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

2021 ◽  
Author(s):  
Biruk Hailu Tekle ◽  
Safat Al‐Deen ◽  
Mohammad Anwar‐Us‐Saadat ◽  
Njoud Willans ◽  
Yixia Zhang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Cold Weather ◽  
Early Age ◽  
Maturity Method

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).

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.

Prediction of early-age compressive strength of epoxy resin concrete using the maturity method

2017 ◽  
Vol 152 ◽  
pp. 990-998 ◽  
Author(s):  
Nan Ji Jin ◽  
Inbae Seung ◽  
Yoon Sang Choi ◽  
Jaeheum Yeon
Keyword(s):  
Compressive Strength ◽  
Epoxy Resin ◽  
Early Age ◽  
Maturity Method

scholarly journals In Situ Strength Assessment of Concrete using Maturity Method

2019 ◽  
Vol 9 (2) ◽  
pp. 1398-1401
Keyword(s):  
Compressive Strength ◽  
Modern Method ◽  
Maturity Index ◽  
Cold Weather ◽  
Strength Assessment ◽  
Concrete Mix Design ◽  
Maturity Method ◽  
Concrete Maturity ◽  
Best Fit

There is a necessity for a modern method to evaluate the insitu strength of concrete thereby increasing the rate of productivity in concrete industry. This method can address immediate challenges faced such as predicting right time for formwork removal, post-tensioning, at low temperatures while the strength gain of concrete is hindered, optimizing concrete mix design and cold weather protection. The temperature is measured using wireless sensor that offers a simple solution to concrete maturity monitoring. The temperature and humidity on various days is observed. The compressive strength at 1,3,7,14 and 28 day is observed. This paper includes calculation of maturity index using Nurse-Saul equation. A graph is plot between maturity index and compressive strength. The best fit strength-maturity equation is chosen based upon the obtained curve and thereby the in-situ strength of concrete is evaluated.

The Use of Maturity Method for Estimating In Situ Compressive Strength of Concrete

2020 ◽  
Vol 309 ◽  
pp. 103-107
Author(s):  
Pavel Kasal ◽  
Václav Lorenc ◽  
Werner Wenighofer
Keyword(s):  
Compressive Strength ◽  
Monitoring System ◽  
Temperature History ◽  
Early Age ◽  
Retirement Home ◽  
Construction Time ◽  
Strength Based ◽  
Maturity Method ◽  
Concrete Mix ◽  
Compressive Strength Of Concrete

This paper describes four projects which were built with the use of concrete monitoring system of early age compressive strength based on maturity method. The paper also deals with experiences and benefits which came from the usage of monitoring system in these projects. First two examples are bridge projects „Petersdorfer See“ and „Seckachtal“ from Germany. The third project is a retirement home in Germany and the last example is Czech project of office building Vlněna in Brno. Maturity methods for estimating early age compressive strength of concrete are known since the 1950s. These methods use the principle that compressive strength is related to age, temperature history and concrete mix properties. Before the use of this method, each different concrete mix in use needs to be calibrated. Then temperature and time are measured since the concrete is poured. Several systems using maturity method for estimating real time compressive strength are available on the market. The use of these systems helps to determine earliest possible time for stripping the formwork, loading the structure, application of post tensioning forces and other critical operations during the construction time.

Measurement of Early-Age Strength of Concrete

2020 ◽  
Vol 309 ◽  
pp. 98-102
Author(s):  
Jan Tichý ◽  
Pavel Kasal ◽  
Václav Lorenc ◽  
Petr Cikrle ◽  
Dalibor Kocáb
Keyword(s):  
Compressive Strength ◽  
Monitoring System ◽  
Early Age ◽  
Rebound Hammer ◽  
Nondestructive Methods ◽  
Construction Company ◽  
Maturity Method ◽  
C 30

Construction company Skanska a.s. is active in the field of reinforcement structures. Skanska finds measuring of early-age compressive strength very important because of removing of the formwork. This paper deals with three nondestructive methods for estimating compressive strength. Skanska started a collaboration with institute of building testing FAST VUT at the beginning of the year. Collaboration was focused on measuring of early-age strength of concrete with rebound hammer SilverSchmidt PC L. The paper includes the equation for calculation of compressive strength of C 30/37 XC4 from the rebound coefficient. Evaluation was done using results from rebound hammer and press value of crushed cubes. Calculated equation was compared with equation provided by producer of the hammer. This paper also deals with Concremote monitoring system, which is used for estimating early age compressive strength in the structure. This system, offered by company Doka, is based on maturity method. This paper shortly presents experiences with use of Concremote on site BD Hornomecholupska.

scholarly journals Compressive Strength Gain Behavior and Prediction of Cement-Stabilized Macadam at Low Temperature Curing

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yongli Xu ◽  
Guang Yang ◽  
Hongyuan Zhao
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
Curing Temperature ◽  
Strength Development ◽  
Construction Process ◽  
Strength Gain ◽  
Estimation Model ◽  
Maturity Method ◽  
Temperature Ranges ◽  
Natural Temperature

For cement-based materials, the curing temperature determines the strength gain rate and the value of compressive strength. In this paper, the 5% cement-stabilized macadam mixture is used. Three indoor controlled temperature curing and one outdoor natural curing scenarios are designed and implemented to study the strength development scenario law of compressive strength, and they are standard temperature curing (20°C), constant low temperature curing (10°C), day interaction temperature curing (varying from 6°C to 16°C), and one outdoor natural temperature curing (in which the air temperature ranges from 4°C to 20°C). Finally, based on the maturity method, the maturity-strength estimation model is obtained by using and analyzing the data collected from the indoor tests. The model is proved with high accuracy based on the validated results obtained from the data of outdoor tests. This research provides technical support for the construction of cement-stabilized macadam in regions with low temperature, which is beneficial in the construction process and quality control.

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