Research on Complex NanoElement Used for Controlling Temperature in Mass Concrete

Abstract:

Complex nanoelements were made of organic betoniescapric acid for controlling temperature and energy saving.They were managed to sand like grains named phase change sand to enhance their consistent with raw materials of concrete.The influence of particle size distribution of phase change sand and its content on workability,strength and durability of concrete were studied.The method of simulating mass concrete was adopted to study effect of controlling temperature of phase change sand.Super SAP analysis method was introduced to calculate temperature distribution of mass concrete.The results show that phase change sand made of complex nanoelements enwrapped with latex and high strength cement consistent good with raw materials of concrete.Concrete with phase change sand can satisfy workability and strength when the fineness of phase change sand is middle to coarse,the content of water reducing agent is increased properly,and the substitution quantity of phase change sand for fine aggregate reaches 25%.Phase change sand doesn’t bring bad conglutination ability and bad water holding ability in lower content whereas it will bring lower fluidity and lower strength of concrete in higher content.The results of electric flux test for concrete show that phase change sand doesn’t affect durability of concrete in proper content.The test of simulating of temperature moving up in mass concrete show that the highest temperature in center is 44 ℃ which reduces 4.5 ℃ compared to that in norm concrete.Phase change sand needs to be added in center of mass concrete.The volume percent of center where higher than 45 ℃ increases with dimension of mass concrete.

Key words:complex nanoelements; mass concrete; controlling temperature