Factors influencing ultrasonic pulse velocity in concrete

Godinho, Jayson Pereira; Junior, Tennison Freire de Souza; Medeiros, M. H. F.; Silva, M. S. A

doi:10.1590/s1983-41952020000200004

Cited by 34 publications

(23 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The initial growth was expected, since the occurrence of hydration reactions causes a trend of water consumption and product formation, buffering the pores and decreasing the matrix voids. The same behavior was observed and justified by Godinho et al [37]. Based on the Tukey test, the series could be considered statistically equivalent in practically the whole study.…”

Section: Ultrasonic Pulse Velocity Testsupporting

confidence: 79%

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Capraro

Filho

Medeiros

2021

Rev. IBRACON Estrut. Mater.

Self Cite

View full text Add to dashboard Cite

The objective of this work was to evaluate the influence of the presence of sulfate in the microstructure and compressive strength of cement pastes. The lack of availability of more suitable aggregates, for reasons of distance or costs, sometimes leads to the use of materials that contain sulfate in their composition, which is harmful to cement mixtures. Currently, there are normative recommendations that limit the content of contaminants in the aggregates. However, there are still divergences as to the content that does not damage the concrete. In order to discuss the levels presented in the standards and the values above those allowed by them, tests were carried out on cementitious compounds contaminated by pyrite in different levels of sulfates (0.0%, 0.5%, 1.0% and 5.0% of SO3). SEM, XRD, compressive strength, ultrasonic pulse velocity and porosity analyses were performed in samples at different ages until 720 days of age. During early ages until the first year, the most contaminated samples presented an increase in their strength (1.0% and 5.0% of SO3). This behavior was explained by SEM, XRD and porosity analyses by filling the pores with products of sulfate attack, such as ettringite. At the end of the tests (720 days) the series that presented the lowest compressive strength, the presence of cracks and large amounts of ettringite was the one that had 5.0% SO3 contamination, proving the importance of a normative limit content.

show abstract

Section: Ultrasonic Pulse Velocity Testsupporting

confidence: 79%

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Capraro

Filho

Medeiros

2021

Rev. IBRACON Estrut. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This relationship has been verified by many other studies. Simple correlations (linear or exponential) can be used to estimate the compressive strength [43][44][45][46][47]. The results of this experiment also show an exponential regression relationship between compressive strength and UPV.…”

Section: Effect Of Lf and Bfs On Asmentioning

confidence: 79%

The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

2021

View full text Add to dashboard Cite

This study examines the hydration–mechanical–autogenous shrinkage–durability–sustainability properties of ternary composites with limestone filler (LF) and ground-granulated blast furnace slag (BFS). Four mixtures were prepared with a water/binder ratio of 0.3 and different replacement ratios varying from 0 to 45%. Multiple experimental studies were performed at various ages. The experimental results are summarized as follows: (1) As the replacement levels increased, compressive strength and autogenous shrinkage (AS) decreased, and this relationship was linear. (2) As the replacement levels increased, cumulative hydration heat decreased. At the age of 3 and 7 days, there was a linear relationship between compressive strength and cumulative hydration heat. (3) Out of all mixtures, the ultrasonic pulse velocity (UPV) and electrical resistivity exhibited a rapid increase in the early stages and tended to slow down in the latter stages. There was a crossover of UPV among various specimens. In the later stages, the electrical resistivity of ternary composite specimens was higher than plain specimens. (4) X-ray diffraction (XRD) results showed that LF and BFS have a synergistic effect. (5) With increasing replacement ratios, the CO2 emissions per unit strength reduced, indicating the sustainability of ternary composites.

show abstract

“…They show that, although the MgO present in these mortars formed hydration products of good strength, as the results of the mechanical tests performed on the mortars proved, the large size (low specific surface) of MgO-S0, in comparison with cement and the other MgOs, may have originated the production of mortars with high porosity. This aspect can be proved by the results from the ultrasonic pulse velocity test, since porosity is also directly linked to the transmission capacity of ultrasonic waves [ 42 ]. Mo and Panesar [ 43 ] observed that the total pore volume of cement pastes made with MgO was up to 10% higher than that of the reference paste.…”

Section: Resultsmentioning

confidence: 99%

Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder

et al. 2021

View full text Add to dashboard Cite

This paper intends to analyze the performance of mortars with reactive MgO, as a sustainable alternative to cement. Six different MgOs from Australia, Canada, and Spain were used in the production of mortars as partial substitutes for cement, namely 5%, 10%, 15%, 20%, and 25% (by weight). MgOs with different levels of reactivity were used to analyze its influence on the performance of MgO mortars. In order to evaluate the mechanical performance of these mortars, compressive strength, flexural strength, dynamic modulus of elasticity, and ultrasonic pulse velocity tests were performed. Compressive strength tests showed that the use of 25% reactive MgO can cause a decrease of this property of between 28% and 49%. The use of reactive MgO affected the other mechanical properties less. This paper also intends to analyze the durability performance of mortars with reactive MgO. To that effect, water absorption by capillarity was assessed. In this research, the effect of using MgO on the shrinkage was also analyzed. It was found that shrinkage may decrease by more than a half in some cases.

show abstract

Factors influencing ultrasonic pulse velocity in concrete

Cited by 34 publications

References 18 publications

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder

Contact Info

Product

Resources

About