scholarly journals Experimental Study to Determine the Failure Criteria of Concrete at Its Early-Age

2015 ◽  
Vol 2015 ◽  
pp. 1-13
Author(s):  
Hongyan Ding ◽  
Lei Zhang ◽  
Puyang Zhang
Keyword(s):  
Compressive Strength ◽  
Constitutive Relation ◽  
Concrete Structures ◽  
Failure Criteria ◽  
Early Age ◽  
Construction Technique ◽  
Concrete Material ◽  
Axial Tensile ◽  
Mathematical Relation ◽  
Early Age Concrete

The failure criteria and the constitutive relation of materials for an early-age concrete are the most common reasons to conduct the nonlinear analysis and to assess the concrete structures during the construction stage. The delay of theoretical advancement in this field resulted into a mismatch between the rough theories and the advanced algorithms, which were adopted for the estimation and analysis of early-age concrete structures. It is often impossible to find an appropriate way to determine the failure criteria and its constitutive relation that may serve as a baseline. As a consequence, the development and the application of advanced techniques of construction, for example, early dismantling construction technique of formwork, have severely been restrained. Therefore, the study of the failure criteria and its constitutive relation of concrete materials at early-age are important. In this paper, the cubic compressive strength, the prismatic compressive strength, and the axial tensile strength are determined by carrying out a strength test on C20 concrete material at an early-age. Next, the failure criteria of C20 early-age concrete material in the octahedral stress space have been studied and analyzed by using the regression analysis and by deriving the mathematical relation.

scholarly journals Evaluation of Early-Age Concrete Compressive Strength with Ultrasonic Sensors

Sensors ◽  
2017 ◽  
Vol 17 (8) ◽  
pp. 1817 ◽  
Author(s):  
Hyejin Yoon ◽  
Young Kim ◽  
Hee Kim ◽  
Jun Kang ◽  
Hyun-Moo Koh
Keyword(s):  
Compressive Strength ◽  
Early Age ◽  
Concrete Compressive Strength ◽  
Ultrasonic Sensors ◽  
Early Age Concrete

scholarly journals Mathematical Model of Constitutive Relation and Failure Criteria of Plastic Concrete under True Triaxial Compressive Stress

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 102
Author(s):  
Liangming Hu ◽  
Shuyu Li ◽  
Junfu Zhu ◽  
Xu Yang
Keyword(s):  
Compressive Strength ◽  
Compressive Stress ◽  
Constitutive Relation ◽  
Mathematic Model ◽  
Failure Criteria ◽  
Stress Tests ◽  
True Triaxial ◽  
Triaxial Compressive Strength ◽  
Plastic Concrete ◽  
Curing Age

To establish the mathematic model of the constitutive relation and failure criteria of plastic concrete under true triaxial compressive stress, uniaxial compressive strength and true triaxial compressive strength of plastic concrete under three kinds of confining pressures with a size of 150 × 150 × 150 mm3 and a curing age of 540 days were tested, and the elastic modulus of plastic concrete with a size of 150 × 150 × 300 mm3 and a curing age of 90 days was tested. Based on the database, under uniaxial compressive stress tests and true triaxial compressive stress tests, the mathematic model of constitutive relation and the failure criteria of plastic concrete were investigated. It was observed that the strength of plastic concrete increased with confining stress. The mathematic model of constitutive relation in the form of the quartic polynomial is in good agreement with measured data. The general equations of failure criteria based on the octahedral stress-space under true triaxial compressive stress in the form of quadratic polynomial are well-fitting with experimental data. The mathematic model of constitutive relation and failure criteria of plastic concrete could provide the basis for a numerical simulation analysis of plastic concrete under true triaxial compressive stress, as well as promote the engineering application of plastic concrete.

Curing Strength Monitoring of Early-Age Concrete Based on Velocity of Guided Wave Using Embedded Plate-Type PZT Sensor Module

2013 ◽  
Vol 281 ◽  
pp. 645-648
Author(s):  
Ju Won Kim ◽  
Eun Seok Shin ◽  
Chang Gil Lee ◽  
Seung Hee Park ◽  
Seo Kinn Hong
Keyword(s):  
Compressive Strength ◽  
Wave Velocity ◽  
Steel Plate ◽  
Piezoelectric Sensor ◽  
Guided Wave ◽  
Early Age ◽  
Monitoring Method ◽  
Sensor Module ◽  
Early Age Concrete ◽  
Plate Type

In this study, a guided wave based nondestructive curing strength monitoring method is proposed to monitor the curing strength of the early-age concrete. This approach used the embedded steel plate-type PZT sensor module which was fabricated by bonding the two pieces of piezoelectric sensor to a steel plate. The steel plate provided the constant path for guided wave propagation and it protected the piezoelectric sensors from impacts and environmental variations. To measure the guided wave signals from the early-age concrete, fabricated sensor modules were landfilled at the same time with concrete placement.While the concrete was curing, guided wave signals were measured by pitch-catch method continuously at regular intervals. Wavelet transform process was performed to improve the quality of the signal by removing the signal’s noise of undesired frequencies. The TOF (Time of flight) of guidedwave was extract from de-noised signal using peak tracing algorithm to calculate the velocity of wave. The calculated wave velocity hysteresis according to the curing time was traced to analysis the pattern of variations of wave velocity. Finally, specific equations to estimate the strength of the concrete were derived using regression analysis based on the wave velocity and compressive strength from destructive compressive strength test.

Sign in / Sign up

Export Citation Format

Share Document