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Recycled sand from sandstone waste: A new source of high-quality fine aggregate by Yubin Cao; Yanru Wang; Zuhua Zhang; Hao Wang is a Environmental Science article available to read on EtoBox.

What is Recycled sand from sandstone waste: A new source of high-quality fine aggregate about?

The construction industry is facing a shortage issue of river sand, therefore broadening new sources of fine aggregate is imminent. This paper demonstrates the feasibility of a recycled sand from sandstone waste in mortar manufacturing by comprehensive assessment of workability, mechanical properties, water absorption, alkali silica reaction (ASR). The recycled sandstone sand (S-sand) has a smoother microscopic morphology and better particle size distribution than river sand (R-sand). Fine particles smaller than 150 μm in R-sand usually contain a large amount of impurities (such as clay) and are considered harmful. However, the S-sand containing ~15.7% μm quartz grains <150 μm significantly improves the mortar performance in terms of compressive strength and ASR property. At the same water to binder ratio, the mortar using the S-sand shows worse workability than that using R-sand but a slight increase of water to binder ratio or adding water reducer improves not only the workability but also mechanical properties. For the ASR test, the S-sand shows potential uncertain risk as per ASTM C 1260. Using calcined clay or fly ash to replace 25% cement can effectively inhibit expansion ris

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Author

Yubin Cao; Yanru Wang; Zuhua Zhang; Hao Wang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)