Validation of sequential pressure method for evaluation of the content of microvoids in air entrained concrete

Dąbrowski, Mariusz; Glinicki, Michał A.; Dziedzic, Kinga; Antolik, Aneta

doi:10.1016/j.conbuildmat.2019.08.014

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…As the name suggests, air-incorporated additives add air bubbles to concrete voids, improving the plasticity and workability of the material, but potentially compromising compressive strength. They are used in situations where concrete is subjected to ice and thaw, acting as a kind of reservoir where water can migrate, since when freezing the water expands, which could cause the concrete to crack [ 166 , 167 , 168 ].…”

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

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Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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“…The air content decreased to 2% in the reference concrete and 1.8% in the concrete where the RAP ratio was 100%. The decrease in compressive strength and apparent density have the same trend with increasing air content in concrete mixes (26). The compressive strengths of concretes containing RAP in certain proportions are presented in Figure 5.…”

Section: Applied Experimentsmentioning

confidence: 65%

Durability effect of reclaimed asphalt aggregate on concrete road pavement

Uygunoğlu,

Topçu,

Çinar Resuloğullari

2024

Mater. constr.

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The use of recycled aggregates instead of natural aggregates used in concrete reduces environmental pollution and concrete costs. Recycled Asphalt Pavement (RAP) aggregate used as recycled aggregate has a lower water absorption than natural aggregate due to its bituminous structure, which reduces the water requirement of fresh concrete. In this study, it was aimed to determine the optimum use of RAP particles as aggregate in concrete for read pavements and to determine their durability properties. For this purpose, RAP was used instead of crushed stone aggregate used in concrete road construction. RAP was used by replaced aggregate 0%, 25%, 50% and 100% of the crushed stone aggregate used on the concrete road. The dose of the produced concrete was 350 kg/m3 and the water/cement ratio was kept constant as 0.45. The fresh workability and air content of concretes containing RAP were determined. Compressive strength, splitting tensile strength, electrical resistivity value, accelerated corrosion test of hardened concretes were subjected to corrosion resistance, water absorption and porosity percentage, acid resistance, ultrasonic pulse rate and Scanning Electron Microscope (SEM) and X-ray Diffractometer (XRD) analyzes were determined. In the experimental results, it has been observed that the use of RAP ratio of 25% and 50% remains within the limit values for concrete pavement. It is recommended to be used on reinforced concrete roads that will be exposed to adverse environmental conditions with its high corrosion resistance, thanks to its anti-corrosion feature.

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“…The SAM number, a dimensionless empirical number, has been shown to correlate with the spacing factor calculated by the ASTM C457-16 method (36,37,(40)(41)(42)(43). Previously, researchers have validated the correlation between SAM number and total air content (41)(42)(43) and concluded that a decrease in the SAM number is observed with an increase in the air content (42,44). Boyle's law assumes a perfect equilibrium between volume change and the corresponding pressure difference measured on consolidation.…”

Section: Measurement Of Air Voids In Fresh Concretementioning

confidence: 99%

“…require a higher compaction/consolidation energy to record a significant pressure difference, their SAM number has a higher degree of uncertainty as compared to that of a high slump mixture (slump ≥ 63.5 mm or 2.5 in.). Furthermore, this uncertainty is increased by rodding as it demands higher energy compaction to achieve a radius of influence similar to that induced by vibration ( 43 ). In such cases, an “ N-Err ” or negative error is displayed as the SAM number resulting from a negative or insignificant pressure difference (when Pc1 is higher than Pc2 ).…”

Section: Measurement Of Air Voids In Fresh Concretementioning

confidence: 99%

Predicting Spacing Factor in Hardened Concrete Using the Fresh Concrete Measurements

Nikumbh

Panchmatia

Jones

2022

Transportation Research Record: Journal of the Transportation R

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Damage induced by freeze–thaw action in Portland cement concrete pavements can be minimized by ensuring the presence of a well-entrained air-void distribution within its cementitious paste. Several methods exist for assessing the air-void system in fresh concrete, principally ASTM C231-17a, ASTM C173-16, and AASHTO T 395. These methods accurately measure the fresh air content, but this alone is insufficient to assess air-void distribution parameters. ASTM C457-16 enables such an assessment but can only be performed on hardened concrete and consequently does not provide real-time assessment. Hence it was highly desirable to develop a system to accurately predict the air-void distribution properties, principally the spacing factor, of a concrete mixture, in real time, to support quality control/-assurance activities. A set of 271 observations was used to develop statistical models for predicting the spacing factor obtained by the RapidAir-based ASTM C457-16 method. The models were based on paste content and fresh concrete test measurements (predictors), for which least absolute shrinkage and selection operator regression analysis were used to select/reject variable(s). The predicted spacing factors (PSFs) obtained using these models in fresh concrete were evaluated on their ability to differentiate between a well-entrained (i.e., spacing factor <0.2 mm) and coarsely entrained (i.e., spacing factor >0.2 mm) air-void system. The PSFs from the base and final models exhibited 88.5% and 81.1% accuracy, respectively—much higher than that of the SAM number alone (48.4%). A larger fraction of the data set consisted of well-entrained spacing factor observations, which limited validation for coarsely entrained air-void systems.

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Validation of sequential pressure method for evaluation of the content of microvoids in air entrained concrete

Cited by 17 publications

References 16 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Durability effect of reclaimed asphalt aggregate on concrete road pavement

Predicting Spacing Factor in Hardened Concrete Using the Fresh Concrete Measurements

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