Experimental Study on Sodium Sulfate Exciting Steel Slag Fine in Muddy Soil

Conference paper

Abstract

Steel slag is a kind of solid waste generated in iron and steel smelting. It has the potential cementitious characteristics when the steel slag has been milled to the steel slag fine. The steel slag fine (SSF) is mainly composed of silicate phase. It is very useful to improve muddy properties by mixing with cement and SSF. So by this way, the steel slag not only can be fully utilized and avoid polluting the environment but also can save resources by replacing part of the cement. However, the low activity levels of SSF make it difficult to increase its early strength. In this paper, the chemical excitations method was used. As a stimulant, Na2SO4 is mixed into SSF to stimulate its activity, making the early strength to meet the engineering requirements. Unconfined compressive strength (UCS) test and x-ray diffraction (XRD) test have been used to analyze the effects. The results show that the strength of cement-soil is greatly improved after the addition of Na2SO4 reagent. When cured for 7 days, the strength of SSF-cement soil with Na2SO4 has reached basically at the strength of that without Na2SO4 in 28 days. It indicates that the incorporation of Na2SO4 has an obvious improvement on the early strength. The materials are analyzed by XRD test, and it is found that the addition of activator has the function to promote the hydration process of SSF - cement and to promote the formation of hydration products such as Ca(OH)2 and CaSO4.

Keywords

Sodium sulfate Steel slag fine Unconfined compressive strength X-ray diffraction test 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and MitigationShandong University of Science and TechnologyQingdaoChina
  2. 2.School of Civil Engineering and ArchitectureShandong University of Science and TechnologyQingdaoChina

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