Understanding the effects of hematite and brucite additions on fresh- and hardened-state properties of metakaolin-based geopolymer cements
Source abstract
Abstract
The effects of hematite and brucite additions on fresh- and hardened-state properties of metakaolin-based geopolymer were investigated. Metakaolin-based geopolymer was produced with three Si/Al molar ratios and supplemented with hematite or brucite using three Fe/Al and Mg/Al molar ratios. Rheology, setting time, permeable porosity, compressive strength, and resistance to sulfuric acid of metakaolin-based geopolymer were measured. Experimental results show that, at Si/Al = 1.75 and 2.0, the hematite addition reduced the setting time whereas the brucite addition prolonged setting times, indicating an accelerated and delayed alkali-activation process of metakaolin-based geopolymers, respectively. At Si/Al = 1.5, both additions accelerated the setting time but increased the permeable porosity. Both additions reduced the bulk mechanical properties but improved sulfuric acid resistance. Pastes with brucite exhibited better sulfuric acid resistance than the counterpart with hematite. The paste immediately surrounding the agglomerates of hematite and brucite particles exhibited lower and higher micromechanical properties, respectively.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Magnesium Oxide Properties and Applications · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
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