Experimental Study on Fire Resistance of Concrete Beams Made with Iron Tailings Sand

Abstract

In order to measure the effect of iron tailings sand replacing natural sand on the fire resistance of concrete beams, five full-scale iron tailings sand concrete (ITSC) beams and two natural sand concrete (NSC) beams were conducted to fire testing under dead load and rising temperature conditions. The section temperature field, mid-span displacement, failure form, and fire resistance limit of ITSC beams under fire were analyzed. The main influence factors included different ISTC strengths (C30 and C40) and constraints. The analysis results were compared with those of NSC beams. The results show that the complete replacement of natural sand with iron tailings sand had little influence on the temperature field of concrete and reinforcement in simply supported beams and continuous beams under fire. The fire endurance of the ITSC simply supported beams was similar to that of NSC simply supported beams. When exposed to fire, the higher the strength of the ITSC, the better the fire resistance of the beam. The fire endurance of continuous beams was higher than that of simply supported beams. On the basis of the analysis of the fire resistance performance, it was found that iron tailings sand can replace natural sand to formulate concrete beams.

Fire Resistance of Foamed Concrete for Discontinuous Partition Filling

“…The increasing number of fires with a range of consequences such as death, loss of property, and financial issues has meant that fire resistance research has continually attracted the attention of scientists. As fire is the cause of the reduction in material properties and load-bearing capacity of structures [ 1 ], construction material regulations include fire resistance tests which provide an assessment of load-bearing characteristics and fire separation properties. The tests are performed in large furnaces with reference to a standard temperature–time curve [ 2 ] defined by the equation: where —time [min], and —the gas temperature in the fire compartment (°C) [ 3 ].…”

Hybrid Effect of Basalt and Polyacrylonitrile Fibers on Physico-Mechanical Properties of Tailing Mortar

“…Due to the low utilization ratio, a large amount of IOTs can only be piled up in tailing ponds, which not only encroach on the land and pollute the surrounding environment, but also require a large amount of maintenance funds [4][5][6]. To protect the environment and increase the economic benefits, the secondary use of IOTs in the construction industry has attracted the attention of many scholars [7,8]. Andrews et al [9] found that the compressive strength and splitting tensile strength of concrete were greatly improved with a 25% IOT substitution.…”