Effect of silicate modulus and curing regimes on the phase evolution and properties of geopolymers from hydro-beneficiated kaolin waste

Description

This dataset contains the raw and processed experimental data supporting the research article entitled "Synthesis and properties of high-strength geopolymers from hydro-beneficiated kaolin waste" by Stepan A. Podogov and Viktor A. Kutugin. The study investigates the feasibility of synthesizing high-strength geopolymer binders from hydro-beneficiated kaolin waste supplied by JSC "Tugansky Mining and Processing Plant Ilmenit" (Tomsk Region, Russian Federation). The raw kaolin waste was subjected to hydro-beneficiation via wet sieving (<30 μm), followed by thermal activation at 750 °C to produce reactive metakaolin. Geopolymer pastes were synthesized using sodium silicate activators with silicate moduli of M = 1.3, 1.7, and 2.1, and cured at 20 °C, 50 °C, and 80 °C. The dataset includes the following files: XRF_data.xlsx – Chemical composition (wt.%) of the initial kaolin waste (KW), metakaolin concentrate (MC), and sand tailings (ST), determined by X-ray fluorescence spectroscopy (HITACHI X-Supreme 8000). XRD_raw_materials.xlsx – X-ray diffraction patterns of the kaolin concentrate (KC), metakaolin concentrate (MC), and sand tailings (ST), recorded on a Shimadzu XRD-7000S diffractometer. XRD_GP_01_03_07_28.xlsx – X-ray diffraction patterns of GP-1.7 geopolymer specimens cured under ambient conditions (20 °C) for 1, 3, 7, and 28 days. DSC_TGA_KC/ST.csv – Simultaneous DSC/TGA curves for the kaolin concentrate (KC) and sand tailings (ST), recorded on a NETZSCH STA 449 F3 thermal analyzer (heating rate 10 °C/min, 40–1000 °C). Compressive_strength.xlsx – Compressive strength values (MPa) with standard deviations for all geopolymer formulations (GP-1.3, GP-1.7, GP-2.1) at 3, 7, and 28 days under different curing temperatures (20 °C, 50 °C, 80 °C), measured on a PGM-100MG4 hydraulic testing machine (20 × 20 × 20 mm cubic specimens, n = 3). Methodology notes: Hydro-beneficiation was performed using a vibrating screen with a 30-μm mesh size. Thermal activation: 750 °C for 1 h, heating rate 3 °C/min. Phase identification was performed using Crystallographica Search-Match software with the ICDD PDF-2 database. Compressive strength values represent the arithmetic mean of three parallel tests.

Institutions

• Tomsk Polytechnic University

  Tomsk Oblast, Tomsk

Categories

Licence