Abstract
For concrete under short-term loading, effect of reinforcement on concrete crack resistance capability is usually negligible; however, recent research results show that extension of this viewpoint to concrete under long-term loading (temperature variation) may be unsuitable. In order to investigate this phenomenon, this paper presents the experimental and analytical results of early-age reinforced concrete temperature stress development under uniaxial restraint. The experiments were carried out on a temperature stress testing machine (TSTM). Experimental results show that the coupling of reinforcement and concrete creep behavior influenced the concrete temperature stress development, and nearly 16% of concrete stress was reduced in the current research. Moreover, the cracking time of reinforced concrete was also delayed. Finally, based on the principle of superposition, analytical simulations of effect of reinforcement on concrete temperature stress have been performed.
Highlights
The tensile strength of concrete is relatively low and mass concrete structures after casting are prone to crack at earlyage
A temperature stress testing machine (TSTM) which was firstly developed by Springenschmid et al [4] and improved by others [5,6,7] was gradually used
Effect of reinforcement on concrete temperature stress development has been investigated and the following conclusions can be drawn in this paper: (1) A small concrete cracking stress increase was observed when slower cooling rate was applied at the cooling phase
Summary
The tensile strength of concrete is relatively low and mass concrete structures after casting are prone to crack at earlyage. Many researchers studied the early-age cracking behavior of restrained concrete with ring tests [1,2,3], the defects of this test, such as uncertain restraint degree and uncontrolled temperature history, limit its use in complex issues. To overcome these limits, a temperature stress testing machine (TSTM) which was firstly developed by Springenschmid et al [4] and improved by others [5,6,7] was gradually used. Igarashi et al [9] evaluated the effects of water/binder ratio and silica fume on the early-age concrete stress development
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