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A platform for research: civil engineering, architecture and urbanism
Method for preparing roadbed water stabilizing layer from solid waste phosphogypsum, aluminum ash and steel slag
The invention discloses a method for preparing a roadbed water-stable layer from solid waste phosphogypsum, aluminum ash and steel slag, which comprises the following steps: mixing fine powder formed by grinding and modifying phosphogypsum modified by vacuum heating, aluminum ash modified by high-temperature calcination and steel slag with cement to form a solid waste-based composite cementing material; and mixing with mixed aggregate formed in a specific steel slag-gravel particle size range and proportion to prepare the roadbed water-stable layer. The method has the advantages that soluble HPO4 < 2->, H2PO4 <-> and F <-> in the phosphogypsum and Al, AlN, NaCl and KF in the aluminum ash can be effectively removed or separated, the environmental pollution risk and the hydration negative effect are eliminated, and the use of cement and natural gravel can be reduced on a large scale; synergistic resource utilization of the steel slag, the aluminum ash and the ardealite in the roadbed water-stable layer is achieved, and the solid waste utilization rate is high. The unmeasured compressive strength is higher than that of the full-Portland cement stabilized steel slag-gravel blended aggregate; the strength of the water-stable layer is enhanced by generating more hydrated calcium aluminate (C-A-H) crystals with fibrous morphology and long columnar ettringite (AFt).
本发明公开了一种固废磷石膏、铝灰、钢渣制备路基水稳层的方法，以真空加热改性的磷石膏、高温煅烧改性的铝灰、钢渣研磨改性成的细粉及水泥混合形成固废基复合胶凝材料，然后与特定钢渣‑碎石粒径范围和比例形成混配骨料混合制备路基水稳层。本发明的优点：磷石膏中的可溶HPO42‑、H2PO4‑、F‑以及铝灰中Al、AlN、NaCl、KF都能得到有效去除或分离，消除环境污染风险和水化负作用，可大规模减少水泥和天然碎石的使用；实现了钢渣、铝灰、磷石膏在路基水稳层的协同资源化利用，固废利用率高；无测限抗压强度高于全硅酸盐水泥稳定钢渣‑碎石互配骨料；通过更多的生成纤维状形貌水化铝酸钙(C‑A‑H)晶体和长柱状的钙矾石(AFt)来增强水稳层强度。
Method for preparing roadbed water stabilizing layer from solid waste phosphogypsum, aluminum ash and steel slag
The invention discloses a method for preparing a roadbed water-stable layer from solid waste phosphogypsum, aluminum ash and steel slag, which comprises the following steps: mixing fine powder formed by grinding and modifying phosphogypsum modified by vacuum heating, aluminum ash modified by high-temperature calcination and steel slag with cement to form a solid waste-based composite cementing material; and mixing with mixed aggregate formed in a specific steel slag-gravel particle size range and proportion to prepare the roadbed water-stable layer. The method has the advantages that soluble HPO4 < 2->, H2PO4 <-> and F <-> in the phosphogypsum and Al, AlN, NaCl and KF in the aluminum ash can be effectively removed or separated, the environmental pollution risk and the hydration negative effect are eliminated, and the use of cement and natural gravel can be reduced on a large scale; synergistic resource utilization of the steel slag, the aluminum ash and the ardealite in the roadbed water-stable layer is achieved, and the solid waste utilization rate is high. The unmeasured compressive strength is higher than that of the full-Portland cement stabilized steel slag-gravel blended aggregate; the strength of the water-stable layer is enhanced by generating more hydrated calcium aluminate (C-A-H) crystals with fibrous morphology and long columnar ettringite (AFt).
本发明公开了一种固废磷石膏、铝灰、钢渣制备路基水稳层的方法，以真空加热改性的磷石膏、高温煅烧改性的铝灰、钢渣研磨改性成的细粉及水泥混合形成固废基复合胶凝材料，然后与特定钢渣‑碎石粒径范围和比例形成混配骨料混合制备路基水稳层。本发明的优点：磷石膏中的可溶HPO42‑、H2PO4‑、F‑以及铝灰中Al、AlN、NaCl、KF都能得到有效去除或分离，消除环境污染风险和水化负作用，可大规模减少水泥和天然碎石的使用；实现了钢渣、铝灰、磷石膏在路基水稳层的协同资源化利用，固废利用率高；无测限抗压强度高于全硅酸盐水泥稳定钢渣‑碎石互配骨料；通过更多的生成纤维状形貌水化铝酸钙(C‑A‑H)晶体和长柱状的钙矾石(AFt)来增强水稳层强度。
Method for preparing roadbed water stabilizing layer from solid waste phosphogypsum, aluminum ash and steel slag
一种固废磷石膏、铝灰、钢渣制备路基水稳层的方法
QING SANCHENG (author) / WANG XIN (author) / WANG YONGGUANG (author) / XUE GUANGHAI (author) / WAN YONGBO (author) / QU YINGFENG (author) / LU YI (author) / PAN SHEWEI (author) / LI QIANG (author) / WU MENG (author)
2024-05-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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