Abstract
In order to study the short-term creep deformation of high-strength concrete with varying fly ash replacement ratios, concrete samples with 0, 20, 35, and 50 wt% fly ash were tested using an electrohydraulic servocontrolled creep testing system and characterized using scanning electron microscopy after fracturing. Three different creep deformation behaviors were observed over time under different stress levels, namely, decelerating, isokinetic, and accelerating creep, where the creep rate increased with increasing stress. Failure of the samples occurred once isokinetic creep was achieved. The peak stress of the concrete samples exhibited a parabolic trend with increasing fly ash content, where the peak stress in the 0, 20, 35, and 50 wt% samples during short-term gradation loading creep testing was 13.08%, 7.94%, 15.14%, and 14.50% lower, respectively, than the peak stress measured in conventional uniaxial compression testing. The accumulated creep of the samples was reported and can be used as a reference for future studies on the long-term creep characteristics of concrete. The macro- and microscopic failure modes of the fly ash concrete during short-term gradation loading creep under uniaxial compression were brittle cleavage fracturing.
Highlights
In order to study the short-term creep deformation of high-strength concrete with varying fly ash replacement ratios, concrete samples with 0, 20, 35, and 50 wt% fly ash were tested using an electrohydraulic servocontrolled creep testing system and characterized using scanning electron microscopy after fracturing. ree different creep deformation behaviors were observed over time under different stress levels, namely, decelerating, isokinetic, and accelerating creep, where the creep rate increased with increasing stress
Failure of the samples occurred once isokinetic creep was achieved. e peak stress of the concrete samples exhibited a parabolic trend with increasing fly ash content, where the peak stress in the 0, 20, 35, and 50 wt% samples during shortterm gradation loading creep testing was 13.08%, 7.94%, 15.14%, and 14.50% lower, respectively, than the peak stress measured in conventional uniaxial compression testing. e accumulated creep of the samples was reported and can be used as a reference for future studies on the long-term creep characteristics of concrete. e macro- and microscopic failure modes of the fly ash concrete during short-term gradation loading creep under uniaxial compression were brittle cleavage fracturing
Continued research and Advances in Civil Engineering practical implementation have contributed to the development of novel concrete materials with high strength and high or ultrahigh performance, such as fly ash concrete, slag concrete, and fiber concrete [8–13]. e development of concrete materials and technologies has led to advancements in deep underground space engineering. ese scientific and technological research achievements are relevant to mine sidewalls and roadway supports [14–19]
Summary
Bing Li ,1 Lianying Zhang ,1 Hai Pu ,2,3 Xianbiao Mao ,2,3 Peitao Qiu ,1 Zhong Zhao ,1 and Chao Ma 1. E macro- and microscopic failure modes of the fly ash concrete during short-term gradation loading creep under uniaxial compression were brittle cleavage fracturing. Is study aimed to evaluate the short-term creep deformation of high-strength concrete with varying fly ash replacement ratios using the gradation loading test method. Ree samples of cement with each fly ash replacement ratio were prepared for the uniaxial compression test and the gradation loading creep test. Uniaxial compression testing was conducted before the stepwise creep loading test to determine the conventional uniaxial compressive peak strength of concrete with each fly ash replacement ratio (Table 3). E gradation loading test method was used to evaluate creep deformation, where the specimen was loaded at a rate of 3 kN/s to 30% of its uniaxial compressive peak strength, held for 30 min, and unloaded. The samples were dried and sprayed with gold (SBC-12 Ion Sputter Coater)
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