THE SIZE EFFECT OF THE FRACTURE ENERGY OF CONCRETE TESTED BY THREE POINT BENDING

This paper ainalyses the size effect of the fracture energy of concrete tested bythree point bending. It is shown that positive errors of test results of fracture energy increase,ornegative errors decrease with increasing of the specimen ize. The phenomenon is one of main causesresulting in the size effect of fracture energy.     

海门市蔬菜病虫害测报现状及思考

为提高海门市蔬菜病虫害测报的准确率,根据海门市近几年蔬菜病虫害测报和防治实践,提出应明确测报对象．制定切实可行的测报方法,提高专业测报人员的素质,并充分利用蔬菜合作社平台开展蔬菜病虫害测报工作。     

双波灯诱集棉铃虫的效果评价

通过对１９９６ ～１９９８ 年３ ａ 的双波灯与杨树把诱集棉铃虫的结果比较分析,双波 灯诱蛾具有诱蛾数量多、蛾峰明显、雄蛾多于雌蛾等特点。可以将之用于棉铃虫的预测预报。     

Carbonation Resistance of High_addition Flyash Concrete

In order to improve carbonation resistance of high_addition flyash concrete,the grinding of flyash and additon of hydrated_lime in flyash concrete have been studied.It is shown that it is possible to improve the carbonation resistance of high_addition flyash concrete by using these methods without reducing its strength.     

除草剂药害事故的发生与应对策略

本文在对2004年～2008年4月份期间海门地区种植业中除草剂药害事故发生情况进行调查研究的基础上,较为系统地阐述了海门市除草剂药害发生特点,并从主客观方面深入浅出地剖析了发生除草剂药害的诸多原因,文章最后就如何规避、杜绝和解除除草剂药害事故给出了一系列技术措施.     

正达防除加拿大一枝黄花效果

40%正达防除加拿大一枝黄花,用药10 d以后杀草优势明显;药后15 d株防效与鲜重防效分别达95.8%与97.9%,且有一定的土壤封闭作用。     

Alkalinity of Pore Fluid of High_addition Flyash Concrete

It is shown that the alkalinity of pore fluid of high addition flyash concrete decreases more greatly than that of normal concrete after 7 days,closing to the threshold value of 11.5.Having added 10%lime and 1.5%Na2SO4 in flyash concrete,the alkalinity increased evidently without reducing its strength.     

Study on the Lime Shape in the Essential System of Activated FA with Water Reducer

This paper studies the lime shape in the essential system of activated FA with water reducer.It shows that the water reducer has passive influence on activation of FA when lime is unslaked,and it will have positive influence when lime is slaked.A primary analysis has been done.     

Research and Production of Non-Fired and Non-Steam-Cured Clinker_Free Fly Ash Bricks

A fly ash brick is developed by using fly ash-lime-sulphate system as the binding material, added with certain quantities of aggregates and moulded by press, which can yield 28-day compressive strength up to 20 MPa under normal curing conditions. The factors affecting the strength of product are analyzed.