Abstract
This article presents the results of research on the effect of plasticisers made based on four different compounds—melamine (M), naphthalene (NF), acrylic polymers (AP) and polycarboxylic ethers (PC)—added to the tested mixes in the amount of 2% of the fly ash (FA). The influence of superplasticisers (SPs) on the consistency of the fresh concrete was investigated using a flow table and a penetrometer, and the air voids content was determined by means of a porosimeter. Additionally, the influence of plasticisers on the viscosity of the paste was investigated using a rheometer. Hardened mortar that matured under two different conditions was also tested at elevated and room temperatures. The tested properties were 7-, 28- and 90-days compressive strength and internal microstructure viewed under a microscope. NF had the greatest viscosity-reducing effect while it increased the air void volume in the mix at the same time. The highest early and late strengths were obtained after curing in elevated temperature samples with an acrylic-polymer-based superplasticiser. However, the increased curing temperature of the samples only influenced the early strength results. Its effect was not visible after 90 days. The AP addition also had a significant impact on improving the consistency of the mixture. The addition of plasticisers did not affect the microstructure of the specimens.
Highlights
In the era of increasing demand for cement, we have reached the point where there are shortages of this product on the market
None of them are comprehensive enough to define the influence of plasticisers on the consistency and viscosity, as well as the short- and long-term strength of the material depending on the curing conditions
This being so, this article presents the results of laboratory tests on the influence of the four types of plasticisers on the consistency and viscosity of the geopolymer paste and on the 7, 28- and 90-day strength of the specimens of mortar maturing both at room temperature and heated after moulding for 24 h at the temperature of 70 ◦ C
Summary
In the era of increasing demand for cement, we have reached the point where there are shortages of this product on the market. Study [23] gives the results of research regarding one-component geopolymeric concrete It was prepared by mixing the dry ingredients, including FA, GGBFS and various types of powdered sodium silicate, and adding water and other liquid additives. None of them are comprehensive enough to define the influence of plasticisers on the consistency and viscosity, as well as the short- and long-term strength of the material depending on the curing conditions This being so, this article presents the results of laboratory tests on the influence of the four types of plasticisers on the consistency and viscosity of the geopolymer paste and on the 7-, 28- and 90-day strength of the specimens of mortar maturing both at room temperature and heated after moulding for 24 h at the temperature of 70 ◦ C
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