Evaluation of Pozzolanic Activity of Illitic and Lateritic Raw Materials from Burkina Faso

Sanou, Issa; Seynou, Mohamed; Zerbo, Lamine; Millogo, Younoussa; Ouedraogo, Richard; Sana, Adil

doi:10.9734/csji/2017/30995

Cited by 6 publications

(5 citation statements)

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“…In the figure it depicts the solubility curve of portlandite and the position of each pozzolan and the control with respect to this curve. Accordingly, it shows that the pozzolans located well below the curve show more pozzolanic characteristics than the control [64]. Hence the Frattini test conducted here shows that RHA has the required pozzolanic activity.…”

Section: Frattini Testmentioning

confidence: 50%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates, respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of pozzolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.

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Section: Frattini Testmentioning

confidence: 50%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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“…From this figure it follows that the CPA located above the solubility curve has no pozzolanic activity. While the RHA located below this same curve has a pozzolanic character [18].…”

Section: Mechanical Strengthmentioning

confidence: 90%

Study of the Mechanical Behaviour of Mortars Modified with Rice Husk Ash

Sanou¹,

Sawadogo²,

Seynou³

et al. 2019

JMMCE

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The purpose of this work is to study the influence of Rice Husk Ash (RHA) on the mechanical strength of mortars. For this purpose, ash was produced by calcining rice husk at 680˚C for 5 hours to produce reactive pozzolan. The chemical and mineralogical composition studied by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and X-Ray Diffraction (XRD) showed that this ash is rich in amorphous silica. The ash presents a good pozzolanic activity with a lime fixation rate of 100% after only 7 days of treatment. The addition of RHA to cement contributes to the formation of calcium silicate hydrate (CSH) and calcium aluminate hydrate of C 3 ASH 6 type. The presence of RHA in the mortars improves their mechanical strength. This improvement is due to the filler effect of RHA and to formation of the CSH resulting from the pozzolanic reactivity between the amorphous silica of the RHA and the portlandite released by hydration of the cement.

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“…Figure 2 shows a diagram for assessing the pozzolanic activity provided in EN 169-5. Results that fall below the lime solubility curve show pozzolanic reactivity, as indicated by the removal of Ca 2+ from the solution [36]. Decreasing the hydroxyl content results in increasing C-S-H and C-A-S-H nuclei [37].…”

Section: The Frattini Chemical Titration Methodsmentioning

confidence: 97%

“…reactivity, as indicated by the removal of Ca 2+ from the solution [36]. Decreasing the hydroxyl content results in increasing C-S-H and C-A-S-H nuclei [37].…”

Section: The Frattini Chemical Titration Methodsmentioning

confidence: 99%

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Comprehensive Review of Direct and Indirect Pozzolanic Reactivity Testing Methods

Elyasigorji,

Farajiani,

Hajipour Manjili

et al. 2023

Buildings

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The production of portland cement is among the major contributors to greenhouse gas emissions that adversely affect the environment. Identifying sustainable materials to partially replace portland cement in concrete, such as pozzolanic materials, is crucial in addressing this issue. These materials mainly consist of silica and alumina that react with the available calcium hydroxide to form strength-bearing phases such as calcium silicate hydrates. Understanding the degree of pozzolanic reactivity of materials using efficient reactivity test methods is an important consideration. The paper thoroughly reviews the available literature related to direct and indirect pozzolanic reactivity test methods that have been utilized over the years. Direct methods quantify the amount of consumed calcium hydroxide, whereas indirect methods assess changes in the physical properties of the specimen due to pozzolanic reactions. The aim of this paper is to identify affordable, time-saving, and effective direct and indirect methods. Based on this study, the Frattini, electrical conductivity, and pH tests are considered the most time-efficient methods to assess pozzolanic materials. Electrical conductivity and pH tests are also easy to perform. In contrast, other methods are more time-consuming.

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Evaluation of Pozzolanic Activity of Illitic and Lateritic Raw Materials from Burkina Faso

Cited by 6 publications

References 0 publications

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Study of the Mechanical Behaviour of Mortars Modified with Rice Husk Ash

Comprehensive Review of Direct and Indirect Pozzolanic Reactivity Testing Methods

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