Abstract
The sprayed concrete in mine roadways suffers from a prolonged exposure to the harsh environment in the underground mine, leading to its detachment which may compromise its supporting strength. Besides, the dust-cementing effect of the conventional concrete is poor, providing very limited contribution to suppress the dust-laden airflow. As such, the present experiment uses sodium carboxymethyl cellulose as the base to produce a novel thin spray material through graft copolymerization based on acrylic acid and polyaluminum chloride. This new material can not only reinforce the surrounding rock of the roadway but also cement the dust in the airflow. Infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, and SEM are employed collectively to study the microscale reaction and structure of the product. A suite of experiment testing is carried out concerning the performance of the developed spray material, which reveals the supreme mechanical strength and desired properties of the hardened film developed from the spray material.
Highlights
Due to the harsh environment in the underground mine with high stress, high temperature, high humidity, and persistent ventilation, the surrounding rock of the roadway is subject to weathering [1,2,3]. e anchor network suffers from severe corrosion, which compromises the reinforcement strength
Spray of rock dust, cleaning, and cement swabbing have to be applied to the roadway on a periodical basis to suppress the dispersion of the dust. ese measures are notoriously water, labor, and material-consuming and give rise to a hostile working environment. erefore, it is of paramount importance to develop a novel concrete spray that can be applied in a quick, cost-effective, and environmentally friendly manner and can help suppress the dust dispersion in the roadway [8,9,10]
The contents of acrylic acid, initiator ammonium persulfate, and polyaluminum chloride, as well as reaction temperature, affect the properties of the product considerably. e present experiment uses 2.5 grams of sodium carboxymethyl cellulose as the base and designs a suite of single-factor experiments based on using the hardness of the established film as a performance indicator for studying the impact of the reactant composition on the prepared product
Summary
Due to the harsh environment in the underground mine with high stress, high temperature, high humidity, and persistent ventilation, the surrounding rock of the roadway is subject to weathering [1,2,3]. e anchor network suffers from severe corrosion, which compromises the reinforcement strength. E intermediate product in turn reacts with polyaluminum chloride through the coordination chelating effect to generate a potent spray material Applying this material to the concrete and wire mesh surface can provide secondary reinforcement to the surrounding rock, prevent airflow leakage in the roadway, and slow down the corrosion of the wire mesh. Infrared spectroscopy, thermal gravimetric analysis, X-ray diffraction, and SEM techniques are employed to analyze the microscale reaction and structure of the developed product; a hardness test on the developed hardened film is carried out to investigate the antiweathering performance of the product; a tensile strength test is conducted to show the product’s ability to withstand the external force; anticompression and antibending tests are performed to test the protective ability of the product; an adhesive effect test is conducted to study the product’s ability to absorb dust; and a cementing test is utilized to illustrate the product’s ability to trap the entrained dust in the roadway airflow
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