On-line monitoring of setting and hardening of concrete

Reinhardt, Hans W.

doi:10.1617/2351580028.108

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Reinhardt et al (1996aReinhardt et al ( , 1996bReinhardt et al ( , 2000Reinhardt et al ( , 2004 evaluated changes in material properties associated with concrete aging by using the velocity of elastic waves and the energy and frequency distribution of obtained waves. However, these studies did not address how these values were related to changes in physical properties in the setting and hardening processes.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

Kamada

Uchida

Rokugo

2005

ACT

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This paper describes the relationship between the setting/hardening properties of cement paste and ultrasonic propagation characteristics from both a macroscopic and a microscopic point of view. The first experimental series was aimed at evaluating changes in the physical properties of high-early-strength cement paste. In the experiment, a single cylinder rotational viscometer was used for viscosity measurement. The second series of experiments was aimed at evaluating changes in the chemical properties of ultra-rapid-hardening cement paste. In the experiment, scanning electron microscopy (SEM) and powder X-ray diffraction analysis were done to investigate the generation of hydration products. As a result, it was confirmed that the maximum amplitude of the obtained waveform adequately reflects the changes in shear resistance of cement paste. On the other hand, change in ultrasonic wave velocity is well correlated with the formation of ettringite crystals as observed by SEM and powder X-ray diffraction analysis.

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Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

Kamada

Uchida

Rokugo

2005

ACT

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“…The maturity of the concrete is calculated using these temperatures and Equation (3). Once the maturity of the concrete is calculated, three strength‐maturity functions, that is, a Logarithmic function as per Plowman 29 (Equation 4), a hyperbolic function suggested by Bernhardt 30 and modified by Malhotra and Carino 28 (Equation 5) and an equation suggested by Hansen and Pedersen 6 (Equation 6) were curve fitted with the maturity strength data.

S = a + b \log ((), M)

S = \frac{M - M_{o}}{\frac{1}{A} + \frac{M - M_{o}}{S_{\infty}}}

S = S_{\infty} e^{- {(\frac{τ}{M})}^{α}}

where S is the strength, a and b are curve fitting parameters related to water to cement ratio and cement type, M is the maturity of concrete expressed as EA, S ∞ is the limiting strength, τ is characteristic time constant, M o an offset maturity where strength development starts and α is shape factor.…”

Section: Results and Data Analysismentioning

confidence: 99%

Use of maturity method to estimate early age compressive strength of slab in cold weather

Tekle

Al‐Deen

Anwar‐Us‐Saadat

et al. 2021

Structural Concrete

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“…Figure a shows the technical implementation such a FreshCon measurement. The design of the mortar container was taken from ref . In addition to the measurement setup, Figure b and c shows an exemplary signal and a phase picking result at this signal.…”

Section: Methodsmentioning

confidence: 99%

Bacterial Additives Improve the Water Resistance of Mortar

Ertelt

Raith

Eisinger

et al. 2020

ACS Sustainable Chem. Eng.

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The ingress of water into mortar and concrete is an ongoing problem which can reduce the lifetime of cementitious structures. Commonly used approaches that aim at preventing water ingress mainly employ an additional surface treatment after the casting process. Thus, they are time-consuming and make use of synthetic, nonsustainable additives. In contrast, it was shown recently that a biological material, i.e., a bacterial biofilm generated by B. subtilis 3610 bacteria, can be used as a bulk additive which leads to hybrid mortar with increased wetting resistance. Here, we demonstrate that a similar enhancement of the water resistance of mortar can be achieved by using different bacterial additives, i.e., wet biofilm, freeze-dried biofilm powder, and bacterial suspensions, each of which can be produced by one of three selected variants of B. subtilis bacteria. We characterize the mechanical properties of the different hybrid mortar variants regarding their setting behavior, tensile and compressive strength, and density. Our results imply that bacterial additives could be an eco-friendly and sustainable alternative to existing synthetic mortar additives.

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On-line monitoring of setting and hardening of concrete

Cited by 3 publications

References 12 publications

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

Use of maturity method to estimate early age compressive strength of slab in cold weather

Bacterial Additives Improve the Water Resistance of Mortar

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