Transition zone studies of new-to-old concrete with different binders

Li, Gengying; Xie, Heping; Guang-jing, Xiong

doi:10.1016/s0958-9465(01)00002-6

Cited by 81 publications

(31 citation statements)

References 2 publications

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“…He n c e , t h e i n t e r f a c i a l r e g i o n i s g e n e r a l l y r e g a r d e d a s t h e ' we a k l i n k ' i n c o n c r e t e [23][24][25][26][27][28]. In fact, the microscopic structure of RAC is much more complicated than that of normal concrete.…”

Section: Discussionmentioning

confidence: 99%

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Tam

2008

Construction and Building Materials

261

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Recycling demolished concrete as recycled aggregate can be applicable to most construction applications. Lower-grade applications, including sub-base and roadwork, have been practicing in many countries; however, higher-grade activities are rarely discussed. This paper develops two mixing approaches by adding silica fume into certain percentages of Recycled Aggregate (RA) in the pre-mix procedure, named as Two-Stage Mixing Approach (silica fume) (TSMA s ) and adding silica fume and proportional amounts of cement into certain percentages of RA in the first mix, named as Two-Stage Mixing Approach (silica fume and cement) (TSMA sc ). Experimentation highlights that improvements have been recorded resulted from the use of various RA percentages from both TSMA s and TSMA sc . The additions of silica fume and proportional cement content in the pre-mix on TSMA s and TSMA sc can fill up the weak areas in the RA and thus develop a stronger interfacial layer around aggregate, and hence a higher strength of the concrete. It, thus, concludes that TSMA s and TSMA sc can provide alternative methodologies for further improvement in quality of this recyclable material.

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Section: Discussionmentioning

confidence: 99%

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Tam

2008

Construction and Building Materials

261

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“…The failure will probably occur through this zone. The interfacial zone of FOM-to-substrate is more dense and uniform, and few cracks and interfacial transition zones were observed ( Fig.15): chemically, the silica fume reacts pozzolanically with calcium hydroxide produced by the hydration of cement to produce a greater solid volume of calcium silicate hydrate gel, leading to an additional reduction in capillary porosity and decreases the calcium hydroxide (weak large crystal) content in the matrix Chorinsky 1996, Li and Xiong 2001, Jolio and al. 2004.…”

Section: Bond Characterizationmentioning

confidence: 99%

“…This film may limit the FLM sample from drying out and, therefore, from surface micro-cracking. On the contrary, micro-cracks on the skin of the FOM sample, due to sample drying out, would be responsible for the damage initiation (Pascal et al 2004, Li et al 2001.…”

Section: Compression Testsmentioning

confidence: 99%

“…The property enhancement of fiber-reinforced mortar can be largely attributed to the crack bridging forces provided by the fibers which limit crack opening and distribute the stresses to the nearby matrix, thus suppressing strain localization. Consequently, the strength and strain capacity of the composite are increased appreciably (Chorinsky 1986, Li et al 2001.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behaviour of repair mortars

Alliche

Mallat²

2012

European Journal of Environmental and Civil Engineering

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“…Pan (1995, 1999) conducted extensive tests on concrete repairs considering the effects of material properties, surface conditions, geometry, loading, and material modulus mismatch. Considering the importance of the interfacial zone in bonding, Li, Xie, and Xiong (2001) studied the bonding by observing the microstructures of interfacial zone of new-to-old concrete system. Because of close mechanical properties and thus good compatibility to substrate concrete and low cost (Morgan, 1996), ordinary Portland cement mortar has been largely used as repairing material.…”

Section: Introductionmentioning

confidence: 99%

Tensile Bond Between Substrate Concrete and Normal Repairing Mortar under Freeze–Thaw Cycles

Qian¹,

Zhang²,

Ueda³

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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Concrete patch repair has long been used to repair the damaged concrete structures. In cold regions, freezethaw cycle is one of the major damage factors. Not only the material itself is damaged by freeze-thaw cycles, but also the adhesive interface, which is regarded as the weakest part of composite system, degrades under freeze-thaw cycles. Air entraining agent has long been used to increase the freeze-thaw resistance of concrete materials. However, the effect of air entraining agent on the adhesive interface under freeze-thaw cycles has not been explored. The degradation mechanism and failure mode of concrete repair system have not been studied, either. In this study, to investigate the effects of water-cement ratio of substrate concrete and air entraining agent in substrate concrete and repairing mortars, three kinds of substrate concrete were casted and repaired by two kinds of ordinary Portland cement mortar. With certain number of freeze-thaw cycles up to 150 cycles, through splitting prism test, the splitting tensile strength and failure mode of composite specimens were experimented. The relative dynamic elastic modulus and splitting tensile strength of substrate concretes and repairing mortars were obtained as well. Results showed that air entraining agent in the repairing mortar greatly influenced the adhesive tensile strength under freeze-thaw cycles. The water-cement ratio and air entraining agent of substrate concrete insignificantly affected the adhesive interface, but affected the splitting tensile strength and the freezethaw resistance of substrate concrete, and thus affected the failure mode of composite specimens.

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Transition zone studies of new-to-old concrete with different binders

Cited by 81 publications

References 2 publications

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Mechanical behaviour of repair mortars

Tensile Bond Between Substrate Concrete and Normal Repairing Mortar under Freeze–Thaw Cycles

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