DOI: 10.18150/0ixnbj
title: Research data for: Initial characteristics of Alkali–Silica Reaction products in mortar containing low-purity calcined clay

description: This set contains data presented in the paper "Initial characteristics of Alkali–Silica Reaction products in mortar containing low-purity calcined clay", Materials, Vol. 17, 2207-1-15, 2024. https://doi.org/10.3390/ma17102207This study investigates the properties and behaviour of ASR products in mortar with the addition of low-purity calcined clay as an additional material. This study includes an evaluation of the expansion and microstructural characteristics of the mortar, as well as an analysis of the formation and behaviour of ASR products with different contents of calcined clay. Expansion tests of the mortar beam specimens were conducted according to ASTM C1567, and a detailed microscopic analysis of the reaction products was performed. Additionally, their mechanical properties were determined using nanoindentation. This study reveals that with an increasing calcined clay content, the amount of the crystalline form of the ASR gel decreases, while the nanohardness increases. The Young’s modulus of the amorphous ASR products ranged from 5 to 12 GPa, while the nanohardness ranged from 0.41 to 0.67 GPa.The data set includes:- The results of the expansion of mortar with granite aggregate according to the ASTM C 1567 method. Expansion results of mortar bars in ASTM C 1567 (alkali-silica reactivity test). Tests were performed in 1M NaOH at 80C. To prevent ASR, 10, 20 and 30% replacement of cement with clay calcined at 850 C was used. Measurements of expansion were performed on dilatometer design in IPPT PAN (patent WUP 08/2022). Measurements were made on 3 samples, the result is their average.- Scanning Electron Microscop (SEM) images of microstructure of mortar with reactive (granite) aggregate after ASTM C1567 tests. The photos document ASR products found in reference mortars and those with the addition of calcined clay. Microscopic observations were performed on a JEOL JSM-6460LV scanning electron microscope (SEM) operated with acceleration voltage set to 15 kV and a working distance of 10 mm. Preparation of samples for observation in SEM included cutting, drying for 3 days at 50C, impregnating with epoxy resin, and then grinding and polishing using diamond pastes with a gradation of 9, 6, 3, 1, 0.25 um.- Results of nanoindentation test of ASR products in aggreagtes and air voids. The study aimed to examine the mechanical properties of ASR products. A maximum force of 10 mN was applied. The loading and unloading processes were executed at a rate of 0.2 mN/s. Following the attainment of maximum force, the indenter was held for 5 s. Alemnis indentation tester equipped with a diamond Berkovich tip was used and observation was performed within Zeiss Crossbeam 350 scanning electron microscope.- Images from petrographic analysis of granite aggregate performed on polarizing microscope Olympus BX51 equipped 32 with a digital colour camera and an automatic stage Prior ES11BX/B, transmitted light with plain polarizers (PPL) and transmitted light with crossed polarizers (XPL). Petrographic analysis was performed to identify reactive minerals in the aggregate.