The Study On A New Type Of Comolex Accelerattor Of Concrete

The paper have studied a new type of complex accelerator, which contains few disbennifit components to durability of concrete such as Cl-N Ca2+. alkali and so on so that it can be able to greatly enhance the early strength of concrete and meet the requirements of item such as high fluidity , prolonging the time of coagulation, advanced early strength, no falling of anaphase strength, having excellent durability, enhancing the efficiency of construction. The new type of complex accelerator finally have been confirmed to be composed of (surface active medicament) FL, group of enhance early strength such as CSA and TUEA and active mixture of FS and silicon ash.Based on FL, CSA, FS, and silicon ash's action mechanism and characters, which have been compounded to be a new type complex accelerator so that each of them can fully bring into play it's specialty and congruence effect to satisfy with the demand of engineering.The issue of compatibility of each raw material and Portland cement has been paid importance to besides raw and processed materials have been fully filtered and analyzed in the researching process. The effects of the hardening accelerator were assessed through testing it's mechanics targets of strength of 1d, 3d, 7d, 28d and some of it's indexes of durability in order to make the hardening accelerator be fulfill the demand of durability but also have few disadvantages of influence to development of concrete's anaphase strength. The testing method of acquiring the data guide lines is based on provision of GB8076-1997 including bleeding rate, slump, concreting time. ratio of compressive strength. shrinkage rate and so on.The project has achieved a series of furthest mate of mixtures through cross experiment design and comparative tests. The mixture has been testified that it meet to GB8076-1997 concrete admixture provision for hardening acceleratar performance targets, at the same time it have many virtues to fulfil the vary requirements of concrete projects including enhance early strength, high fluidity, postpone seting, anti-erode,anti-freeze and good integration benefits.