A Comprehensive Study on Non-Proprietary Ultra-High-Performance Concrete Containing Supplementary Cementitious Materials

Mousavinezhad, Seyedsaleh; Gonzales, Gregory J.; Toledo, William K.; Garcia, Judit M.; Newtson, Craig M.; Allena, Srinivas

doi:10.3390/ma16072622

Cited by 17 publications

(16 citation statements)

References 45 publications

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“…SCMs in concrete generally improve mechanical and durability properties through pozzolanic reactions that lead to secondary calcium silicate hydrate (CSH) production that fills pore space, improves density, and reduces permeability [10,11,[23][24][25][26]. Decreasing concrete permeability increases resistance to chloride ion penetration, which reduces the probability of reinforcing steel corrosion and extends the life expectancy of a concrete structure.…”

Section: Other Durability Issuesmentioning

confidence: 99%

“…For decades, SCMs have been used to reduce Portland cement content and mitigate durability issues such as ASR expansion, degradation caused by freezing and thawing, chloride ion penetration, and attack by sulfates in different types of concrete [1,10,11,26,33,34]. In many cases, it has been demonstrated that SCMs can also enhance mechanical properties of concrete.…”

Section: Supplamantry Cementiouos Materialsmentioning

confidence: 99%

“…In many cases, it has been demonstrated that SCMs can also enhance mechanical properties of concrete. Fly ash, GGBFS, silica fume, and natural pozzolans are some of the most commonly used SCMs in the concrete industry [10,[35][36][37]. Other SCMs, such as rice husk ash and metakaolin, have also been used in the concrete industry to partially replace Portland cement and mitigate ASR [11,[38][39][40][41].…”

Section: Supplamantry Cementiouos Materialsmentioning

confidence: 99%

“…Generally, particles with greater surface area, due to angularity or porosity, are expected to have greater water absorption. Therefore, mixtures containing natural pozzolan were expected to require a greater amount of HRWRA to achieve a given slump compared to those containing fly ash since pumicite particles have greater surface area compared to fly ash particles (Table 3) [10,11,65]. However, when comparing mixtures containing 30% natural pozzolan (mixtures P-N30-F00 and M-N30-F00) to those containing 30% fly ash (mixtures P-N00-F30 and M-N00-F30), it was observed that the pumicite mixtures in this study required less HRWRA than the fly ash mixtures to achieve a slump within the target range.…”

Section: Concrete Rheological Propertiesmentioning

confidence: 99%

“…There are several types of SCMs, such as natural pozzolans, metakaolin, or ground granulated blast-furnace slag (GGBFS) that appear to be potential alternatives to fly ash in concrete. As the effects of metakaolin and GGBFS in ultra-high performance concrete mixtures have been evaluated in previous studies conducted by the authors [10,11], a natural pozzolan (pumicite) was selected in this study since it is locally available in New Mexico, USA, where the research was conducted. In the United States, natural pozzolans have not been cost-competitive with fly ash until recently so they have not been widely used as SCMs.…”

Section: Introductionmentioning

confidence: 99%

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A Locally Available Natural Pozzolan as a Supplementary Cementitious Material in Portland Cement Concrete

Mousavinezhad,

Garcia,

Toledo

et al. 2023

Buildings

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For several decades, class F fly ash has been an attractive supplementary cementitious material, at least in part, due to its ability to reduce Portland cement consumption and mitigate alkali-silica reactions in concrete. However, fly ash availability is becoming uncertain as the energy industry decommissions coal burning power plants as it transitions to renewable energy production. This situation creates a need to identify viable and sustainable alternative supplementary cementitious materials. There are several types of supplementary cementitious materials, such as natural pozzolans, metakaolin, or ground granulated blast-furnace slag, which appear to be potential alternatives to fly ash in concrete. In this research, a locally available natural pozzolan (pumicite) was selected to replace fly ash in concrete. After conducting alkali-silica reaction tests on mortar mixtures, rheological and strength properties, shrinkage, resistance to freezing and thawing, and chloride ion permeability of concrete mixtures containing different amounts of fly ash and natural pozzolan were evaluated. The results showed that pumicite was more effective than fly ash at mitigating the alkali-silica reaction, and a pumicite content of 20% was necessary to mitigate the alkali-silica reaction. Ternary mixtures containing both pumicite and fly ash were the most effective cementitious materials combinations for mitigating the alkali-silica reaction expansion. Additionally, pumicite provided acceptable compressive strength and modulus of rupture values (greater than 4.0 MPa) that exceeded the flexural strengths provided by established mixtures containing only fly ash. Shrinkage and durability factor values for all mixtures were less than 710 μstrain and greater than 75, which are generally considered acceptable. Additionally, all mixtures with acceptable alkali-silica reaction expansions had very low chloride permeability. These results indicate that pumicite can be a reliable alternative for fly ash.

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