Publication: Properties and performance of geopolymer mortar containing calcined palygoriskite, silica fume and styrene butadiene rubber latex.
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Date
2025-02
Authors
Samer Hamid, Malik
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Abstract
The aim of the research is to produce alkaline activated mortars (GMs) utilizing calcined palygoriskite (HRP), silica fume (SF), and styrene butadiene
rubber latex (SBRL) as aluminosilicate source materials. The compressive strength (CS) and durability, together with mineral and microstructural characterization, were used to evaluate the performance of these mortars. The research consisted of five different phases. The first phase: Synthesizing of HRP-based geopolymer mortar using palygoriskite calcined at different temperatures 550, 650, 700, and 750 °C, respectively. The optimum calcination temperature was 700°C, as the palygoriskite calcined at this temperature produced the maximum compressive strength of 25.1 MPa after 28 days of ambient curing. The second phase: Investigating the optimum single-source binder materials (HRP and MSF) using the Taguchi design method depends on four factors: modulus of silica (Ms), alkaline activator to binder material ratio, Na2SiO3/NaOH, and NaOH concentration. Regarding the intention of obtaining the optimum mixture with the highest possible compressive strength at 3, 7, 14, and 28 days. The optimum modulus of silica (Ms), Na2SiO3/NaOH, alkaline activator to binder material ratio, and NaOH concentration were 3.3, 2.5, 0.85, and 10M, respectively. The optimum mixtures of HRP and MSF recorded 25.2 MPa and 50.8 MPa respectively. The third phase: Investigation of the optimum proportions of GM using binary blends of binder materials HRP and MSF. The alkaline activated binary mixtures (GMs) containing 30% HRP and 70% MSF shows the highest CS (60.3 MPa) after 28 days of ambient curing. The fourth phase: Investigate the influence of SBR-latex on the single and binary blended (HRP and MSF)-based GM. The mix of binary blends modified with SBRL (BML) provided superior performance. The durability performance of single, binary, and latex-based GM under aggressive solutions and high temperature exposures was examined in phase five. The mixtures of BM and BML showed superior resistance to deterioration and durability characteristics when subjected to sulfate and acid solutions, as well as high temperatures (up to 1000 °C). The new phases of wollastonite and nepheline appeared after being exposed to 1000 °C.