Performance-Based Specifications and Control of Concrete Durability

Beushausen, H.; Luco, Luis Fernández

doi:10.1007/978-94-017-7309-6

Cited by 36 publications

(7 citation statements)

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“…The gas permeability did not significantly increase with the increase in rubber content from 10% to 15%, as was previously reported by Guneyisi et al [21] and explained by the improved pore structure in the concrete as a result of the contribution of silica fume. According to the criteria for determining the quality of concrete concerning the values of the gas permeability coefficient [68], all three concrete mixtures are considered medium-quality concrete. Regarding gas permeability and according to the classification given by the RILEM recommendations [68], it can be concluded that SCC with 10% and 15% recycled rubber content can be used in structural reinforced concrete members without additional restrictions.…”

Section: Gas Permeabilitymentioning

confidence: 99%

“…According to the criteria for determining the quality of concrete concerning the values of the gas permeability coefficient [68], all three concrete mixtures are considered medium-quality concrete. Regarding gas permeability and according to the classification given by the RILEM recommendations [68], it can be concluded that SCC with 10% and 15% recycled rubber content can be used in structural reinforced concrete members without additional restrictions. The test results for the depth of penetration of water under pressure are given in Table 4.…”

Section: Gas Permeabilitymentioning

confidence: 99%

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Durability Performance and Thermal Resistance of Structural Self-Compacting Concrete Improved with Waste Rubber and Silica Fume

et al. 2023

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Waste rubber takes many years to decompose, and thus the increasing number of tires in the world can be characterised as an important environmental issue, which generated the idea of implementing crumb rubber in structural self-compacting concrete (SCC). According to previous studies, up to 15% recycled rubber and 5% silica fume can be used to achieve the required properties of SCC in reinforced structural members with congested reinforcement, both in the fresh and hardened state. Most studies have focused on investigating the mechanical properties of self-compacting rubberised concrete (SCRC), and only a small number of studies investigated the durability and thermal properties, with contradictory findings. This study aims to determine the influence of crumb rubber and silica fume on the durability and thermal properties of SCC, with an emphasis on the selection of environmental exposure classes, the safety of using such a material in reinforced concrete members, and additional serviceability and durability requirements. This was further advanced by investigating the micro-structure of hardened SCC with recycled rubber and silica fume using a scanning electron microscope (SEM). Test results indicate that the combining effect of crumb rubber and silica fume has a positive impact on the thermal and durability properties of SCC.

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Section: Gas Permeabilitymentioning

confidence: 99%

Section: Gas Permeabilitymentioning

confidence: 99%

Durability Performance and Thermal Resistance of Structural Self-Compacting Concrete Improved with Waste Rubber and Silica Fume

et al. 2023

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“…Compared with the cube test, the advantages of the cylinder are less end restraint and a more uniform distribution of stress over the cross-section; for these reasons, the cylinder strength is probably closer to the true uniaxial compressive strength of cement-based materials than the cube strength. According to all experimental data of the relation between cube and cylinder stated, the cylinder strength of hardened cement-based materials is not a constant value of 0.8 times the cube strength because it depends upon so many factors water/cement ratio, quality of sands (grading, surface texture, size, shape, strength, and stiffness), cement content and the period [2][3][4].…”

Section: The Conversion Factor Between Astm and Bs Standardsmentioning

confidence: 99%

“…Cement and polymer grouts have been used for geotechnical purposes [1] to reduce spaces and porosity between particles and enhance course soils' cohesion and bonding strength [2]. Several research studies reported [3] that cement grout is used to repair the construction items in the field [4]. Several research studies have used various types of grout material, such as a cement replacement with byproduct materials like fly ash [5,6], silica fume [7], and metakaolin [8], and the cement modified with polymers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interpreting the experimental results of compressive strength of hand-mixed cement-grouted sands using various mathematical approaches

Mahmood

Mohammed

Sihag

et al. 2021

Archiv.Civ.Mech.Eng

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Using two different test standards (ASTM and BS), the influence of five different sizes of sand on the ultimate stress (MPa) of hand-mixed cement-grouted sands modified with polymer is discussed in this study. The characteristics of cement-grouted sands modified with polymer up to 0.16% (percent weight of dry cement) were evaluated and measured in fresh and hardened conditions. Adding polymer decreased the water/cement ratio ( w∕c ) from 0.6 to 0.5, and it kept the flow time of the cement-based grout in the range of 18 to 23 s recommended by ASTM standard. Using mix proportion and curing time, adding polymer significantly increased the prismatic and cylindrical compressive strength (MPa) by 113 to 577% and 53 to 459%. Several mathematical approaches such as linear regression (LR), Nonlinear regression (NLR), multilinear regression (MLR), Artificial neural network (ANN), and M5P-tree were used to predict the compression strength of cement-grouted sand with a different size of sand, w/c, polymer content, and curing age. Based on the scatter index (SI), objective function (OBJ) assessments, and training and testing datasets, the compressive strength of the cement-grouted sands can be predicted well using NLR and ANN models. The compression strength tested using the BS standard was 71% higher than the compression strength of the same mix tested using the ASTM standard.

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“…In contrast to the single-chamber method of, e.g., Schönlin and Hilsdorf (Schönlin and Hilsdorf, 1987), the Torrent method is a two-chamber method, which ensures that the air only flows one-dimensionally into the test chamber, i.e., flows exclusively out of the component (Torrent, 1992;Jacobs, 2006). As environmental conditions such as humidity and temperature have a significant influence on the test results, these must be adequately documented and taken into account when assessing the concrete quality (Beushausen and Fernandez Luco, 2015).…”

Section: Introductionmentioning

confidence: 99%

Performance based concrete quality assessment with gas permeability testing on site

Ptacek,

Strauss,

Grba

et al. 2024

Front. Built Environ.

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In terms of sustainability and durability, performance-based design is becoming increasingly important for the quality assessment of concrete structures. Up to now, prescriptive approaches for concrete composition and processing and the determination of concrete strength on cast samples have primarily been used as quality assurance. As this does not take into account the quality and pore structure of the as-built concrete cover, which has a significant influence on durability as a protective zone against penetrating media, the conventional approach to quality control is not representative for this zone. In particular, the permeability of the concrete cover, which is largely dependent on the pore structure, is responsible for the ability of aggressive substances from the environment to ingress into the concrete and, depending on its quality, determines damage processes in the reinforced concrete, such as carbonation. For this reason, investigations to gas permeability on real structures are presented here, which include the possibilities and limitations of measuring and evaluating gas permeability as a durability indicator. Long-term observation was carried out on concrete walls of a motorway construction site, from a young concrete age of 14 days to a higher age of max. 800 days, in order to determine changes in the material structure of the surface area and to analyse their influence on the gas permeability. The concrete walls were treated in advance during hydration up to an age of 7 days with different curing times and types in order to simulate good, medium and poor concrete surfaces. Clear differences in the quality of the concrete cover could already be determined by means of gas permeability. The influence of the surface structure, the effect of the environment and the long-term development of the concrete structure on the permeability are also addressed in this work.

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Performance-Based Specifications and Control of Concrete Durability

Cited by 36 publications

References 0 publications

Durability Performance and Thermal Resistance of Structural Self-Compacting Concrete Improved with Waste Rubber and Silica Fume

Durability Performance and Thermal Resistance of Structural Self-Compacting Concrete Improved with Waste Rubber and Silica Fume

Interpreting the experimental results of compressive strength of hand-mixed cement-grouted sands using various mathematical approaches

Performance based concrete quality assessment with gas permeability testing on site

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