The effects of shrinkage-reducing admixtures used in self-compacting concrete on its strength and durability

Demir, İlhami; Sevim, Özer; Tekin, Emrah

doi:10.1016/j.conbuildmat.2018.03.250

Cited by 39 publications

(18 citation statements)

References 25 publications

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“…3 which are about 5.4 %, 6.8 % and 5.1 % lower than those of C0 concrete. This corresponds well with the findings in many other authors 14,59 , who reported that the addition of SRA decreased the alkalinity of the pore solution in concrete and thus directly inhibiting the cement hydration to some extent, which adversely affected the strength development of concrete. -6 ), which can be also explained by the dilution effect of fly ash and its weak reactivity at early age [49][50][51] .…”

Section: Fractal Model Of Pore Structuresupporting

confidence: 92%

“…Some materials, such as fly ash 10 , fibers 1,2,11 and MgO expansive agent 12,13 are commonly used to improve the crack resistance of face slab concrete. Besides, the shrinkage-reducing admixtures (SRA) are widely reported to effectively decrease the shrinkage of concrete [14][15][16] . Some authors in China are now testing the possibility of the application of SRA in face slab concrete 17 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a controversy exists regarding the influence of the SRAs on frost resistance of concrete. Some authors suggested that SRAs should not be used in concrete in harsh freezing environments, because SRAs could negatively affect the frost resistance of concrete due to the loss of entrained air 14,19,28 . Other studies have shown that a stable air-void system in concrete can be achieved to provide desired frost resistance after incorporating SRAs 16,29 .…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

et al. 2021

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Face slab concrete suffers from serious frost damage in cold regions in China, how to improve the frost resistance of face slab concrete in cold regions is one of the important issues in concrete faced rockfill dam (CFRD) design and construction. The results in this paper indicate that the frost resistance of concrete can be improved by adding fly ash, fiber, MgO and shrinkage-reducing admixtures (SRA), and the efficiency is in the sequence: (fly ash + fiber) > fiber > fly ash > MgO > SRA. The incorporation of 0.8 kg/m 3 PVA fiber and 20 wt% fly ash together enhances the compressive strength and tensile capacity of concrete by 6-7 % at late age, whereas the addition of 6 wt% MgO or 1 wt% SRA reduces the compressive strength and tensile capacity by about 4-10 % at various ages. The Ds of concrete added with fly ash, fiber, MgO and SRA is within the range of 2.619-2.796. The frost resistance of concrete correlates linearly with the air void parameters, pore structures and Ds. The utilization of fly ash and/or PVA fiber refines and optimizes the pore structure, thus increasing Ds and improving the frost resistance. On the contrary, MgO and SRA in this study are less effective in refining the pores than PVA fiber and fly ash, thereby producing smaller Ds and relatively weaker frost resistance.

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Section: Fractal Model Of Pore Structuresupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

et al. 2021

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“…Prior studies have shown that autogenous shrinkage is the primary factor leading to the cracking of high strength concrete. Autogenous shrinkage is defined as the unrestricted volumetric deformation of concrete without loss of mass and moisture under the condition of constant temperature and sealing [2][3][4]. Autogenous shrinkage is mainly attributed to chemical reaction and 2 of 12 self-drying.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Materials on Autogenous Shrinkage Properties of Cement Based Materials

2019

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This paper presents an experimental investigation on the effect of nano-montmorillonite, carbon nanotubes, and nano calcium carbonate on autogenous shrinkage of cement based materials. Cement paste with different nano-montmorillonite dosage (1.0 wt.%, 2.0 wt.%, 3.0 wt.%), carbon nanotubes dosage (0.1 wt.%, 0.2 wt.%, 0.3 wt.%), and nano calcium carbonate dosage (1.0 wt.%, 2.0 wt.%, 3.0 wt.%) were compared with the reference group to assess the effects of nano-materials on cement paste. Results show that autogenous shrinkage of cement based materials containing nano-materials mainly occurs in the first 72 h. Nano-materials decrease the autogenous shrinkage of the investigated cement based materials at all ages. Compared with that of the reference group at the age of 168 h, the autogenous shrinkage of NM-modified cement based composites containing 3.0 wt.% NM decreased by as much as 57.4%; the autogenous shrinkage of CNTs-modified cement based composites containing 0.3 wt.% CNTs decreased by as much as 19.4%; the autogenous shrinkage of NC-modified cement based composites containing 2.0 wt.% NC decreased by as much as 17.1%. Electrochemical AC (Alternating Current) impedance spectroscopy results show that the resistance of the pore solution electrolyte of specimens containing nano-materials increases with age, and is less than that of specimens without nano-materials, which illustrates that the pore size of nano-modified cement based material is finer and autogenous shrinkage is smaller. Scanning electron microscope results show that the structure of cement matrix is denser with more hydration products by adding nano-materials. Nano-montmorillonite releases water to reduce self-drying effect during the process of hydration for its well water swelling. Carbon nanotubes have the nanometer filling effect and form a continuous network to restrain the early autogenous shrinkage of cement paste. Nano calcium carbonate not only decreases the porosity of the cement paste, but also reacts with tricalcium aluminate to generate the expanded product calcium carboaluminate for compensating autogenous shrinkage of cement paste.

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“…The shrinkage properties of concrete were closely related to the characteristics of aggregate and the water to cement ratio [35]; the higher the water to cement ratio, the larger shrinkage strain would be, while the higher stiffness of aggregate, the smaller shrinkage strain would be. In this investigation, the rubber particles were utilized to substitute the sand in SCLC.…”

Section: Discussionmentioning

confidence: 99%

Shrinkage Properties of Self-Compacting Rubber Lightweight Aggregate Concrete: Experimental and Analytical Studies

Zhou

et al. 2019

Materials

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The shrinkage properties of self-compacting rubber lightweight aggregate concrete (SCRLC) were investigated by experimental and analytical studies in this paper. Rubber particles were used to substitute the sand in SCRLC by volume and rubber particles substitution percentages were 10%, 20%, 30%, 40% and 50%. The experimental results showed that the shrinkage strains of SCRLC increased with an increase of rubber particles substitution percentage. On the basis of China Academy of Building Research model and experimental data, a predictive model for describing the shrinkage strains of SCRLC was established. After analytical study, it was revealed that rubber particles substitution percentage of 80% in SCRLC might be the upper limit of substitution percentage; if the rubber particles substitution percentage was larger than 80%, the shrinkage strains of SCRLC would exceed the limiting value stipulated in JGJ51-2002 and the durability of SCRLC would drop to a worse status.

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The effects of shrinkage-reducing admixtures used in self-compacting concrete on its strength and durability

Cited by 39 publications

References 25 publications

Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

Effect of Nano-Materials on Autogenous Shrinkage Properties of Cement Based Materials

Shrinkage Properties of Self-Compacting Rubber Lightweight Aggregate Concrete: Experimental and Analytical Studies

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