Abstract
The process of research on the compressive strength, the porosity and mechanism of solidifying concrete debris relationship with the dosage of the cement, lime and gypsum is explained based on the filling and cementating theory. According to the research, the dosage of cement curing agent used for cementing and filling the pores among the grains of concrete debris is consistent with that of compressive strength and porosity from different methods of curing concrete debris. However, the dosage of lime and gypsum curing agent are not the case. That is to say, the dosage of cement used for filling and cementing pores in experiment is equal to that from the theory. But the dosage of lime or gypsum from the experiment is less than that of fully filling the pores among concrete debris from theoretical calculation. It is demonstrated that the process of cement solidifying concrete debris complies with the theoretical model of stabilized soil, while the cement-lime or cement-gypsum composite solidifying agent does not. A hypothesis is made that the mechanism of cement solidifing debris is achieved through filling and cementing. Based on microstructure analysis, a conclusion would be made that the mechanism of the curing agent made by cement - lime or cement - gypsum composite is that their interactions produced a large amount of acicular ettringite and gelling materials, and the interaction of these sediment particles is able to improve the microstructure of solidified objects. For this reason, macroscopic compr essive strength of curing concrete debris was improved.
