China to invest $532 million in Rwanda in 2011 CHINA will invest about $532 million in Rwanda this year,mainly targeting critical economic engines such as building roads and vocational schools,said Shu Zhan,Chinese A...China to invest $532 million in Rwanda in 2011 CHINA will invest about $532 million in Rwanda this year,mainly targeting critical economic engines such as building roads and vocational schools,said Shu Zhan,Chinese Ambassador to Rwanda,in early February. "We need to have adequate field surveys,wide consultation and detailed ’homework,’ in order to come up with tailor-made solutions that meet local needs," Shu said in an interview with ChinAfrica.展开更多
Rice Husk Ash(RHA)has been found as a potential partial replacement for cement in concrete.This study attempts to make an evidence based evaluation of the sustainability and benefits of RHA utilisation as partial repl...Rice Husk Ash(RHA)has been found as a potential partial replacement for cement in concrete.This study attempts to make an evidence based evaluation of the sustainability and benefits of RHA utilisation as partial replacement of cement in road concrete works within Anambra State of Nigeria.The ashes of the rice husks collected from different locations were characterised.Direct interviews were conducted among the rice mill personnel and experts in the construction companies.The values of SiO2+Fe2O3+Al2O3 for the four analysed RHA samples ranged from 78.9%to 80.3%as revealed by the X-ray fluorescence analysis.This confirms that they are pozzolanic.The highest observed 28th day compressive strength of concrete was 41.8 N/mm2 for the concrete containing 10%RHA.Beyond the 10%replacement level,the compressive strength dropped below the control values.The result of the Analytical Hierarchy Process(AHP)analysis displayed the highest option preference of 40.3%for utilising RHA in road construction.These show that utilising RHA for road concrete works would be a sustainable option.10%replacement of cement with RHA was recommended for optimum performance based on the compressive strengths of the tested RHA based concretes.展开更多
With the acceleration of urbanization and the continuous improvement of urban infrastructure construction,roads and bridges,as an important infrastructure content in China,directly affect people's daily travel.The...With the acceleration of urbanization and the continuous improvement of urban infrastructure construction,roads and bridges,as an important infrastructure content in China,directly affect people's daily travel.Therefore,the construction and management of roads and bridges must be improved to ensure the quality and safety of roads and bridges and effectively prevent safety accidents.Strengthen the management of road and bridge construction through safety monitoring,improve the safety factor of the project and ensure people's travel safety.This paper mainly analyzes the common diseases and construction technology of road and bridge engineering construction,and puts forward safety monitoring measures.展开更多
文摘China to invest $532 million in Rwanda in 2011 CHINA will invest about $532 million in Rwanda this year,mainly targeting critical economic engines such as building roads and vocational schools,said Shu Zhan,Chinese Ambassador to Rwanda,in early February. "We need to have adequate field surveys,wide consultation and detailed ’homework,’ in order to come up with tailor-made solutions that meet local needs," Shu said in an interview with ChinAfrica.
文摘Rice Husk Ash(RHA)has been found as a potential partial replacement for cement in concrete.This study attempts to make an evidence based evaluation of the sustainability and benefits of RHA utilisation as partial replacement of cement in road concrete works within Anambra State of Nigeria.The ashes of the rice husks collected from different locations were characterised.Direct interviews were conducted among the rice mill personnel and experts in the construction companies.The values of SiO2+Fe2O3+Al2O3 for the four analysed RHA samples ranged from 78.9%to 80.3%as revealed by the X-ray fluorescence analysis.This confirms that they are pozzolanic.The highest observed 28th day compressive strength of concrete was 41.8 N/mm2 for the concrete containing 10%RHA.Beyond the 10%replacement level,the compressive strength dropped below the control values.The result of the Analytical Hierarchy Process(AHP)analysis displayed the highest option preference of 40.3%for utilising RHA in road construction.These show that utilising RHA for road concrete works would be a sustainable option.10%replacement of cement with RHA was recommended for optimum performance based on the compressive strengths of the tested RHA based concretes.
文摘With the acceleration of urbanization and the continuous improvement of urban infrastructure construction,roads and bridges,as an important infrastructure content in China,directly affect people's daily travel.Therefore,the construction and management of roads and bridges must be improved to ensure the quality and safety of roads and bridges and effectively prevent safety accidents.Strengthen the management of road and bridge construction through safety monitoring,improve the safety factor of the project and ensure people's travel safety.This paper mainly analyzes the common diseases and construction technology of road and bridge engineering construction,and puts forward safety monitoring measures.
