Abstract

Tensile creep is an important parameter to evaluate cracking probability of high‐strength concrete (HSC) structure, and the mineral admixtures have great effect on it. In this paper, the early‐age tensile basic creep behaviors of HSC containing fly ash (FA) and blast furnace slag (BS) were investigated by experiments, and the influences of loading age and stress level (stress‐strength ratio of initial loading) were evaluated. The results showed that FA promoted the early‐age tensile basic creep while BS inhibited the early‐age tensile creep. Moreover, the influence of loading age on early‐age tensile basic creep of HSC was more significant, and the affected ages’ duration was longer than that of plain concrete. The early‐age tensile basic creep of HSC containing admixtures also showed linear creep characteristic after a certain age as HSC without admixtures, and the linear characteristic was more obvious at a later loading age. The tensile basic creep velocity of HSC containing FA was the highest, while HSC containing BS exhibited the lowest velocity. The influence of admixtures on velocities of tensile basic creep was gradually attenuated with the age growth in holding period.

Highlights

  • Creep plays an important role on the cracking resistance of concrete because it can relieve the stress and help to reduce the cracking potential of the concrete structure at the early age [1, 2]. erefore, concrete creep, especially tensile creep, is an important parameter to evaluate cracking probability of the concrete structure [3,4,5,6,7], and it is one of the key characteristics that determine the internal stress development of constrained structures [8]

  • The research objective of this paper is to study the early-age tensile creep behaviors of high-strength concrete (HSC) containing mineral admixtures by using this device. e in uence of loading age, stress level, and mineral admixtures on earlyage tensile basic creep of HSC was tested and discussed

  • Mix Proportion of Concrete. e mix proportion of HSC in this paper is shown in Table 3. e slump ow of concrete mixture was controlled at 530 + 30 mm, which was in accordance with Chinese Standard JGJ/T 10-2011 (Technical Speci cation for Construction of Concrete Pumping)

Read more

Summary

Introduction

Creep plays an important role on the cracking resistance of concrete because it can relieve the stress and help to reduce the cracking potential of the concrete structure at the early age [1, 2]. erefore, concrete creep, especially tensile creep, is an important parameter to evaluate cracking probability of the concrete structure [3,4,5,6,7], and it is one of the key characteristics that determine the internal stress development of constrained structures [8]. Total strain εtotal of concrete under sustained loads is represented in Figure 2 [1, 2, 25, 26] and in the following equation: εtotal εelastic + εT + εas + εtensile creep. The basic creep strain εtensile creep can be calculated with the following equation: εtensile creep εtotal − εelastic − εT − εas. Ese studies indicated that the device could successfully measure the early-age tensile creep of concrete. Based on this observation, the research objective of this paper is to study the early-age tensile creep behaviors of HSC containing mineral admixtures by using this device. E in uence of loading age, stress level, and mineral admixtures on earlyage tensile basic creep of HSC was tested and discussed The research objective of this paper is to study the early-age tensile creep behaviors of HSC containing mineral admixtures by using this device. e in uence of loading age, stress level, and mineral admixtures on earlyage tensile basic creep of HSC was tested and discussed

Raw Materials and Mixture Proportion
Tensile Creep Test
Results and Discussion
Conclusions e following conclusions can be obtained based on this study:
Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call