Crushing the glass to sand consistency would produce 2 disadvantages.
1. Bear in mind that there is almost no bonding from papercrete to glass. Now, crushing glass more increases its surface area, and thus the amount of debonding within the mix, which would weaken its tensile strength more.
(I had expected the oposite, that the cement content would bond well ot the glass, and hoped the low level of cement might mean at the higher ph than concrete the cement and glass would not react over time and debond.)
2. It requires more work/time/energy
NT
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