Microstructural Features of Freezing and Thawing-Creep Damages for Concrete Mixed with Fly Ash

Figure 1

Electrohydraulic servo creep test system: ① Guide screw. ② Bearing plate. ③ Strain gauge. ④ Concrete. ⑤ Pressure transducer. ⑥ Oil pump system. ⑦ Cooling tower. ⑧ Electric machinery. ⑨ Track. ⑩ Strain collection device. ⑪ Controller. ⑫ Power device. ⑬ Underground space. ⑭ Bearing plate.