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 Geplaatst: 22-06-2018 06:54:08 Onderwerp: The expert |
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Concrete barriers were developed and tested to reduce the Crossover Roberto Osuna Jersey , the most hazardous of motor accidents. According to the World Commission on Environment and Development. A sustainable development is a development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Concrete is one of the most sustainable construction materials and has reduced impact on the environment. When the construction costs of different safety barrier system is compared, concrete barriers are exceptionally cost-effective. Also, it provides functional life of at least 50 years, whereas steel works well for just 20 years. Here are some environmental and social benefits of using Highway concrete barriers,
- It pollutes less with reduced emission of green house gases during its production. It does not rely much on quarried materials. Concrete barriers make use of recycled concrete aggregate and by products of other industries like water, fly ash, fuel or other cementitious materials etc. Though steel barriers are also recyclable, they need to be hot tip galvanized to increase their lifetime which introduces environmental and economic issues.
- Based on the industry-agreed values for construction materials, the average embodied quantity of co2 in concrete is significantly lower than the steel. Moreover the whole-life environment impact of concrete barriers is positive. With a service life of 50 years, it does not require much maintenance. Hence, there is less disruption of ongoing vehicles, traffic management and lane closures.
Highway concrete barriers have the ability to withstand and remain usable even after severe collisions and dona€™t need to be replaced often due to damage.
- Steel barriers could also pollute the roads especially during winter. On the other hand, Concrete barriers do not contribute to any type of pollution in its highway application. Waste crushed bits of concrete have numerous secondary applications too.
- Most people know that concrete barrier requires steel for effective construction. But the steel used for this purpose is a 100% recycled scrap which consumes half the energy required to make the same amount of structural-grade steel.
- As Concrete barriers have high containment level, it can provide required safety with less working widths.
- Concrete barriers offers low level screen and reduce glare at night from the visual perspective of the motorist. Thus it provides a healthy environment for driving during late hours.
Thus, Concrete barriers follow the three ideals of sustainable development such as environment, social and economic factors.
by Mao Pengfei, Nguon Sovan
PHNOM PENH, June 21 (Xinhua) -- Since its return to China 20 years ago, Hong Kong has been enjoying rapid economic development and people's livelihood has been improved, Cambodian government official and experts said.
On July 1, 1997, the Chinese government resumed the exercise of sovereignty over Hong Kong, and Hong Kong returned to the embrace of the motherland and embarked on the broad road of common development with the Chinese mainland.
What Hong Kong has achieved since it returned to China in 1997 has truly demonstrated unity and solidarity among the Chinese people, according to Phay Siphan, Cambodia's secretary of state and spokesman for the Council of Ministers.
Noting that Hong Kong is an international financial and trade hub, he predicted Hong Kong's economy will grow even stronger in the future with the policy support from the central government.
Commenting on the principle of "one country, two systems," Siphan said the principle has delivered prosperity and stability to Hong Kong and the people there.
"One country, two systems" is a basic state policy the Chinese government has adopted to realize the peaceful reunification of the country.
The policy has ensured Hong Kong's smooth return to the motherland on July 1, 1997, and at the same time, the Hong Kong Special Administrative Region (SAR) was established and the Basic Law came into effect. Hong Kong entered a new epoch characterized by "one country, two systems," "Hong Kong people governing Hong Kong" and a high degree of autonomy.
The implementation of the "one country, two systems" principle in the Hong Kong SAR has achieved widely recognized success.
Chheang Vannarith, chairman of the Cambodian Institute for Strategic Studies, said Hong Kong's return to China has produced very positive outcomes in terms of economic integration, people-to-people connectivity and institutional harmonization.
"Hong Kong's economy has become more connected with the region and the world, and Hong Kong people have benefited," he told Xinhua.
Sharing his view on the practice of "one country, two systems" in Hong Kong, Chheang Vannarith said it "works well and produces concrete results."
Joseph Matthews, director of the Association of Southeast Asian Nations (ASEAN) Education Center, said that in the beginning, there were a lot of skepticism with regard to the "one country, two systems" principle.
"Despite all the speculations and Sinophobia, China remains committed to its commitment and has kept 'one country, two systems' intact successfully in the last two decades," Matthews said.
"Even though it was a unique idea and this kind of experiment has never been done before, and the odds against its success were very high, but strong unwavering determination by Beijing has made this impossible possible and triumph," he added.
The expert said the principle has helped Hong Kong preserve its identity as a free market economy and the living standards of Hong Kong residents have also been improved under this principle.
Mey Kalyan, chairman of the state-run Royal University of Phnom Penh's b. Raphael Guerreiro Portugal Jersey Paul Pogba France Jersey Raheem Sterling England Jersey Milan Badelj Croatia Jersey Roger Martinez Colombia Jersey Taison Brazil Jersey Thomas Meunier Belgium Jersey Nicolas Otamendi Argentina Jersey Mauricio Victorino Uruguay Jersey Xherdan Shaqiri Switzerland Jersey |
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