Self-conserving Heat Concrete

Saving energy and conserving energy is becoming the main title in building market. Our country has proposed to save 50% energy and ban the use of brick. So new building materials and method of conserving energy need to be developed. This article is focused on low strength lightweight aggregate concrete. The main ideas are as follow.Firstly, the basic properties of CL5. 0 lightweight aggregate concrete are tested and it is emphasized to the heat preservation. The results of experiments show that CL5. 0 lightweight aggregate concrete have good property of heat preservation and its coefficient of heat conductivity is 0.697 W/m C under humid conditions. For 50% cement is replaced by fly ash, there is good economic and society benefit. The ceramsite of fly ash hull is developed and the basic properties are tested.Secondly, a new design method is proposed to the mix ratio design of lightweight aggregate concrete and given experimental test. The results show the design method of lightweight aggregate concrete is best adopted by loose volume method and the basic coefficients are sand-aggregate ratio SP, glue-capacity ratio C/ P hand unit water consumption W. Some conclusions are drawn which are that unit water consumption is about 160 Kg/m1 and aggregate-cement ratio n is about 3.45. Also a new term -filler coefficient e8 is derived during deducing sang-aggregate ratio.Lastly the properties of rigid polyurethane foams dashed with fly ash and ceramsite are tested and the results show that the strength of rigid polyurethane foams can be up to 0. 15 MPa , or even higher. The sparkling quantity is influenced badly by sparkling technology.