Freeze–thaw cycle test and damage mechanics models of alkali-activated slag concrete

✍ Scribed by Yawei Fu; Liangcai Cai; Wu Yonggen

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 548 KB
• Volume: 25
• Category: Article
• ISSN: 0950-0618
• DOI: 10.1016/j.conbuildmat.2010.12.006

✦ Synopsis

Alkali-activated slag concrete (ASC) was prepared by using slag and Na 2 SiO 3 , NaOH complex activator. Freeze-thaw resistance, microstructure, performance mechanism, inner freeze-thaw damage distribution and mechanics models of ASC were investigated by freeze-thaw cycle, SEM and EDS tests. The experimental results show that ASC has excellent freeze-thaw resistance with frost-resisting grade of F300 at lowest; hydration products of ASC are mostly C-S-H(I) with low Ca/Si, alkaline aluminosilicate and zeolite mineral, it does not have Ca(OH) 2 and transition strip, compact degree and uniformity of structure are better, and its high compressive strength (90 MPa) also makes high freeze-thaw resistance, therefore, ASC has excellent freeze-thaw durability; freeze-thaw damage mechanics models of ASC were established by using relative dynamic elasticity modulus, dynamic elasticity modulus attenuation model is superior to accumulative freeze-thaw damage model, power function model is superior to exponential function model with better precision and relativity, and the models can reflect freeze-thaw damage rule and degree accurately.