The utilization of phosphorus slag (PHS) to replace the fly ash in the construction of hydraulic projects has attracted a growing attention in China. In this study, the influence of PHS fineness and content on cement hydration, mechanical strength, permeability as well as the pore structure and fractal dimension (Ds) of concrete have been discussed. The results indicate that the PHS addition retards the cement hydration and hence decreases the hydration heat within three days. The incorporation of PHS with a Blaine specific surface area of 505m²/kg could participate in the early pozzolanic reaction and consequently offsets the retarding effect to some extent. The incorporation of 20–40wt.% PHS declines the early strength of concrete, but this reduction effect on strength can be eliminated to some degrees by mechanically grinding the PHS. The compressive strengths of concrete added with PHS with a high fineness of 505m²/kg (abbreviated as PHS-H) are about 16.0–20.6% higher at three days and 8.9–11.0% higher at 180 days compared that of the control concrete. The contribution of PHS-H to the pore structure refinement is more significant than that of PHS with a low fineness of 302m²/kg (abbreviated as PHS-L) at various ages because PHS-H is of much higher reactivity and can consume more Ca(OH)₂ than PHS-L which leads to a denser microstructure and a lower chloride diffusion coefficient (DRCM). The incorporation of PHS decreases the Ds at three days, whereas the concrete incorporated with PHS has much higher Ds than that of control one at late age. The DRCM value increases with increasing the porosity and the most probable aperture, while Ds has a more significant effect on DRCM than the porosity and the most probable aperture. The concrete added with 20wt.% PHS-H exhibits the highest Ds and the lowest DRCM value at long-term age among the five concrete mixtures in this work.

中文翻译：

---

磷渣细度及含量对混凝土水化、渗透性、孔结构及分形维数的影响

在水利工程建设中利用磷渣（PHS）代替粉煤灰在国内引起了越来越多的关注。本研究探讨了 PHS 细度和含量对水泥水化、力学强度、渗透率以及孔隙结构和分形维数的影响。Ds)具体的已经讨论过了。结果表明，PHS 的添加延缓了水泥水化，因此在三天内降低了水化热。加入具有 505 布莱恩比表面积的 PHSm ² /kg 可参与早期火山灰反应，从而在一定程度上抵消缓凝作用。20-40 的合并wt.% PHS 会降低混凝土的早期强度，但这种降低强度的影响可以通过机械研磨 PHS 在一定程度上消除。添加PHS的505高细度混凝土的抗压强度与对照混凝土相比， m ² /kg（缩写为 PHS-H）在 3 天时高出约 16.0-20.6%，在 180 天时高出 8.9-11.0%。PHS-H对孔结构细化的贡献比细度为302的PHS更显着m ² /kg（缩写为 PHS-L）在不同年龄，因为 PHS-H 具有更高的反应性并且可以比 PHS-L 消耗更多的 Ca(OH) ₂，从而导致更致密的微观结构和更低的氯化物扩散系数（DRCM). PHS 的加入降低了Ds三天，而加入 PHS 的混凝土具有更高的Ds比晚年的对照。这DRCM值随着孔隙率和最可能孔径的增加而增加，而Ds有更显着的影响DRCM比孔隙率和最可能孔径。混凝土加20wt.% PHS-H 表现出最高的Ds和最低的DRCM在这项工作的五种混凝土混合物中的长期年龄值。