Comparative Analysis and Strength Estimation of Fresh Concrete

set of graphs showing temperature monitoring and development of maturity curve,
set of graphs showing temperature monitoring and development of maturity curve,

Giatec would like to recognize Najeebullah Tareen, Junkyeong Kim, Won-Kyu Kim, and Seunghee Park of Sungkyunkwan University for their incredible research regarding the strength estimation of fresh concrete based on ultrasonic wave propagation and maturity. In their academic research, they used SmartRock® sensors to access data regarding the hydration temperature history.

Abstract

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).

Read the full article here.

Leave a Reply

Your email address will not be published. Required fields are marked *

Related Articles

Use These Tech Tools for More Efficient Cold Weather Concreting

Let’s dive into our sensors in detail.   Learn More SmartRock Sensors:    SmartRock is a wireless concrete sensor designed for temperature and strength monitoring with the ability to record real-time temperature data for every 15-minute interval for 2 months and comes with remote-monitoring capabilities. It is fast, simple, designed rugged and waterproof, and can be activated and installed hassle-free. The sensor contains two points of temperature measurements located in the sensor cable and body, and comes with an extended temperature cable and probe for mass concrete purposes. This sensor can measure temperature as low as -22℉ (-30℃) with an accuracy range of ±1℃.   The SmartRock sensor, containing a black box, a…

Everything You Need to Know About Pouring Concrete in Winter

Winter is coming! Worried about the cold weather concreting that comes with it in the construction industry? We’ve got it covered with Giatec’s SmartRock sensors.  Keep reading to learn more.  Learn More The temperature is dropping, the days start to get shorter, and frost covers the ground. While it may be exciting to imagine a festive winter season, that is not what comes to mind when working in the construction industry. Especially, when you have a project to complete, a schedule to maintain, and a desired concrete temperature and strength to achieve; the pressure is on when dealing with factors like freezing of concrete at an early age, rapid temperature changes, all…

Giatec’s Unique Concrete Knowledge Resources

The Giatec Scientific website is a treasure trove of concrete knowledge, ranging from blogs and case studies to podcasts and videos! Find a few of our exclusive resources below: Learn More Giatec’s Concrete Terminology Search Bar Need a one-stop destination for searching definitions for a plethora of terms related to concrete knowledge? Make sure to check out our concrete terminology search bar! To search for a term related to cement or concrete, just type a word in the search bar. Try rebar, rodding, aggregates, cracking, or…

Essential Guide for World of Concrete!

January 18-20, 2022 | Las Vegas

Visit us at Booth #N1253

We use cookies to provide you with a better experience, analyze site traffic and assist in our marketing efforts. By continuing to use this website, you consent to the use of cookies in accordance with our Privacy Policy Page.