Fresh and hardened state properties, reaction kinetics and microstructure of sodium sulfate/sodium hydroxide - Activated slag mixtures

被引：14

作者：

Dai, Xiaodi ^{[1
,2
]}

Aydin, Serdar ^{[3
]}

Yardimci, Mert Yucel ^{[1
,4
]}

De Schutter, Geert ^{[1
]}

机构：

[1] Univ Ghent, Dept Struct Engn & Bldg Mat, Magnel Vandepitte Lab, B-9052 Ghent, Belgium

[2] Univ Calif Los Angeles, Dept Civil & Environm Engn, Lab Chem Construct Mat LC2, Los Angeles, CA 90095 USA

[3] Dokuz Eylul Univ, Dept Civil Engn, TR-35160 Izmir, Turkiye

[4] Istanbul Okan Univ, Dept Civil Engn, TR-34959 Istanbul, Turkiye

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 401卷

关键词：

Alkali -activated cements; Sodium sulfate; Ground granulated blast furnace slag; Rheology; Microstructure; BLAST-FURNACE SLAG; A-S-H; PORE SOLUTION; RHEOLOGICAL MODELS; PHASE EVOLUTION; CEMENT; HYDRATION; IMMOBILIZATION; GEOPOLYMERS; CARBONATION;

D O I：

10.1016/j.conbuildmat.2023.132943

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study investigated the impact of incorporating sodium hydroxide (NaOH) on the properties of ground granulated blast furnace slag (GGBFS) activated by sodium sulfate (Na2SO4). Specifically, the rheological properties, setting behavior, reaction kinetics, mechanical performance, and microstructure of the mixtures were examined. Results indicated that using only Na2SO4 as the activator resulted in mixtures with long setting times and no compressive strength at early ages. However, the addition of NaOH to the Na2SO4 activator significantly improved the reaction kinetics of the GGBFS. By optimizing ratio between NaOH and Na2SO4, mixtures with improved workability, faster structuration, reasonable setting times, and desirable mechanical properties were achieved. The superior mechanical properties were attributed to a well-packed microstructure consisting of C -(A)-S-H, ettringite, and hydrotalcite in the binary NaOH-Na2SO4 activator systems.

引用

页数：16

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