Designing concrete mixtures for strength, elastic modulus and fracture energy

Monteiro, P. J. M.; Helene, Paulo R. L.; Kang, Sung-Hoo

doi:10.1007/bf02472804

Cited by 50 publications

(24 citation statements)

References 3 publications

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“…The reference concrete proportion was established according to the method described by Monteiro et al [30]. The concrete trial mixtures were prepared using the natural fine and the natural coarse aggregates presented in Item 2.1, to have a slump of 80 ± 20 mm [31].…”

Section: Proportions Concrete Production and Testingmentioning

confidence: 99%

Microstructural analysis of recycled concrete using X-ray microtomography

Leite

Monteiro

2016

Cement and Concrete Research

159

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This paper reports an investigation of the recycled concrete (RC) microstructure using synchrotron microtomography (μCT) at the Advanced Light Source combined with Scanning Electron Microscopy analysis. The study evaluated the influence of 50% of recycled concrete aggregate (RCA) and its water absorption compensation on the RC microstructure. The following variables were studied: a) the compressive strength of the original concrete used to obtain the RCA (40 and 80MPa) and b) the initial moisture condition of the RCA (Saturated Surface Dry and Oven Dry). The microtomographic images showed the mixtures cast with RCA in the dry condition developed an evident macropore network surrounding the RCA particle that was not observed in the mixtures using RCA in the SSD condition. SEM images confirmed the initial findings from CT and showed that the thickness of the interfacial transition zone in RC is in the same order of magnitude as the reference concrete.

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Section: Proportions Concrete Production and Testingmentioning

confidence: 99%

Microstructural analysis of recycled concrete using X-ray microtomography

Leite

Monteiro

2016

Cement and Concrete Research

159

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“…Alyamaç and Ince investigated the interaction between properties of fresh SCC and hardened SCC containing marble powder. The mix design of SCC was based on a monogram approach for normal vibrated concrete developed by Monteiro et al . This method was based on three laws Abram's law; Lyse's law and Molinari's law.…”

Section: Scc Mixture Design Methodsmentioning

confidence: 99%

An overview on mixture design of self‐compacting concrete

Ashish

Verma

2018

Structural Concrete

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Self-compacting concrete (SCC) was developed in 1988 and introduced by Professor H. Okamura to achieve durability of structures with low skilled laborers. The three properties of SCC that differentiates it from traditional concrete are passing ability, filling ability and segregation resistance. The present study highlights the developments concerning SCC in the period from 1995 to 2017. This information is important for researchers and professionals working in this area. SCC can be optimized to a larger extent to find the best alternative either by use of additives or tailor-made mix design. Based on different principles and parameters, design methods can be categorized into six classes namely empirical design method, statistical factorial design method, strength-based design method, rheology of paste method, particle packing method and Eco-SCC mixture design method. To develop SCC with high quality a suitable method can be chosen depending upon the situation and application.compressive strength, design mixture method, empirical, particle packing method, rheology of paste method, self-compacting concrete 1 | INTRODUCTION SCC flows into every corner of a mold, passes reinforcement and fill gaps without any need of internal or external vibration and compaction simultaneously maintaining stability without segregation and bleeding of concrete. It has the ability to compact itself only by means of its own weight. [1][2][3][4] In the early 1990s, SCC was introduced in concrete technology. 5 The properties of SCC depend on the source and the type of constituent materials and their properties. 6 The use of SCC eliminates the compacting effort and this results in reduced costs of placement, moreover, a decrease in the duration of construction improves productivity. 7 SCC is a concrete type with high workability, a high flowability and superior resistance to segregation. 8 The property of SCC to completely fill a formwork by filling gaps and to flow around reinforcement without the need of vibration or bleeding makes it significant to use. 9 A good balance between deformability and stability resulted in the successful development of SCC. Different mix design procedures were proposed for SCC that include (a) combinations of a higher volume of mineral additives and water-reducing admixture, (b) combination of water-reducing admixture and viscosity modifying agent. 10 The use of SCC reduces the noise during casting and provides better working conditions. 7,11 The applications of SCC in densely reinforced sections, that is, columns and beams in moment-resisting frames in seismic areas is necessary to ensure that all gaps in a formwork are filled. 7 The use of limestone powder as a fine additive can improve the rheological behavior of cement pastes and the combination of both limestone powder and fly ash can result in a higher packing density. 12 Eco-SCC is a SCC with a maximum total binder content of 315 kg/m 3 which can include cement, silica fume, fly ash and/or limestone filler. 13 Air-entrained SCC was designed with the u...

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“…In figure 7, it can be observed the compressive strength test results obtained from the variation of age, w/c ratios and use of crystalline catalyst. By processing the results according to the least squares method it can be obtained the characteristic curves of the Abrams' law [23], as shown in Figure 8. From this figure, it can be noted that the use of crystalline catalyst do not hinder the concrete compressive strength.…”

Section: Compressive Strengthmentioning

confidence: 99%

Evaluation of the chloride penetration and service life of self-healing concretes activated by crystalline catalyst

Helène¹,

Guignone

Vieira

et al. 2018

Rev. IBRACON Estrut. Mater.

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The main cause of concrete structures deterioration is related to the resistance against the penetration of aggressive agents. Aiming at increase the impermeability and reduce the diffusivity of concrete elements, making it less susceptible to the ingress of chloride ions, the use of crystalline catalyst emerges as a good alternative. Its mechanism of autogenous healing enhances the natural pore-filling process of concrete. The aim of this study is to investigate the influence of the use of crystalline catalyst on the chloride ions penetration and service life prediction of concrete. For the concrete mixtures production, it was used blast-furnace slag blended cement, three different water/cement (w/c) ratios (0.45; 0.55; 0.65), with and without crystalline catalyst, totaling six different mixtures. The concrete specimens were cured in a moist chamber and tested at 28 and 91 days. It was performed tests of compressive strength, rapid chloride permeability (ASTM C1202:12), and silver nitrate colorimetric indicator. The results show that, compared to the reference mixture, the use of crystalline catalyst conserved the compressive strength and reduced the chloride ions penetration up to 30%, increasing service life up to 34%.

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Designing concrete mixtures for strength, elastic modulus and fracture energy

Cited by 50 publications

References 3 publications

Microstructural analysis of recycled concrete using X-ray microtomography

Microstructural analysis of recycled concrete using X-ray microtomography

An overview on mixture design of self‐compacting concrete

Evaluation of the chloride penetration and service life of self-healing concretes activated by crystalline catalyst

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