Basic oxygen furnace (BOF) slag cementitious binder activated by Na4EDTA

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-07-11 DOI:10.1016/j.cemconres.2025.107983

Zhihan Jiang , Xuan Ling , Quan Liu , Helong Song , Katrin Schollbach , H.J.H. Brouwers

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引用次数: 0

Abstract

Basic oxygen furnace (BOF) slag contains two potentially hydraulically reactive phases, belite (C₂S) and brownmillerite (C₂(A,F)), yet exhibits low reactivity. This study proposes ethylenediaminetetraacetic acid tetrasodium salt (Na₄EDTA) as a hydration activator and investigates its effects on BOF slag phase evolution, early hydration kinetics, microstructural development, mechanical properties, and leaching behaviors. The EDTA⁴⁻ chelation mechanism in the BOF slag system is also discussed. Results show that Na₄EDTA significantly enhances BOF slag hydration, producing a stand-alone binder with high compressive strength (38.8 MPa at 28 d, v.s. 8.6 MPa of the reference) and reduced porosity. At 4.8 wt% Na₄EDTA, brownmillerite reacts almost completely within one day. Belite hydration is also enhanced, particularly at early ages. The main hydration products are hydrogarnet and C-S-H gel. EDTA itself is likely partially incorporated into the layered double hydroxides (LDHs) structure of hydrotalcite. Heavy metal leaching is below the Dutch legal limits.

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Na4EDTA活化的碱性氧炉炉渣胶凝粘结剂

碱性氧炉（BOF）炉渣含有两种潜在的水力反应相：白橄榄石（C2S）和褐磨矿（C2(A，F)），但反应活性较低。本研究提出乙二胺四乙酸四钠盐（Na4EDTA）作为水化活化剂，并研究其对转炉炉渣相演化、早期水化动力学、微观结构发育、力学性能和浸出行为的影响。讨论了转炉炉渣体系中EDTA4−的螯合机理。结果表明，Na4EDTA显著增强了转炉炉渣的水化作用，产生了高抗压强度（28 d时为38.8 MPa，而参考值为8.6 MPa）和低孔隙率的独立粘结剂。当Na4EDTA浓度为4.8 wt%时，褐粒石几乎在一天内完全反应。贝利特水合作用也得到加强，尤其是在幼年时期。主要水化产物为水石榴石和C-S-H凝胶。EDTA本身可能部分地结合到水滑石的层状双氢氧化物（LDHs）结构中。重金属浸出低于荷兰的法定上限。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.