Longitudinal change in the attitude of Australian government towards the belt and road initiative: Stages, causes and countermeasures.

To analyze the longitudinal change in the Australian government's attitude towards the Belt and Road Initiative (BRI), various sources on the BRI have been examined. The findings indicate a shift in the Australian government's attitude from positive to negative since 2013. This change can be attributed to several factors, including the influence of the United States, the presence of a conservative and xenophobic culture within Australian society, the longstanding policy of maintaining "cold political relations and hot economic ties" between Australia and China, and the political struggle between political parties in Australia. To address this issue, it is recommended to clarify the true nature of the BRI, adjust international cooperation models, enhance the standardization of international BRI cooperation mechanisms, and expedite the development of the BRI discourse system. This research may provide a political, economic, and cultural perspective on the deteriorating Sino-Australian relationship in terms of BRI cooperation.

Experimental Investigation of CO2-Induced Silica Gel as the Water Blocking Grout Effect of Aquifer Ions.

This study aimed to prevent water flow in microcracks and simultaneously achieve CO2 capture during grouting (CCG). Using sodium silicate (SS) as the primary material, the microcracks were grouted by a two-step approach. The low-initial-viscosity (5 mPa s) SS was first saturated within the microcracks followed by CO2 injection at 2 MPa. Through CO2 dissolution, silica gel was developed and tolerated a hydraulic pressure of up to 5.5 MPa. The effects of aquifer ions (Na+, Ca2+, Mg2+, HCO3 -, and SO4 2-) were equally evaluated at harsh conditions, and it was found that the strength of the silica gel was reduced, which was caused by salting out, low CO2 solubility, and precipitation. As a result, the hydraulic pressure was reduced to as low as 3 MPa. After 210 days, 16% of the silica gels (without ion inclusion) were reversible to the liquid phase, where a similar effect was found in the cases of Na+ and Mg2+ ions. The degradation increased with more Ca2+ ions (up to 55%) and decreased with more HCO3 - and SO4 2- ions. Microcracks grouted with CCG extended the CO2 utilization in grouting application. Combined with the effect of dissolved ions, the proposed approach is feasible in the field implementation for underground engineering under water bodies.