Tensile creep and early-age concrete cracking due to restrained shrinkage

Since ultra-high performance concrete (UHPC) is subject to large occurrence of shrinkage at early age due to its low water-to-cement ratio, the mixing of large quantities of powdered admixtures and the absence of coarse aggregates, UHPC presents large risks of shrinkage cracking caused by the restraints provided by the form and reinforcing bars. Accordingly, this study intends to evaluate the shrinkage behavior of UHPC under restrained state by performing restrained shrinkage test using ring-test. The test results reveal that increasing thickness of the inner ring increases the tensile creep at early age leading to the reduction of the average strain and residual stress of the inner ring.

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Experimental Research on The Effect of Silica Fume on Tensile Basic Creep of Early-age Concrete

The Open Civil Engineering Journal ◽

10.2174/1874149501509010997 ◽

2015 ◽

Vol 9 (1) ◽

pp. 997-1001

Author(s):

Wang Xinjie ◽

Zhu Pinghua ◽

Xia Qun

Keyword(s):

Silica Fume ◽

Experimental Research ◽

Creep Behavior ◽

Development Rate ◽

Tensile Creep ◽

Basic Creep ◽

Early Age ◽

Development Characteristic ◽

Early Age Concrete ◽

Cementing Material

The tensile creep behavior is extremely important in crack prediction and stress analysis of concrete. The main objective is investigating the effects of the silica fume on the tensile basic creep of early-aged concrete. The effect of silica fume on tensile creep was studied using lever-type tensile creep tester. Silica fume amount by weight of total cementing material was 0%, 5%, 10% and 15%. Results show that concrete exhibits larger tensile basic creep strain if loaded at early age. The development characteristic of tensile basic creep of concrete with different silica fume content is that development rate is relatively fast after loading 12h, and slowes down gradually after loading 12h. The early age tensile basic creep of concrete increases with the increasing of the content of silica fume.

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Experimental Research on the Effect of Ground Slag on Basic Tensile Creep of Early-age Concrete

The Open Construction and Building Technology Journal ◽

10.2174/1874836801509010068 ◽

2015 ◽

Vol 9 (1) ◽

pp. 68-72 ◽

Cited By ~ 1

Author(s):

Wang Xinjie ◽

Xia Qun ◽

Zhu Pinghua

Keyword(s):

Experimental Research ◽

Creep Deformation ◽

Tensile Creep ◽

Basic Creep ◽

Basic Rule ◽

Early Age ◽

Few Data ◽

Early Age Concrete

Tensile creep of concrete at early ages is one of the important factors that affect the stress of restrained and partly restrained concrete. But only few data are available on tensile creep of concrete. The effect of ground slag on tensile creep was studied using lever-type tensile creep tester. Early age tensile basic creep of concrete loaded at the age of 3 days was researched. Results show that concrete exhibits large creep deformation when loaded at the age of 3 days. And the addition of ground slag decreases the early age tensile creep of concrete and tensile creep of concrete decreases with the increase of the content of ground slag. But the basic rule of the development of basic tensile creep in concrete has not been changed.

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Thermo-mechanical simulations of early-age concrete cracking with durability predictions

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/236/1/012052 ◽

2017 ◽

Vol 236 ◽

pp. 012052 ◽

Cited By ~ 2

Author(s):

Petr Havlásek ◽

Vít Šmilauer ◽

Karolina Hájková ◽

Luis Baquerizo

Keyword(s):

Early Age ◽

Concrete Cracking ◽

Early Age Concrete

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