Experiment Research of Mechanical Properties on Recycled Aggregate Concrete with Multiple Cementitious Materials System
WANG Jiabin1,2, HOU Zeyu1,2, ZHANG Kaifeng3, WANG Bin1, LI Heng1
1 Civil & Architecture Engineering, Xi'an Technological University, Xi'an 710021, China 2 Xi'an Key Laboratory of Civil Engineering Testing and Destruction Analysis on Military-Civil Dual Use Technology (XATU), Xi'an Technological University, Xi'an 710021, China 3 China West Construction North Co., Ltd.,Xi'an 710065, China
Abstract: In order to research the influence of mechanical properties of recycled aggregate concrete (RAC) with multiple cementitious materials system and the relationship between strength indexes of splitting tensile strength, axial compressive strength and cubic compressive strength, thirty-five RAC mixtures with binary, ternary, quaternary and multiple cementitious materials system (CMS) based on cement, fly ash, slag , silica fume and metakaolin were designed. For binary binder system, the compressive strength of RAC was first increased and then quickly decreased as the highest replacement of 20wt% on fly ash and silica fume. With the replacement of fly ash reducing, the mechanical properties of RAC with ternary binder system are enhanced. About ternary binder system, the mechanical properties of RAC with 15wt% fly ash and 15wt% metakaolin were obviously higher than those with 15wt% fly ash and 15wt% slag. Further more, the strengths of RAC with multiple CMS had the significantly effect on SCMs combination. When the mass ratio of fly ash, slag, silica fume and metakaolin was 3∶1∶1∶1, the compressive and splitting tensile strengths of RAC were 67.4 MPa and 5.23 MPa, respectively. In addition, the mineral composition and its relative content of RAC curing for 90 d were tested by XRD and thermal analysis method. On the other hand, there were positive linear and exponential relationship between axial compressive/splitting tensile strength and cubic compressive strength, respectively. Meanwhile, the relationship models based on the replacement of recycled aggregate were established.
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