Cement production with pozzolans from residual tropical soils formed from paragneiss with a high silicon oxide content

Torres, Oscar Oswaldo Vasquez; Saldarriaga, Laura Carmona; Tobón, Jorge Iván

doi:10.15446/dyna.v87n213.83208

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…For the development of this research, four standard clays from The Clay Minerals Society were used, denominated as kaolinite 1 (Kaol1), kaolinite 2 (Kaol2)—which presents greater structural disorder than Kaol1—montmorillonite (Mt), and hectorite (Ht). In addition, a multicomponent clay was used, that is, a clay of low purity (mixed with other minerals) and low‐grade kaolinitic (54% kaolinite) called LgKM, which came from a Magdalena Medio Antioqueño region studied in Vasquez et al 24 …”

Section: Methodsmentioning

confidence: 99%

“…These methodologies basically consist of preparing the samples through material separation by size fractions, proceeding with their individual identification and mineralogical quantification for the subsequent total quantification of the samples under the Rietveld method, and comparing them with the calibration curves of pure minerals of Vasquez et al 24 . The database used in this mineralogical quantification was the International Centre for Diffraction Data (ICDD).…”

Section: Methodsmentioning

confidence: 99%

“…For the development of this research, four standard clays from The Clay Minerals Society were used, denominated as kaolinite 1 (Kaol1), kaolinite 2 (Kaol2)-which presents greater structural disorder than Kaol1-montmorillonite (Mt), and hectorite (Ht). In addition, a multicomponent clay was used, that is, a clay of low purity (mixed with other minerals) and low-grade kaolinitic (54% kaolinite) called LgKM, which came from a Magdalena Medio Antioqueño region studied in Vasquez et al 24 Mineralogical quantification and chemical composition of the standard clays, according to The Clay Minerals Society and Chipera, 25 are shown together with the results of SSA by Brunauer-Emmett-Teller method (BET), XRD, and X-ray fluorescence (XRF) of LgKM in Table 2. These results correspond to samples without mechanical intervention (0 s of milling time), discussed in Section 3.…”

Section: Raw Materialsmentioning

confidence: 99%

“…The LgKM came from the weathering and decomposition of metamorphic parent rocks of intermediate chemical composition, as determined in Vasquez et al, 24 specifically from Paragneiss and Orthoamphibolite protoliths. The LgKM was extracted from a mineral deposit located east of the Andes central mountain range, between the municipalities of Puerto Triunfo and Sonsón, Antioquia, Colombia; whose geographical coordinates of the study area correspond to 5 • 54'48" N, 74 • 47'7" W (Figure 1).…”

Section: Low-grade Kaolinitic Multicomponent Claymentioning

confidence: 99%

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Property modifications of low‐grade clay through physical treatments and its incidence in the pozzolanic activity

Vásquez-Torres

Cabrera-Poloche

2021

Int J Applied Ceramic Tech

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In the cement industry, it is usual to use calcined clays due to structural changes caused by thermal activations; however, there are other activation methods, such as mechanical activation by grinding. This method is not so common and has been relegated to the second level. Thus, in this work, the physical and mechanical changes in the structure of clays, induced by comminution processes, of standard clays and a low‐grade kaolinitic multicomponent clay, derived from weathering of metamorphic rock, were evaluated. These changes were measured using X‐ray fluorescence, X‐ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, specific surface area (SSA) by Brunauer–Emmett–Teller method, and lime fixing as a measure of pozzolanic activity. It was found that the milling process modified the structure of the clays and the pozzolanic activity, since the main reflection (001) disappeared, the dehydroxylation temperature decreased to a maximum differential of 150°C with 120 s of milling time, especially in T:O:T clays, and the SSA increased along with the lime fixing to a maximum of 119 m2/g and 46%, respectively. In this way, the milling process is effective for the mechanical activation of the clay, especially in multicomponent clay, making it interesting for use as supplementary cementitious material.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Raw Materialsmentioning

confidence: 99%

Section: Low-grade Kaolinitic Multicomponent Claymentioning

confidence: 99%

See 2 more Smart Citations

Property modifications of low‐grade clay through physical treatments and its incidence in the pozzolanic activity

Vásquez-Torres

Cabrera-Poloche

2021

Int J Applied Ceramic Tech

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Performance of Low-Grade Calcined Clays as Supplementary Cementitious Material in Relation to their Geological Characteristics

Vásquez-Torres

Cabrera-Poloche

Tobón

2022

Clays and clay miner.

