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 The effect of zeolite addition on parameters of concrete containing recycled ceramic aggregate

2018 ◽  
Vol 45 ◽  
pp. 00116
Author(s):  
Jacek Szulej ◽  
Paweł Ogrodnik
Keyword(s):  
Compressive Strength ◽  
Material Properties ◽  
Frost Resistance ◽  
Environmentally Friendly ◽  
Concrete Material ◽  
Dominant Component ◽  
Concrete Mix ◽  
Aluminous Cement ◽  
Compressive Strength Of Concrete ◽  
Zeolite Tuff

In the paper it was decided to recognize the material characteristics of concrete based on ceramic aggregate, aluminous cement with the addition of zeolite (5%, 10%, 15%) and air entraining admixture. Aggregate crushed to 2 fractions was used for designing the concrete mix : 0-4 mm, and 4-8 mm. The research involved the use of clinoptilolite derived from the zeolite tuff deposit at Sokyrnytsya (Transcarpathia, Ukraine). The dominant component in the zeolite is clinoptilolite in an amount of about 75%. The research carried out by the authors showed that the addition of zeolite, among others, increases the compressive strength of concrete, significantly improves the frost resistance, which in the case of using only aluminous cement is very low. The obtained results confirm the possibility of using the above-mentioned components, which improve the concrete material properties and are environmentally friendly.

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 The Effect of Adding Slag, Achieved from Wastewater Sludge Incineration in Fluidized-Bed Furnace, on the Quality of Concrete

2019 ◽  
Vol 1 (1) ◽  
pp. 244-250
Author(s):  
Alina Pietrzak
Keyword(s):  
Compressive Strength ◽  
Frost Resistance ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Wastewater Sludge ◽  
Hardened Concrete ◽  
Sludge Incineration ◽  
Concrete Mix ◽  
Compressive Strength Of Concrete

Abstract Due to a constant increase in generating the amount of sewage waste it is necessary to find an alternative method of its use or disposal. One of such methods can be utilization of sewage sludge in construction materials industry, particularly in concrete technology and other materials based on cement. It allows using waste materials as a passive additive (filler) or also as an active additive (replacement of part of bonding material). The article aims at presenting the analysis of the effect of adding slag, achieved from wastewater sludge incineration in sewage treatment plant, on properties and quality of concrete mix and hardened concrete. Using an experimental method, the researcher designed the composition of the control concrete mix, which was then modified by means of slag. For all concrete mixtures determined – air content with the use of pressure method and consistency measured by the use of concrete slump test. For all concrete series the following tests were conducted: compressive strength of concrete after 7, 28 and 56 days of maturing, frost resistance for 100 cycles of freezing and thawing, water absorption. The use of slag, ground once in the disintegrator, causes a decrease of in compressive strength of concrete samples in relation to the control concrete series as well as bigger decrease in compressive strength after frost resistance test.

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