高性能混凝土TAICON研究群---硬固混凝土力學行為(III)---子計畫II：骨材力學性質對TAICON硬固性質之影響(II)

(1)

Effect of Mechanical Properties of Aggregate on Behavior of Hardened TAICON Concrete (II)

NSC88-2211-E-011-035

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4mm #3

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6 cm 12 cm 24 cm

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ABSTRACT

This research uses three dif fer ent bar sizes (4 mm, #3 and #6), two embedded depths (2 db and 4 db), three concrete cov er thicknesses o f rein for cing bar (6 cm, 12 cm and 24 cm) to study their e f fe cts on the behavior o f bond failure for bars in the TAICON, normal weight and high-per fo rmanc e lightweight concret es.

Variables und er conside ration include con finement e f f ect, size ef f ect and variation of coars e and fine agg regat es. In addition, the compressive strength of conc rete, splitting tensile strength, stress-strain curv es, static/dynamic modulus of elasticity and Poisson’s ratio are also addressed.

The results show that: (1) Under dif fe rent

con finement, the maximum slip for reinfo rcing

bars in three typ es o f con cret e rang e from 2 to 4

mm. For the cases of C/db = 1.08 and 2.5, the

bond failure was in the splitting mode. For the

case o f C/db, the splitting failure mode also

prevailed fo r the high-per fo rmanc e lightweight

concr ete, but was dif f er ent from the pr edicted

values by OJB model. Other bond failures

were in the pull-out modes; (2) When the fine

aggreg ate is the finest one (FM = 2.63), the

concr ete incorpor ating the finer co arse aggreg ate

(10 mm) had a higher bond stress ratio than that

of the larger co arse agg regat e (20 mm). This

situation is absent when a coa rser f ine

aggreg ates (FM = 3.06) was used; (3) The

existence o f siz e e f f ect betw een the con cr ete and

the bond mechanism of bar is con firmed. The

values of k1 range f rom 1.28 to 1.40 ( l= 2 db),

and 1.93 to 2.71 ( l= 4 db), and the values of λ ₀

range form 0.073 to 0.421 ( l= 2 db), and 0.133

(2)

to 0.190 ( l= 4 db). The values increases with the increas e o f the depth of embedd edment; (4) Compared with the experimental data, the predicted bond strength with confinement e f f ect using the parameters obtained from the size-e f f e ct law was on the unconservative side.

Besides, the deviation increases with the increas e of the embeddedment depths. This indicates that there still needs a considerable rese arch e f fo rt in the area o f size ef fe ct law to predict the bond mechanism of reinfo rcing bar be for e the law can be adopted to the practical application.

Keywords: TAICON, high-per forman ce lightweight concrete, pull-out test, bond failure

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高性能混凝土TAICON研究群---硬固混凝土力學行為(III)---子計畫II：骨材力學性質對TAICON硬固性質之影響(II)

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Effect of Mechanical Properties of Aggregate on Behavior of Hardened TAICON Concrete (II)

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ABSTRACT

The results show that: (1) Under dif fe rent

con finement, the maximum slip for reinfo rcing

bars in three typ es o f con cret e rang e from 2 to 4

mm. For the cases of C/db = 1.08 and 2.5, the

bond failure was in the splitting mode. For the

case o f C/db, the splitting failure mode also

prevailed fo r the high-per fo rmanc e lightweight

concr ete, but was dif f er ent from the pr edicted

values by OJB model. Other bond failures

were in the pull-out modes; (2) When the fine

aggreg ate is the finest one (FM = 2.63), the

concr ete incorpor ating the finer co arse aggreg ate

(10 mm) had a higher bond stress ratio than that

of the larger co arse agg regat e (20 mm). This

situation is absent when a coa rser f ine

aggreg ates (FM = 3.06) was used; (3) The

existence o f siz e e f f ect betw een the con cr ete and

the bond mechanism of bar is con firmed. The

values of k1 range f rom 1.28 to 1.40 ( l= 2 db),

and 1.93 to 2.71 ( l= 4 db), and the values of λ 0

range form 0.073 to 0.421 ( l= 2 db), and 0.133

to 0.190 ( l= 4 db). The values increases with the increas e o f the depth of embedd edment; (4) Compared with the experimental data, the predicted bond strength with confinement e f f ect using the parameters obtained from the size-e f f e ct law was on the unconservative side.

Besides, the deviation increases with the increas e of the embeddedment depths. This indicates that there still needs a considerable rese arch e f fo rt in the area o f size ef fe ct law to predict the bond mechanism of reinfo rcing bar be for e the law can be adopted to the practical application.

Keywords: TAICON, high-per forman ce lightweight concrete, pull-out test, bond failure 

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Keywords: TAICON, high-per forman ce lightweight concrete, pull-out test, bond failure

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± ² ³ ´ µ ¶ · i A ' ( ) High-strength concreteHSC¸¹º»

µ¶·i !"'() High-Performance concr ete HPC¼Q !"'()½i A ¾J! ¿À! ÁÂ1eÁÃ ÄÅÆQÇ¹¹ÈeÉÊ'()Y ZjkËÌwZ\ÍÎÏÐÑPozzolanic materials &<ÐÒ<Ó½iÔeÕÖ!

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