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Calcined clays are used as a supplementary cementitious material (SCM) because, as hydrated aluminosilicates of the phyllosilicate group, they can be activated thermally, promoting dehydroxylation and structural disorder, i.e. making them reactive. The main effect of using calcined clay as an SCM is that CO2 emissions into the atmosphere are reduced by the reduction in the clinker/cement factor due to substitution of a proportion of clinker by calcined clay. Clays rich in kaolinite (1:1) group minerals offer most promise in terms of thermal activation. However, increased costs caused by demand for kaolinite from other industries means that type 2:1 calcined clays and mixtures of them have begun to be investigated as possible pozzolanic materials. The physical, chemical, and mineralogical characteristics that control the performance of these calcined clays as SCMs are still under discussion. Few in-depth studies of the behavior of these characteristics have been reported. The origin and geological history of raw materials, as well as their impact on the thermal activation and performance as SCM, are not well understood or, in some cases, have not been considered. The objective of the current work, therefore, was to study multicomponent clays from metamorphic rocks with low-grade kaolinite (<50%) from a tropical region of Colombia for possible use as SCMs. The clay deposit was identified by geological exploration techniques and classified in depth according to horizons of the weathering profile. The samples were extracted from the first 50 m of the deposit and characterized physically, chemically, and mineralogically; they were calcined at 650, 750, and 850°C; their degree of alteration was estimated by the Chemical Index of Alteration (CIA); and their performance as an SCM was evaluated by the Strength Activity Index (SAI) and Frattini test. As a main result, a relationship was found between the weathering profile of the deposit and the CIA of raw clays, which confirmed the high weathering and degree of alteration of the parent rock in the deposit (weathered rock and residual soil with a CIA > 80%). Furthermore, pozzolanic (physical and chemical) tests demonstrated the potential use of calcined clays from this deposit as SCMs, as well as their thermal activation at low temperature (≤750°C). In addition, the pozzolanic activity increased with the kaolinite/(muscovite+illite+vermiculite) ratio mainly, and, in turn, the thermal activation temperature increased with the mica and type 2:1 clay content.

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Characteristic Investigations on Ethiopian Kaolinite: Effect of Calcination Temperature on Pozzolanic Activity and Specific Surface Area

Kassa

Shibeshi

Tizazu

et al. 2022

Advances in Materials Science and Engineering

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Kaolinite, a clay mineral, is an important industrial mineral which was gainfully utilized with several industrial significances. Towards mineral beneficiation, the present study aimed to investigate the effect of calcination temperature on the pozzolanic activity and specific surface area of Ethiopian kaolinite (Ek). The raw Ek and calcined Ek were characterized using different sophisticated techniques, such as XRD, FTIR, DSC, TGA, dynamic light scattering, electrophoretic light scattering, and SEM analysis. The pozzolanic activity and specific surface area of Ek particles were ascertained using Chapelle’s and Brunauer–Emmett–Teller methods, respectively, with some modifications. The results revealed that the calcination temperature had a great influence on pozzolanic activity and specific surface area of Ek. It was observed that the pozzolanic activity linearly increased with calcination temperature until 700°C and showed a maximal value of 1235 mg Ca(OH)2 g−1. On the other hand, beyond 700oC, the pozzolanic activity was inferred to be declined to 445 mg Ca(OH)2 g−1 at 1000°C due to agglomeration of calcined kaolinite (metakaolinite) and formation of spinel phase. A similar phenomenon was observed for specific surface area which increased with temperature until 700°C to exhibit the maximal values of 47.794 m2·g−1. Further, the investigation on zeta potential analysis showed that the magnitude value of the metakaolinite was observed to be less than the zeta potential value of the raw kaolinite, which indicated that the flocculation tendency of metakaolinite was greater than the kaolinite flocculation affinity in water.

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Cement production with pozzolans from residual tropical soils formed from paragneiss with a high silicon oxide content

Cited by 4 publications

References 18 publications

Property modifications of low‐grade clay through physical treatments and its incidence in the pozzolanic activity

Property modifications of low‐grade clay through physical treatments and its incidence in the pozzolanic activity

Performance of Low-Grade Calcined Clays as Supplementary Cementitious Material in Relation to their Geological Characteristics

Characteristic Investigations on Ethiopian Kaolinite: Effect of Calcination Temperature on Pozzolanic Activity and Specific Surface Area

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