Experimental study on foam concrete as subgrade filler for ballastless track of high-speed railway

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Hasad Foods, the agricultural investment arm of Qatar's sovereign wealth fund, said the government would increase its grain reserves from 250,000 tons to 300,000 tons in the near future, which is enough to feed the population for six months.  

With a lot of deserts, Qatar suffers from water shortages, and Qatar depends on food imports for a long time. Recently, the ongoing tension in Ukraine has caused global food supply tension and rising prices.

In addition to that, the geopolitical situation also affects the supply and prices of many commodities like the foamed concrete,lightweight foamed concrete.

Controlling the settlement of ballastless track subgrade in special soils is a scientific problem that has always existed in the construction and operation of high-speed railways, mainly due to the consolidation and settlement of ground soil, which is caused by the additional stress caused by heavy loads.

In order to reduce the subgrade weight and additional stress, lightweight foamed concrete can be used as subgrade filler to control subgrade settlement in special soil areas. However, it is unclear whether ballastless track subgrades filled with lightweight foam concrete have long-term dynamic stability under cyclic loading.

To solve this problem, Luoyang Tongrun conducted compressive strength and dynamic triaxial tests to analyze the static and dynamic strength of lightweight foamed concrete. A large subgrade model filled with lightweight foam concrete with a target density of 650 kg/m³ was then built to determine its long-term performance under cyclic dynamic loading.

The results show that the strength of the lightweight foamed concrete with the target density of 500-800 kg/m³ can meet the requirements of the static and dynamic conditions of the ballastless track subgrade, and the ballastless track subgrade with the target density of the lightweight foamed concrete.

When a foam concrete dynamic buffer layer of 650 kg/m³ with a thickness of 0.5 m is set between the lightweight foam concrete layer and the foundation slab, it has good long-term dynamic stability under cyclic dynamic loads.

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Recently, Rosneft announced that a large oil deposit has been discovered in Bochao Lahai, with reserves equivalent to 82 million tons of oil. The discovery benefited from oil drilling in the Medinskova Landsky area. Rosneft pointed out that the discovery proves the great oil potential of the Timano-Bechula region, which will be the basis for the company to continue to research and develop the region.

In addition, Russian billionaire Vladimir Potanin, the largest shareholder of Norilsk Nickel, said recently that he was prepared to discuss the merger of Norilsk Nickel and aluminum giant Rusal.

"We have received a proposal from Rusal management to discuss a merger with Norilsk Nickel as an alternative to extending the shareholder agreement," Potanin said in an interview with Russia's RBC TV channel. I sent a letter confirming that we agreed to initiate discussions with Rusal on a merger. "

Potanin owns about 35 per cent of Norilsk Nickel. Norilsk Nickel is a major producer of nickel and copper and the world's largest palladium miner. Norilsk Nickel and Rusal had a market capitalization of $49 billion and $15 billion, respectively, as of Monday local time, according to Refinitiv Eikon.

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