Search

• A blast furnace slag-based mortar grouting material (BFSBM) was developed from industrial by-product. • The optimum mix ratio of grouting material was determined based on its rheological properties and mechanical strengths. • A new self-developed experimental device was designed for the grouting simulation to study the grouting effects. Introducing the blast furnace slag (BFS) into grouting materials not only can improve its performances significantly but also can recycle the industrial by-product economically. The current researches related to BFS mainly focus on the preparation and evaluation of BFS-based paste (BFSBP). However, the grouting effects of hardened grout stone body with BFS-based mortar (BFSBM) are investigated rarely. In this study, a BFSBM material was developed based on BFS and its optimum mix ratio was determined. A new self-developed grouting simulation device was designed to study the grouting effects of hardened grout stone body based on different road grades and grouting diffusion radii. The results show that the optimum mix ratio of BFSBM determined as m SS / m BFS , m SH / m BFS , m W / m BFS, and m S / m BFS are 0.11, 0.09, 0.42 and 0.4, respectively (SS, SH, W, and S represent sodium silicate, solid sodium hydroxide, purified water, and sand, respectively). BFSBM has a good grouting effect on void road bases and the highest 7d compressive strength of the core sample taken from the expressway highway void base reaches 13.2 MPa. The 7d compressive strength of the core sample 60 cm away from the grouting hole is 63.2% higher than the compressive strength in the requirements. [ABSTRACT FROM AUTHOR]

Alkali-activated Materials (AAM) has been applied in road engineering as an environmentally friendly material in recent years. This study prepared road alkali-activated blast furnace slag (AABFS) paste in different mixture ratios based on an orthogonal test scheme. The fluidity, setting time, mechanical strengths, and other properties were systematically evaluated to determine the optimum mixture ratio of paste. Finally, the microstructural characteristics and reaction mechanism of AABFS paste were investigated. The results showed that changes in the mass ratio of sodium hydroxide and blast furnace slag ( m SH / m SL ) have great influence on the performance parameters, including the fluidity, setting time, flexural strength, and compressive strength. Results at the microstructural level indicated that the structure of the AABFS paste specimen prepared at the optimum ratio is more compact and uniform, and the AABFS paste can be applied effectively in road-grouting reinforcement. [ABSTRACT FROM AUTHOR]