Study on Strength and Microstructure of Cement-Based Materials Containing Combination Mineral Admixtures

Abstract

The compressive strength of complex binders containing two or three blended mineral admixtures in terms of glass powder (GP), limestone powder (LP), and steel slag powder (SP) was determined by a battery solution type compressive testing machine. The morphology and microstructure characteristics of complex binder hydration products were also studied by microscopic analysis methods, such as XRD, TG-DTA, and SEM. The mechanical properties of the cement-based materials were analyzed to reveal the most appropriate mineral admixture type and content. The early sample strength development with GP was very slow, but it rapidly grew at later stages. The micro aggregate effect and pozzolanic reaction mutually occurred in the mineral admixture. In the early stage, the micro aggregate effect reduced paste porosity and the small particles connected with the cement hydration products to enhance its strength. In the later stage, the pozzolanic reaction of some components in the complex powder occurred and consumed part of the calcium hydroxide to form C-S-H gel, thus improving the hydration environment. Also, the produced C-S-H gel made the structure more compact, which improved the structure’s strength.

Performance Prediction and Mix Ratio Optimization for Multielement Green High-Performance Fiber-Reinforced Cement Matrix Composite

“…However, the material faces some intrinsic defects, such as a high susceptibility to cracking, and a small tensilecompressive strength ratio. Composite material and fiber addition are necessary means to help cement concrete overcome problems in dry shrinkage, durability, and brittleness [1][2][3][4]. In recent years, a new material called green high-performance fiber-reinforced cement (GHPFRC) matrix composite has emerged, which is prepared by mixing matrix composites like slurry, mortar, or concrete with reinforcing materials like metal or inorganic nonmetal fiber, synthetic fiber, or natural organic fiber by a certain method.…”

Physiochemical characterization of agricultural waste biochars for partial cement replacement

“…More specifically, the influence of wastes on OPC setting and strength development may be attributed to dilution, filler, nucleation and pozzolanic effects (Roy et al, 2017;Zannerni et al, 2020). OPC setting, compression strength and water absorption characteristics may be influenced by the physical and chemical characteristics of replacement materials (Spokas, 2010;Brebu and Vasile, 2010;Chen et al, 2016Chen et al, , 2019Ofori-Boadu et al, 2018a, b;Lootens and Bentz, 2016;Ezziane et al, 2009;Wang et al, 2012;Su, 2005;and Dommerbolt et al, 2016;Khan et al, 2014;Ukrainczyk et al, 2012;Rapp, 1935;Ha et al, 2015;Namdar et al, 2014;Rao et al, 2016;Christopher et al, 2017;Pode, 2016;Lavergne et al, 2019;Pokorny et al, 2016;. Past research on biochar-modified CBMs has focused on the performance characteristics of CBMs, with few researchers investigating the chemical interactions that could influence early-age performance of biochar-modified CBMs (Suarez-Riera et al, 2020;Ofori-Boadu et al, 2018a, b).…”