Barely Significant

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With the increase in shot peening time, the surface hardness of the 7075 aluminium alloy showed a trend of increasing and then decreasing, but the hardness did not increase continuously with the increase in shot peening time [ 32 ], indicating that the shot peening time has a limited effect on the thickness of the hardened layer.
From Figure 20 , it can be seen that at F25, the compressive strength of PCE-S8 and PCE-W8 composite cementitious mortars both show an increasing trend, indicating that the cementitious mortars with a larger amount of mineral admixtures continue to undergo further hydration reactions after 28 days of curing, thereby increasing the mechanical strength.
It can be observed through Figure 8 a that the maximum stress of drainage asphalt mixtures prepared by rubber powder-modified asphalt at low temperatures shows a decreasing and then an increasing trend as the temperature rises, and the compressive strength is the largest at −15 °C, with an average compressive up to 3.44 kN, the smallest compression strength at −10 °C, and the minimum stress of 2.36 kN.