Comparison of ultrasonic wave reflection method and maturity method in evaluating early-age compressive strength of mortar

2006 ◽  
Vol 28 (4) ◽  
pp. 307-316 ◽  
Author(s):  
Thomas Voigt ◽  
Zhihui Sun ◽  
Surendra P. Shah
Keyword(s):  
Compressive Strength ◽  
Ultrasonic Wave ◽  
Wave Reflection ◽  
Early Age ◽  
Reflection Method ◽  
Maturity Method ◽  
Ultrasonic Wave Reflection

scholarly journals Comparative Analysis and Strength Estimation of Fresh Concrete Based on Ultrasonic Wave Propagation and Maturity Using Smart Temperature and PZT Sensors

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 559 ◽  
Author(s):  
Tareen ◽  
Kim ◽  
Kim ◽  
Park
Keyword(s):  
Phase Transition ◽  
Compressive Strength ◽  
Wave Propagation ◽  
Ultrasonic Wave ◽  
Penetration Resistance ◽  
Strength Development ◽  
Early Age ◽  
Ultrasonic Wave Propagation ◽  
Maturity Method ◽  
Concrete Maturity

Recently, the early-age strength prediction for RC (reinforced concrete) structures has been an important topic in the construction industry, relating to project-time reduction and structural safety. To address this, numerous destructive and NDTs (non-destructive tests) are applied to monitor the early-age strength development of concrete. This study elaborates on the NDT techniques of ultrasonic wave propagation and concrete maturity for the estimation of compressive strength development. The results of these comparative estimation approaches comprise the concrete maturity method, penetration resistance test, and an ultrasonic wave analysis. There is variation of the phase transition in the concrete paste with the changing of boundary limitations of the material in accordance with curing time, so with the formation of phase-transition changes, changes in the velocities of ultrasonic waves occur. As the process of hydration takes place, the maturity method produces a maturity index using the time-feature reflection on the strength-development process of the concrete. Embedded smart temperature sensors (SmartRock) and PZT (piezoelectric) sensors were used for the data acquisition of hydration temperature history and wave propagation. This study suggests a novel relationship between wave propagation, penetration tests, and hydration temperature, and creates a method that relies on the responses of resonant frequency changes with the change of boundary conditions caused by the strength-gain of the concrete specimen. Calculating the changes of these features provides a pattern for estimating concrete strength. The results for the specimens were validated by comparing the strength results with the penetration resistance test by a universal testing machine (UTM). An algorithm used to relate the concrete maturity and ultrasonic wave propagation to the concrete compressive strength. This study leads to a method of acquiring data for forecasting in-situ early-age strength of concrete, used for secure construction of concrete structures, that is fast, cost effective, and comprehensive for SHM (structural health monitoring).

Continuous strength measurements of cement pastes and concretes by the ultrasonic wave reflection method

2020 ◽  
Vol 242 ◽  
pp. 117902 ◽  
Author(s):  
Didier Lootens ◽  
Marc Schumacher ◽  
Maxime Liard ◽  
Scott Z. Jones ◽  
Dale P. Bentz ◽  
...  
Keyword(s):  
Ultrasonic Wave ◽  
Wave Reflection ◽  
Reflection Method ◽  
Cement Pastes ◽  
Ultrasonic Wave Reflection

Using ultrasonic wave reflection to monitor false set of cement paste

2017 ◽  
Vol 84 ◽  
pp. 10-18 ◽  
Author(s):  
Chul-Woo Chung ◽  
Prannoy Suraneni ◽  
John S. Popovics ◽  
Leslie J. Struble
Keyword(s):  
Ultrasonic Wave ◽  
Cement Paste ◽  
Wave Reflection ◽  
Ultrasonic Wave Reflection ◽  
False Set

scholarly journals Using the Maturity Method in Predicting the Compressive Strength of Vinyl Ester Polymer Concrete at an Early Age

2017 ◽  
Vol 2017 ◽  
pp. 1-12
Author(s):  
Nan Ji Jin ◽  
Kyu-Seok Yeon ◽  
Seung-Ho Min ◽  
Jaeheum Yeon
Keyword(s):  
Compressive Strength ◽  
Prediction Model ◽  
Vinyl Ester ◽  
Curing Temperature ◽  
Polymer Concrete ◽  
Early Age ◽  
Time Interval ◽  
Study Results ◽  
Maturity Method ◽  
Curing Age

The compressive strength of vinyl ester polymer concrete is predicted using the maturity method. The compressive strength rapidly increased until the curing age of 24 hrs and thereafter slowly increased until the curing age of 72 hrs. As the MMA content increased, the compressive strength decreased. Furthermore, as the curing temperature decreased, compressive strength decreased. For vinyl ester polymer concrete, datum temperature, ranging from −22.5 to −24.6°C, decreased as the MMA content increased. The maturity index equation for cement concrete cannot be applied to polymer concrete and the maturity of vinyl ester polymer concrete can only be estimated through control of the time interval Δt. Thus, this study introduced a suitable scaled-down factor (n) for the determination of polymer concrete’s maturity, and a factor of 0.3 was the most suitable. Also, the DR-HILL compressive strength prediction model was determined as applicable to vinyl ester polymer concrete among the dose-response models. For the parameters of the prediction model, applying the parameters by combining all data obtained from the three different amounts of MMA content was deemed acceptable. The study results could be useful for the quality control of vinyl ester polymer concrete and nondestructive prediction of early age strength.

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