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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Dosage of Fly Ash and NaOH on Properties of Pisha Sandstone-Based Mortar
Author(s): Changming Li, Tingting Zhang, and Lijiu Wang
Publication: Materials Journal
Appears on pages(s): 173-183
Keywords: compressive strength; microstructure; Pisha sandstone-based mortar; pore structure; water permeability
Abstract:This paper investigates the effectiveness of NaOH concentration and fly ash dosage on the mechanical properties, pore structure, water resistance, and water permeability of a new mortar manufactured by using a special kind of sandstone and fly ash. Mechanical properties were evaluated by means of compressive strength. Mercury intrusion porosimetry (MIP) was employed to investigate the pore structure and pore size distribution. A water permeability test was carried out to find out the permeation characteristics of Pisha sandstone-based mortar. Thermogravity and differential scanning calorimetry (TG-DSC), Fourier transform infrared (FTIR) analysis, and scanning electron microscopy (SEM) were used to analyze the reaction products, indentify the phases of the reaction products, and observe the morphology, respectively. Test results revealed that NaOH concentration and fly ash dosage had significant effects on the mechanical properties, pore structure, and water permeability of Pisha sandstone-based mortar. The specimen (NaOH concentration 3.1 mol/L, fly ash wt.15%) exhibited the highest compressive strength (19.32 MPa [2801 psi]), water resistence (0.76) and lowest water permeability value (5.1 × 10–8 m/s [16.73 × 10–8 ft/s]) at 90 days.
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