摘要：公路对国民经济的发展有着极为重要的影响;伴随信息技术的飞速发展,在公路工程建设中我们加大了信息技术在项目管理中的应用,以不断的提高工程管理信息系统的应用水平,从而不断的提高公路运营、建设质量与经济效益。工程管理信息系统与现代信息技术的应用,不但提高了信息处理的效率,同时也提高了工程管理中目标控制的有效性和工作流程的及时性,从而使公路项目管理实现标准化、现代化、科学化。

摘要：目前,我国的高速公路建设事业蒸蒸日上,伴随而来的高速公路绿化工程也逐渐引起人们的重视,本文试以河南省为研究对象,从当前的高速公路绿化现状出发,提出若干促进绿化事业的举措。

摘要：Looking at the five-thousand-year history of mankind,humans developed a series of technology of building environment,*** *** we say the development of civil engineering is an epitome of the glorious civilisation,the discovery and enhance of material proclaim the developing civil *** have found many sorts of traditional materials(soil,timber,masonry) and modern materials(concrete,glass,fibre,polymer).Among these,concrete as composite material played the greatest role in engineering over the last two hundred years.1 The development of concrete alone the historyThe predecessor of concrete has been served human for thousands of *** used mud mixed with straw to bind dried bricks 5000 years *** utilized lime and gypsum mortar as a binding agent for building the *** used cementitious materials to hold bamboo together in boats and in the Great *** built many magnificent structures with pozzolana *** the art of concrete was lost as Roman Empire *** at the middle of 18th century,John Smeaton,British Engineer,rediscovered hydraulic cement(*** in water) made from pebbles as a coarse aggregate and powered brick as *** into 19th century,more hydraulic cement was created and *** milestone in advance of cement is in 1824 Joseph Aspdin made the first genuine artificial cement-Portland cement by burning ground limestone and clay ***,he improved the properties,it became the modern cement and has been widely used around the world ever *** its great performance,demand was increased fast.2 The characteristics of concreteConcrete is the combination of aggregate and bonding *** should have properties of substantial hardness,chemically inertia,stable volume and can be classified as fine aggregate(sand) and coarse aggregate(granite,gravel,limestone).Fine aggregate *** is used in making concrete slabs and smooth *** aggregate i