnace Slag (GGBS) and calcite (CaCO 3) was investigated. Laterite was substituted by calcite at 2 to 20% in mass and by GGBS at 5 to 50% in mass....
Article
The effect of 0–60% limestone powder in thermally activated halloysite clay (TAH) based geopolymer pastes cured at 24 ± 2 �C was investigated. Metakaolin source using halloysite which is an available mineral can be an alternative to fired kaolinite. The alkaline solutions used were mixtures (1:1 vol ratio) of sodium silicate and sodium hydroxide (N...
Article
The objective of the present work is to study the effect of RHA on the performance of fresh and hardened metakaolin geopolymer pastes with focus on tensile strength and microstructure. The metakaolin was partially substituted by 12.5–50% RHA in the solid mixes and reacted with 10 M sodium hydroxide solution at ambient conditions of 20 ± 3 °C and 70...
Article
Full-text available
Despite the presence of raw materials (limestone and clay) deposits for Portland cement production, the major part of cement sold in Cameroon is from crushed imported clinker. This contributes to high cost of this material and reduction of local employment. In this study and based on existing data, a multi-criteria analysis tool was developed and a...
Article
Volcanic ashes are pyroclastic materials commonly found in many regions of the world. Many deposits of volcanic ashes are unexploited, despite their potential interest for several engineering applications. The mineralogy and chemical composition of volcanic ashes depend on the type of magma from which they originate. The two common pyroclastic mate...
Article
This paper reports the development of inorganic polymers from laterite, for a potential use at least as non-load bearing building materials. The effect of blending laterite with Ground Granulated Blast Furnace Slag (GGBS) and calcite (CaCO 3) was investigated. Laterite was substituted by calcite at 2 to 20% in mass and by GGBS at 5 to 50% in mass....
Article
Rice husk ash (RHA), a by-product from the rice industry, was used as principal source of amorphous silica for the production of sodium silicate solution (MR ∼ 3) used for the replacement of standard commercial sodium silicate in the mix-design of metakaolin based geopolymer composites. Three initial concentrations of NaOH were considered (8, 10 an...
Article
Clinker which is the major constituent of Portland cement can be purchased from the world market or manufactured locally if the raw materials are available. Where it is manufactured locally, as in the second case, it is necessary to use a deposit of limestone and clay that meet the physical and chemical requirements for an efficient clinker. In thi...
Article
Full-text available
In the present study, physico-chemical investigations have been carried out on the possibility of using Cameroonian volcanic or clay pozzolans as raw material for geopolymer or pozzolanic binder. The research had made some suggestive results and conclusions. Powders of less than 100 μm of five sampled pozzolans from volcanic or clay origins have be...
Article
Indurated lateritic blocks (yellow-brown and red) were collected from two deposits in Yaounde, Cameroon for investigation as structural building and construction materials. Dimensioned blocks were characterized using XRD, DTA/TGA, mechanical compression, water absorption and porosity tests, and examination by optical and electron microscope. Water...
Article
To improve long-term hydraulic properties of binders from RHA and lime, 25–75% MK was added to RHA. Binders were formulated and properties were compared to that containing RHA or MK as only pozzolans. The lime–pozzolan ratio was 1:3. The properties tested after 7, 28 and 56days were: absolute density and fineness of the binders, initial setting tim...
Article
Full-text available
In the paper, the lime-barium and lime-zinc glazes used in Southern and Eastern Africa Mineral Center (SEAMIC) ce-ramic unit in Tanzania were investigated for the production of high temperature raw glazes in Cameroon. The base Seger formula used was 0.3KNaO, 0.3CaO, 0.4ZnO or BaO; xAl 2 O 3 and ySiO 2 . Different Al 2 O 3 /SiO 2 formula ratios for...
Article
In the present study, percentage of slaked lime (20–30%) in binder with metakaolin, water–binder ratio (0.8–1.0), sand–binder ratio (1–3) and sodium hydroxide (NaOH)–binder ratio (0.02–0.04) were factors varied to investigate properties of fresh or hardened mortars. Sodium hydroxide was used as a chemical activator in the slaked lime–metakaolin bin...
Article
In this study, a pozzolanic binder containing lime and a common thermally activated kaolinitic clay, at 750 °C, was formulated. The chemical, mineralogical and pozzolanic properties of raw materials were determined. The percentage of lime in the binder varies between 20% and 30%. The binder was used as a stabilizer in compressed lateritic soil in w...
Article
A complete investigation on the sintering behaviour, involving ceramic transformation, of volcanic ash is reported. Sintering and softening points, vitrification and fusion of finely ground powders of volcanic ash were obtained by hot stage microscope observation. Then, a suitable thermal cycle, which matches the better microstructure and mechanica...
Article
The present study concerns the effect of 0.5 to 4 % trona (NaCO 3·NaHCO3·2H2O) in the form of a saturated solution on the consistency, the setting, the hydration temperature and the mechanical strength of a M CEM UVB cement. In comparison, the effect of 1 % and 4% of calcium chloride in the cement have been also studied. The results showed that the...
Article
Full-text available
Investigation on the use of volcanic ash as 100% raw materials for traditional vitrified ceramic products is reported. X-ray diffraction (XRD), thermogravimetric-thermal differential analyses (DTA-TGA) and chemical analysis were used to characterise raw samples. Fired specimens were used to evaluate their ceramic properties. Volcanic ash contains e...
Article
The pozzolanic activity of waste fired bricks and tiles from three production units in and around Yaounde were studied. The raw materials (lateritic clays) of the wastes are kaolinitic and of low plasticity. The clays calcined at 800 °C and the wastes, crushed to fine powders of Ø<32 μm were tested for their pozzolanicity using the Chapelle method....

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Projects

Projects (2)
Project
Apporter une valeur ajoutée au gisements de sables des fleuves du Cameroun et démontrant qu'ils peuvent être propice à la production du sable normalisé CEN EN 196-1. En effet, la principale utilisation des gisements de sables au Cameroun est leur emploi comme granulats dans les chantiers de construction, ce qui sous estime leur valeur économique.
Project
For application in high temperature automotive engineering and metallurgy