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Properties of Cement-Based Grouts with High Amounts of Ground Granulated Blast-Furnace Slag and Fly Ash
AbstractA 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% GGBF+50% 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.
Properties of Cement-Based Grouts with High Amounts of Ground Granulated Blast-Furnace Slag and Fly Ash
AbstractA 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% GGBF+50% 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.
Properties of Cement-Based Grouts with High Amounts of Ground Granulated Blast-Furnace Slag and Fly Ash
Li, Wei (author) / Li, Zhaofeng / Wang, Guancong / Li, Shucai / Liu, Rentai / Sha, Fei
2017
Article (Journal)
English
BKL:
56.45
Baustoffkunde
Local classification TIB:
535/6520/6525/xxxx
| British Library Online Contents | 2017
| British Library Online Contents | 2016
Ground Granulated Blast-Furnace Slag
| Springer Verlag | 2017