Inhibiting Alkali - Aggregate Reaction Of Concrete And Its Application Technology

The Alkali-Aggregate Reactiona as one of the concrete-structure durabe questions have restraining function for the content of AAR is researched in the thesis .The principal tasks are as follows:The classification of AAR is difined in the thesis . AAR can be assorted two classifications: Alkali-Silica Reaction (ASR) and Alkali-Carbonate Reaction (ACR).the motive mechanism of the AAR of concrete: if the concrete project happens the AAR, it must have three conditions. First of all, the content of alkali of raw materials of concrete must be high. Secondly, the skeletal material must have active ingredient. Thirdly, the surroundings must be moist and can provide abundant moisture and moist air. The intrinsic hypostasis and the motive mechanism of the AAR of concrete project is researched in this thesis.The prevention and identification of AAR are defined. In order to prevent the AAR, we must control the content of alkali of cement and control the content of alkali of concrete under 3kg and control the degree of the moist of concrete and add mixture material (for example: fly ash and so on) and use chemical additive and use the inactive material. We define the count-method of the content of alkali of concrete in detail, the examination and judgment of the content of alkali of concrete. We also define that how to identify the AAR in real project and how to distinguish the difference of the durability among other concretes.From this experiment of the actual works indicated that: fly ash have restraining function for the AAR. We can conclude that comparing with sample with no adding fly ash, the expand of AAR of the sample with adding fly ash reduce. Regarding the sample with different aggregates, the reduced extent of expand is different because of the content of alkali. When we add fly ash to...