Durability enhancement mechanism of mortar using blast furnace slag fine aggregate against combined deterioration of frost and salt damage

The quality of aggregates used in plastering mortar contributes to its quality. This work evaluates the suitability of two grades of sand, sharp sand collected along active/old river courses and plastering sand collected from burrow pits, as plastering materials. X-ray diffraction and X-ray fluorescence analysis were used to access their mineralogy, major, minor, and trace element components. Grain size distribution analysis, natural moisture content, specific gravity, Atterberg limits, matric suction and permeability tests were also carried out on the sand samples. In both sands, silica (SiO2) content was more than 80%. The plastering sand exists at a higher natural moisture content than the sharp sand. The fines modulus ranges from 1.79 to 2.06 and 0.76 to 1.44, respectively, in sharp sand and plastering sand. The permeability coefficients and matric suction of sharp sand are larger than those of plastering sand. This implies that sharp sand will allow easier water passage through its pore spaces, therefore tending to exist in a dryer state than plastering sand. Sharp sand may be suitable for plastering because the test results are within the acceptable limits for good plastering materials according to national and international standards for good plastering sand.

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Freeze-thaw Resistance of Concrete using Ground Granulated Blast-furnace Slag and Blast-furnace Slag Sand in Salt Water

Ayano,

Fujii,

Okazaki

2024

ACT

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The freeze-thaw resistance of concrete is significantly lower in salt water than in fresh water. Concrete deteriorates through repeated freezing and thawing, but in salt water, freezing alone leads to destruction. This paper investigated the effect of calcium hydroxide in concrete on the failure of concrete under such low temperatures. Calcium hydroxide precipitates at the transition zone between aggregate and cement paste due to the hydration of cement. The lower the temperature and the higher the concentration of salt water, the more calcium hydroxide dissolves. From concrete, more calcium hydroxide is eluted in salt water than in fresh water. This accelerates the deterioration of mortar and concrete due to freeze-thaw action. Mortar and concrete using ground granulated blast-furnace slag produces less calcium hydroxide. In mortar and concrete using blast-furnace slag sand, calcium hydroxide precipitated around the aggregate reacts with cement paste and blast-furnace slag sand to modify the transition zone. From these results, it was clarified that concrete using blast-furnace slag exhibits high freeze-thaw resistance even in salt water. This paper is the English translation of the authors' previous work [Ayano, T., Fujii, T. and Okazaki, K., (2023). "Freezethaw resistance of concrete using ground granulated blast-furnace and blast-furnace slag sand in salt water." Japanese Journal of JSCE, 79(12),[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]].

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Durability enhancement mechanism of mortar using blast furnace slag fine aggregate against combined deterioration of frost and salt damage

Cited by 3 publications

References 22 publications

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Mechanical and durability properties of polymer fiber reinforced one-part foam geopolymer concrete: A sustainable strategy for the recycling of waste steel slag aggregate and fly ash

Geological and geotechnical assessment of natural sands in Ilorin, Nigeria

Freeze-thaw Resistance of Concrete using Ground Granulated Blast-furnace Slag and Blast-furnace Slag Sand in Salt Water

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