Abstract
To evaluate the effects of industrial by-products materials on the performance of porous concrete for plant growth, this study investigated the physical, strength, and freeze/thaw resistances of porous concrete for plant growth, prepared by replacing cement with blast furnace slag powder at 60% by weight, and replacing natural stone aggregates with coarse blast furnace slag aggregates at rates of 0%, 20%, 40%, 60% and 100% by weight. In addition, the effects of adding natural jute fiber and styrene butadiene (SB) latex to these concrete mixtures were evaluated. The void ratio, compressive strength, and freeze/thaw resistance of the samples were measured. With increasing replacement rate of blast furnace aggregates, addition of latex, and mixing of natural jute fiber the void ratio of the concrete was increased. Compressive strength decreased as the replacement rate of blast-furnace slag aggregates increased. The compressive strength decreased after 100 freeze/thaw cycles, regardless of the replacement rate of blast furnace slag aggregates or of the addition of natural jute fiber and latex. The addition of natural jute fiber and latex decreased the compressive strength after 100 freeze/thaw cycles. The test results indicate that the control mixture satisfied the target compressive strength of 10 MPa and the target void ratio of 25% at replacement rates of 0% and 20% for blast furnace aggregates, and that the mixtures containing latex satisfied the criteria up to an aggregate replacement rate of 60%. However, the mixtures containing natural jute fiber did not satisfy these criteria. The relationship between void ratio and residual compressive strength after 100 freeze/thaw cycles indicates that the control mixture and the mixtures containing jute fiber at aggregate replacement rates of 20% and 40% satisfied the target void ratio of 25% and the target residual compressive strength of over 80% after 100 freeze/thaw cycles. The mixtures containing latex and aggregate replacement rates up to 60% satisfied the target void ratio and compressive strength.
Highlights
As interest in ecological restoration has increased in Korea and other countries, diverse research has been conducted into appropriate concrete design
The effects of varying mixtures of porous concrete for plants growth produced using a dry process were investigated: natural natural coarse coarse aggregates aggregates were replaced with coarse blast furnace slag aggregates, and fine blast furnace slag powder was used as a replacement for cement
The replacement rate of blast‐furnace slag aggregates increased; this is because blast furnace slag replacement rate of blast-furnace slag aggregates increased; this is because blast furnace slag aggregates aggregates are porous
Summary
As interest in ecological restoration has increased in Korea and other countries, diverse research has been conducted into appropriate concrete design. A 40%–60% by weight replacement of cement with a fine powder of blast furnace slag, an industrial by-product, is effective in reducing both the use of cement and the alkalinity of concrete [5,6]. Replacing rock-crushed stone with blast furnace slag aggregates is considered to be of use both in environmental protection and resource recycling. Blast furnace slag aggregates have been used extensively as substrates or as auxiliary base floor materials; a great deal of research has been conducted in recent years into their use as concrete aggregates. Blast furnace slag powder was used to replace up to 60% of the cement weight in concrete fabrication, and the effects of adding styrene butadiene (SB) latex and natural jute fiber were evaluated. The effect of the replacement rate of crushed stone aggregates with coarse aggregates of blast furnace slag on the physical and strength performance of porous concrete was investigated
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