Mechanical and Durability Properties of Induction‐Furnace‐Slag‐Incorporated Recycled Aggregate Concrete

Abstract

Most of the steel mills in Bangladesh use induction furnace which produces large quantities of slags that have very little use except land filling. Therefore, feasibility of using this slag is examined in concrete with recycled aggregate, which is another waste product that is generated due to removal of old structures. Concrete with three target strengths, 17.23, 20.68, and 24.13 MPa, was prepared using recycled concrete acquired from a recently demolished building in Dhaka, Bangladesh. Recycled coarse aggregate was replaced with induction furnace slag by 0%, 25%, 50%, 75%, and 100% for each target strength. Samples prepared from these concretes were tested for workability, compressive strength, splitting tensile strength, modulus of elasticity, and durability properties e.g., porosity, absorption, and rapid chloride penetration. Review of test results suggests that workability of concrete was not adversely affected by incorporation of induction furnace slag. For up to 50% of induction furnace slag replacement, both compressive strength and splitting tensile strength increased in recycled aggregate concrete. Further, for all ratios of induction furnace slag replacement, modulus of elasticity increased compared to 100% recycled aggregate concrete. Porosity and absorption also decreased in concrete where up to 50% of recycled aggregate was replaced by induction furnace slag. Considering these, it is concluded that 50% of recycled aggregate can be replaced by induction furnace slag that will result in superior mechanical and durability properties in recycled aggregate concrete.

Effects of an Applied Load on the Chloride Penetration of Concrete with Recycled Aggregates and Recycled Powder

“…With the rapid development of economy and construction industry, large amounts of construction and demolition (C&D) wastes are being produced, and it was estimated that about 1.8 billion tons of C&D wastes were produced in China in 2017 [21,22]. e disposal of such C&D wastes at landfills will inevitably induce a series of environmental problems, since the C&D wastes may contain hazardous substances, leading to land occupation, water pollution, etc.…”

Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

“…e macroproperties was closely related to the microproperties of cementitious materials [36][37][38], and thus further microscopic test and analysis should be conducted to achieve a better understanding on the chloride migration mechanism in unsaturated concrete. In addition, considering the wide use of recycled concrete in construction engineering [39][40][41], the chloride penetration into recycled concrete under the coupling effects of internal moisture content and external RH should be investigated in further. .…”

Performance of Ladle Furnace Slag in Mortar under Standard and Accelerated Curing

“…Mainly, fly ash and RHA have been the point of interest to the researchers. Steel slags, available in plenty, primarily due to the growing industries (∼400 steel mills), have also been considered for a smaller number of studies [21]. Approximately, 1.1-1.3 million metric tonnes of steel slag are produced per annum in Bangladesh [21].…”

“…Steel slags, available in plenty, primarily due to the growing industries (∼400 steel mills), have also been considered for a smaller number of studies [21]. Approximately, 1.1-1.3 million metric tonnes of steel slag are produced per annum in Bangladesh [21]. ese include ladle furnace slag (LFS)-a secondary by-product of the steel making process.…”