Properties of Cement-Based Grouts with High Amounts of Ground Granulated Blast-Furnace Slag and Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 11
Abstract
A substantial amount of portland cement (PC) is required in grouting practice for soils and rocks. These grouting applications are relatively new areas in which PC could be substituted by high amounts of granulated blast furnace slag (GGBFS) and fly ash (FA) to produce grouts with low cost, environmental friendliness, good workability, and excellent long-term performance. In this study, rheological performance, i.e., flowability, minislump, setting time, bleeding capacity; mechanical properties, i.e., flexural strength, compressive strength, shear bonding strength, and shrinkage; and impermeability of cement-based grouts containing 60% GGBFS, 60% FA, or 20% FA were investigated. The fluidity, spreading ability, and stability of grouts were also studied in the presence of a superplasticizer (SP) by itself and in combination with an antiwashout agent (AWA). The range of the water-solid ratio was 0.4–1.2, and the curing durations were 28, 91, and, in a few cases, 182 days. The results show that fluidity, spreading ability, stability, and drying shrinkages of the cement-based grouts were improved by the incorporation of GGBFS (20%) + FA (50%). The SP and AWA should be used together to improve both fluidity and stability. The flexural strength, compressive strength, shear bonding strength, and impermeability of equivalent binary and ternary grouts were close to those of PC-only grouts at later ages. The use of Class C FA offers more benefits than the use of Class F FA. The applications of cement-based grouts containing GGBFS (20%) + FA (50%) are promising in geotechnical engineering.
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Acknowledgments
This study was financially supported by the National Basic Research Development Program of China (973 Program) (Project No. 2013CB036001), the National Key Research and Development Program of China (Project No. 2016YFC0801604), the National Natural Science Foundation of China (Grant No. 51309146), the Ph.D. Programs Foundation of the Ministry of Education of China (No. 20130131120084), and the basic scientific research project funded by Shandong University (No. 2015YQ002).
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Journal of Materials in Civil Engineering
Volume 29 • Issue 11 • November 2017
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©2017 American Society of Civil Engineers.
History
Received: Nov 2, 2016
Accepted: May 24, 2017
Published online: Aug 31, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 31, 2018
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