Spalling Criterion of Hard Brittle Rock Mass Based on Dilatation Lateral Strain.

Spalling failure is a typical failure phenomenon after excavation and unloading of a deep, hard brittle rock mass, which seriously threatens the safe construction of deep roadways (tunnels) and other projects. From the engineering viewpoint, it is essential to accurately evaluate the range and depth of surrounding rock spalling failure. From the perspective of the laboratory and engineering site, the strength and formation mechanism of hard rock spalling failure were statistically summarized and analyzed.

Effects of Fe and Al ions during hydrogen sulphide (HS)-induced corrosion of tetracalcium aluminoferrite (CAF) and tricalcium aluminate (CA).

With high concentration and toxic HS gas found in sewage facilities, it has ultra-high leakage risk and great environment impact, once the sealing material failure. In this study, hydrogen sulphide (HS)-induced corrosion effects of tetracalcium aluminoferrite (CAF) and tricalcium aluminate (CA) phases of cement were evaluated during the initial stages of reaction. Both phase changes and bond structures were examined by techniques including Fourier transform infrared spectroscopy (FTIR).

Application of novel catalytic-ceramic-filler in a coupled system for long-chain dicarboxylic acids manufacturing wastewater treatment.

To gain systematic technology for long-chain dicarboxylic acids (LDCA) manufacturing wastewater treatment, catalytic micro-electrolysis (CME) coupling with adsorption-biodegradation sludge (AB) process was studied. Firstly, novel catalytic-ceramic-filler was prepared from scrap iron, clay and copper sulfate solution and packed in the CME reactor. To remove residual n-alkane and LDCA, the CME reactor was utilized for LDCA wastewater pretreatment.