Mechanical activation of diabase and its effect on the properties and microstructure of Portland cement

Korkmaz, Abdul Vahap

doi:10.1016/j.cscm.2021.e00868

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…Strength development is often used to determine the pozzolanic properties of a material by measuring its reaction with lime and forming cementitious products [ 81 ]. The performance index or strength activity is accomplished based on the mechanical compressive strength of mortars with a certain percentage of cement replacement by pozzolanic material as a comparative of a reference mortar to partially evaluate the reactivity according to [ 46 , 67 ].…”

Section: Analysis Of Pozzolanic Activitymentioning

confidence: 99%

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Pinheiro¹,

Alexandre²,

Xavier³

et al. 2023

Materials

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The search for alternative materials to replace ordinary Portland cement has been the object of work that enhances the investigation of the use of pozzolanic materials and the reduction of the carbon footprint with supplementary cementitious materials. However, not all materials are available to meet the large-scale demand for cement replacement. A relevant exception is the calcined clay, a material found worldwide that, when subjected to appropriate heat treatment, presents pozzolanic reactivity and can be used as a supplementary material to cement. This review presents, through a systematic search, methods for measuring the pozzolanic reactivity of calcined clays, namely, direct, indirect, qualitative, quantitative, chemical and physical methods such as electrical conductivity (Lùxan), the force activity index, the modified Chapelle, R3, Frattini test, thermal analysis, X-ray diffraction and X-ray fluorescence spectrometry. The most usual methods to assess the pozzolanic reactivity of calcined clays were exposed and analyzed. It should be pointed out that there is greater use of the Frattini and modified Chapelle methods as well as the analysis of the mechanical strength behavior of the material in cementitious matrices. X-ray diffraction and thermal analysis were exposed as the most used correlation methods but it was also concluded that different tests are needed to generate accurate results.

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Section: Analysis Of Pozzolanic Activitymentioning

confidence: 99%

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Pinheiro¹,

Alexandre²,

Xavier³

et al. 2023

Materials

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“…For example, adding natural pyrophyllite at 10%, 30%, and 50% had diverse effects on the properties of cement paste and mortar. The mechanical properties and hydration properties of cement paste were improved by the mechanical activation of natural pyrophyllite [1]. Mechanical-chemical activation affected the particle size distribution, morphology, and bulk and surface chemical structures of kaolinite and montmorillonite clays.…”

Section: Introductionmentioning

confidence: 99%

Potential Utilization of Loess in Grouting Materials: Effects of Grinding Time and Calcination Temperature

Bai,

Wang,

Zhang

et al. 2024

Minerals

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There is a huge reservation of loess in the Shanxi mining area in China, which has great potential for preparing supplementary cementitious materials. Loess was modified via mechanical and thermal activation, and the pozzolanic activity was evaluated using an Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Moreover, the workability of grouting materials prepared using modified loess was assessed. The experimental results revealed that the number of ultrafine particles gradually increased with the grinding time, enhancing the grouting performance. The coordination number of Al decreased upon the breakage of the Al–O–Si bond post-calcination at 400 °C, 550 °C, 700 °C, and 850 °C. Moreover, the breaking of the Si–O covalent bond produced Si-phases, and the pozzolanic activity of loess increased. Furthermore, the modified loess was hydrated with different cement proportions. With increasing grinding time, the overall setting time increased until the longest time of 14.5 h and the fluidity of the slurry decreased until the lowest fluidity of 9.7 cm. However, the fluidity and setting time decreased with increasing calcination temperature. The lowest values were 12.03 cm and 10.05 h. With the increase in pozzolanic activity, more ettringite was produced via hydration, which enhanced the mechanical properties. The maximum strength of the hydrated loess after grinding for 20 min reached 16.5 MPa. The strength of the hydrated loess calcined at 850 °C reached 21 MPa. These experimental findings provide theoretical support for the practical application of loess in grouting.

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“…Cement production causes significant energy consumption, diminishes natural resources, and increases greenhouse gas emissions (mostly carbon dioxide). Thus, there is an urgent request to confront the environmental and economic challenges of the cement production industry to achieve sustainability aims 1 – 4 . Therefore, in the construction industry, the use of supplementary cementitious materials (SCMs) is an effective tool for achieving sustainability aims 5 – 8 .…”

Section: Introductionmentioning

confidence: 99%

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

Eldahroty

Farghali

Shehata

et al. 2023

Sci Rep

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Rhyolite rocks extend from southern Egypt to northern Egypt in the Eastern Desert, and no effective economic exploitation of them has been discovered so far. The pozzolanic activities of different volcanic tuffs (VT) supplied from the Eastern Desert located in Egypt have been investigated as natural volcanic pozzolan materials to develop new green cementitious materials for achieving sustainability goals in the construction field. Experimentally in this paper, the pozzolanic activities of seven diverse specimens of Egyptian tuffs taken with standardized proportions of 75:25% (Cement: volcanic tuffs) were investigated. Pozzolanic features of such tuffs are examined comparatively via strength activity index (SAI), TGA, DTA, and the Frattini’s test. Chemical composition, petrographic, and XRD analysis were also performed for tuffs samples. The pozzolanic reaction degrees were determined according to the compressive strengths at 7, 28, 60 and 90 days with different replacement ratios (20, 25, 30 and 40%) of tuffs samples. Additionally, the micro-filler effects in mortar and concrete were determined by measuring the heat of hydration in mortar samples and the compressive strength of concrete with different additive ratios for tuffs samples besides, the concrete slump test. The results show that TF6 gives a lower cement heat of hydration value which is less than 270 J/g at 7 days. Also, its performance in concrete is better than silica fume at late strength (28 days) since the concrete index value is 106.2% by compared to the concrete index of silica fume 103.9 and therefore it can be used as an alternative to high price and quality variable silica fume (SF) for producing high-performance green concrete. Due to the good pozzolanic behavior proved by nearly most volcanic tuffs, along with their low cost, this study will be profitable for very auspicious the use of Egyptian volcanic tuffs for developing sustainable and eco‑friendly blended cement.

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Mechanical activation of diabase and its effect on the properties and microstructure of Portland cement

Cited by 9 publications

References 35 publications

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Potential Utilization of Loess in Grouting Materials: Effects of Grinding Time and Calcination Temperature

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

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