Corrosion resistance and modification mechanism of modified anchoring grouting material in carbonaceous mudstone environment

Abstract

In the corrosive environment of carbonaceous mudstone, the mechanical properties of grouting materials in the anchorage section of anchor bolts continue to deteriorate. In response, a cement-based modified anchoring grouting material (MAGM) with high corrosion resistance was developed. The results reveal that compared with those of ordinary Portland cement (OPC) grouting material, the compressive strength, tensile strength, and shear stress peak of the MAGM increased by 85.9%, 44.4% and 45.4%, respectively, after 28 d of corrosion in a carbonaceous mudstone solution. Waterborne epoxy resin and curing agent create a network membrane structure under the action of nano-Al₂O₃ to protect the cement hydration products. In the corrosive environment of carbonaceous mudstone, corrosion products formed on the surface of the stone body have adsorbed onto the reticular membrane structure, filling the pores of the stone body and slowing the erosion rate of ions. After 365 d of application of MAGM and OPC in the corrosive environment of a carbonaceous mudstone slope, the peak shear stress of MAGM is, on average, 55.3% greater than that of OPC.

Keywords

grouting material / nanometer material / water epoxy resin / modification mechanism / carbonaceous mudstone

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