Recent advances of ultrasonic testing of cement based materials at early ages

Trtnik, Gregor; Gams, Matija

doi:10.1016/j.ultras.2013.07.010

Cited by 73 publications

(29 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Phase 4, or deceleration period, is characterized by the increase values of velocity, but with a lower growth rate. In the Phase 5, or stabilization, the changes are minor, and the velocity tends to stabilize [44].…”

Section: Time Zeromentioning

confidence: 99%

Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

et al. 2016

View full text Add to dashboard Cite

The autogenous shrinkage is a phenomenon that occurs due to the appearance of tensile stresses in capillary pores. Inherent in the hydration process, not depending on external interference. In high strength concrete, autogenous shrinkage is most pronounced, due to the refinement of microstructure, the high cement content, presence of mineral addictions and low water/cement ratio, which interfere in the transport of water curing. In this context, Superabsorbent polymers (SAP) stand out for their ability to reduce or eliminate the autogenous shrinkage, because they absorb large amounts of water, which is subsequently released into the matrix, avoiding self-desiccation and the onset of tensile stresses (internal curing). However, studies show that SAP can reduce the mechanical strength, which can be compensated by addiction of Nano-silica (NS). In this paper, the effect of these additions in Time Zero (T 0 ) was evaluated. T 0 determines the time at which the material starts to behave as a solid, with the development of a rigid mineral skeleton to oppose the volumetric variations that occurs in the paste, which can lead to cracking, compromising esthetics, durability, and structures safety. The ultrasonic pulse velocity test performed the T 0 , which measures the velocity of propagation of an ultrasonic wave through the material and is taken as the time when a sudden change occurs at this velocity. Nine blends were made containing SAP and NS, where it was found that SAP addition increases the T 0 (up to 11%), while NS decrease its value (in 55%).

show abstract

Section: Time Zeromentioning

confidence: 99%

Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In this study, we used normal, f ibre and micro silica concrete with a ratio of water to cement W/C= 0.61, which their mixed design was provided in " Table-3". the samples on the 28th day were examined having different content of moisture under the test of ultrasonic and compressive strength in compliance with the standard requirements B compressive strength S 1881 (Trtnik & Gams, 2014).…”

Section: Materialsand Methodmentioning

confidence: 99%

“…4. By putting concrete samples in water and increasing moisture content, waves' speed and compressive strength have show inverse relation (Trtnik & Gams, 2014). 5.…”

Section: Materialsand Methodmentioning

confidence: 99%

The Effect of Moisture on the Strength of Concrete Sample by using Ultrasonic Device

Hassani¹,

Mashhadi²,

Shafipour³

et al. 2017

AMBI

View full text Add to dashboard Cite

show abstract

“…Recently a comprehensive review of ultrasonic shear wave reflection and compression wave transmission work has been published [24]. In this paper, we complement that work with a broader review of the application of ultrasonic reflection method to include all ultrasonic wave modes, testing configurations and buffer types for application to cement paste, mortar and concrete.…”

Section: Introductionmentioning

confidence: 96%

Review of Ultrasonic Wave Reflection Applied to Early-Age Concrete and Cementitious Materials

Popovics

Subramaniam

2014

J Nondestruct Eval

View full text Add to dashboard Cite

The ultrasonic wave reflection method, as applied to characterize early age cement-based materials, is reviewed. The topic is first introduced with a historical review of method development. The theoretical basis of the reflection technique within the context of wave mechanics is then considered, followed by a description of experimental techniques and associated requirements of testing setups. Then fundamental background information about the method is described, including effects of ultrasonic wave mode (compression and shear waves) and buffer material (metal, ceramic and polymer) on the results and required experimental apparatus. Several test application tasks, across a range of cementitious material ages (hydration states), are summarized, including determination of global constitutive properties, estimation of setting time (initial and final sets), evolution of strength, and assessment of microstructure (e.g. flocculation state in setting material and porosity in solid material). The analyses of various techniques are presented in a unified manner for elastic, viscoelastic and poroelastic idealizations of the cementitious material.

show abstract

Recent advances of ultrasonic testing of cement based materials at early ages

Cited by 73 publications

References 63 publications

Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

The Effect of Moisture on the Strength of Concrete Sample by using Ultrasonic Device

Review of Ultrasonic Wave Reflection Applied to Early-Age Concrete and Cementitious Materials

Contact Info

Product

Resources

About