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Updated: Jan 7, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

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硫酸盐攻击和重金属属性的演变 烧结 改性焚烧 灰 飞 砂

Xiaodong Ma1, Jialong Guo1, Xianjun Li1

  • 1School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030031, China.

Langmuir : the ACS journal of surfaces and colloids
|December 26, 2025
PubMed
概括

在水泥中的焚烧飞灰显示出各种各样的硫酸盐抗性. 化飞灰 (C-IFA) 砂表现不佳,而未化 (U-IFA) 和直接化 (D-IFA) 则表现出更好的重金属固定性和硫酸盐耐受性.

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Sulfate Attack on Concrete

Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
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Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
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