Abstract
This research focuses on the mechanical and microstructure properties of geopolymer binder with slatestone waste as the base material. This geopolymer binder comes from industrial waste crushing slate in the Umeanyar area. This waste is processed into stone powder (USSP) which contains SiO<sub>2</sub> (49%), Al<sub>2</sub>O<sub>3</sub> (11%), CaO (11.2%). This USSP uses a sodium hydroxide (SS) activator with a concentration of 14 M. The proportion of the mixture of precursor and activator (P/A) is 70%: 30%; 75%: 25%; 80%: 20% and alkaline activator Na<sub>2</sub>SiO<sub>3</sub>: NaOH (SS/SH) of 1:1; 1.5:1; 2:1, by weight. Samples of specimens were made in the form of a cube with a side of 50 mm and tested at the age of 7 and 28 days. Mechanical properties tested include density and compressive strength based on ASTM-C39. Meanwhile, the microstructural analysis used X-Ray Diffraction (XRD) and Scanning Electronic Microscope-Energy Dispersive X-Ray (SEM-EDX) analysis. The results of the density test were 1.90g/cm<sup>3</sup> and 1.85g/cm<sup>3</sup> respectively and the compressive strength test results were 7.40 MPa and 12.73 MPa at the age of 7 and 28 days, respectively.
Highlights
Concrete is one of the materials needed in the construction sector
The world's cement production has been recorded at 4 billion tons per year, which means about 4 billion tons of CO2 gas has been released into the atmosphere every year [9,10]
The criteria for selecting the proportion of geopolymer binder are based on several studies that have been carried out previously which resulted in high compressive strength
Summary
Concrete is one of the materials needed in the construction sector. The constituent materials of concrete generally consist of cement, aggregate, and water, if necessary there are materials added to change certain properties of the concrete [1]. Research on the use of fly ash as a precursor containing more than 50% silica and alumina activated with an activator solution can to produce compressive strength exceeding conventional cement [18,19,20,21,22]. In the manufacture of geopolymers, many factors affect the characteristics of the resulting geopolymer both mechanically, physically, and microstructured, including raw materials or precursors, calcination temperature/thermal treatment, particle size, activating solution/activator, and the treatment process [12, 24,25,26,27,28]. In addition to mechanical properties in the form of compressive strength and volume weight tests, this study will discuss the microstructure of geopolymer binders based on Umeanyar slatestone powder. Microstructural tests were carried out using X-RD (X-Ray Diffraction) and SEM (Scanning Electronic Microscope)
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