|Table of Contents|

Study on performance of lime-activated slag-steel slag cementitious system regulated by sodium sulfate(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年02期
Page:
122-130
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on performance of lime-activated slag-steel slag cementitious system regulated by sodium sulfate
Author(s):
WANG Ying1;  GU Xiaowei1;  LIU Jianping2;  XU Xiaochuan1;  WANG Qing1
(1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Architecture & Civil Engineering, Shenyang University of Technology, Shenyang 110027, Liaoning, China)
Keywords:
sodium sulfate;  lime-slag-slag-steel cementitious system;  compressive strength;  working performance;  hydration reaction mechanism
PACS:
TU526
DOI:
10.19815/j.jace.2023.02078
Abstract:
In order to solve the problem of poor working performance and low early strength of the lime-activated slag-steel slag cementitious system, the slag-steel slag cementitious system was activated with a composite exciter composed of lime to sodium sulfate with the molar ratio of 1:1. The similarities and differences of compressive strength and workability of slag-steel slag cementitious system under two activators of lime and lime-sodium sulfate were compared and analyzed. X-ray diffraction(XRD)and other testing methods were employed to investigate the influence of sodium sulfate on the hydration characteristics of the lime-slag-steel slag cementitious system. The results show that the 3 d and 28 d compressive strengths of the lime-sodium sulfate activated slag-steel slag cementitious system with a water-binder ratio of 0.4 and a molar ratio of 1:1 are 28.7 MPa and 36.5 MPa respectively, which are 155.3% and 14.8% higher than those of lime-activated slag-steel slag cementitious system. The fluidity of the fresh slurry can be increased by 44.2%. The addition of sodium sulfate can shorten the setting time of lime-slag-steel slag cementitious system. The hydration products of lime-slag-steel slag cementitious system are mainly C—(A)—S—H gel, calcite, hydrated calcium aluminate and Ca(OH)2. With the addition of sodium sulfate, the S—O vibration band is increased in the Fourier infrared spectroscopy of the cementitious system, and the amount of hydrated calcium aluminate production decreases and transforms to calcium alumina. The hydration products in the cementitious system are significantly increased and interlocked with each other to fill the pores of the stone body and make the inside of the stone body denser, thus improving the compressive strength of the slag-steel slag cementitious system. The research findings can provide a reference for the preparation of new low carbon cementitious materials and the resource utilization of steel slag.

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Last Update: 2025-03-20