As for increases in density, the 1400 kg/m 3 EPS concrete still shows an increasing trend because the smallest amount of EPS particles was added, and the defects are relatively small.
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Influence of Paste Strength on the Strength of Expanded Polystyrene (EPS) Concrete with Different Densities.
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The sentences
The positive and negative coefficients only indicate the change rule for x or y and do not indicate that x or y shows a decreasing trend relative to z.