Alkali Activated Fly Ash-Based Concrete: Evaluation of Curing Process Using Non-Linear Ultrasonic Approach

被引：21

作者：

Nikvar-Hassani, Arash ^{[1
]}

Alnuaimi, Hamad N. ^{[1
]}

Amjad, Umar ^{[1
,2
]}

Sasmal, Saptarshi ^{[3
]}

Zhang, Lianyang ^{[4
]}

Kundu, Tribikram ^{[1
]}

机构：

[1] Univ Arizona, Dept Civil & Architectural Engn & Mech, Tucson, AZ 85721 USA

[2] Pacific Waves NDT LLC, Tucson, AZ 85721 USA

[3] CSIR Struct Engn Res Ctr, Special & Multifunct Struct Lab SMSL, CSIR Rd, Chennai 600113, Tamil Nadu, India

[4] Univ Arizona, Delbert R Lewis Dept Civil & Architectural Engn &, Tucson, AZ 85721 USA

来源：

JOURNAL OF NONDESTRUCTIVE EVALUATION, DIAGNOSTICS AND PROGNOSTICS OF ENGINEERING SYSTEMS | 2022年 / 5卷 / 02期

关键词：

class F fly ash; alkali activated concrete; nondestructive testing; guided waves; linear and nonlinear ultrasonic techniques; unconfined compressive strength; COMPRESSIVE STRENGTH; STRUCTURAL CONCRETE; DAMAGE ASSESSMENT; CEMENT; HYDRATION; MICROSTRUCTURE; PARAMETERS; VELOCITY; BEHAVIOR; PHASE;

D O I：

10.1115/1.4052952

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper investigates the applicability of the nondestructive testing and evaluation (NDT&E) method using ultrasonic signals to monitor the curing of alkali-activated fly ash-based concrete (AAFC). The evaluation was carried out on AAFC specimens with two different water/binder (W/B) ratios of 0.3 and 0.5 and after curing at 60 degrees C for 7, 14, and 28 days, respectively. The signals are recorded and analyzed using linear and non-linear ultrasonic techniques. The results show that the non-linear ultrasonic technique has a clear advantage over the linear ultrasonic technique when monitoring the curing of AAFC specimens with a lower W/B ratio. However, the specimens with the higher W/B ratio do not undergo proper curing and therefore do not show clear distinctions between the curing times measured from the two ultrasonic techniques. The unconfined compressive strength (UCS) of the AAFC specimens at different W/B ratios and curing times is also measured. The UCS results showed a good correlation with the ultrasonic results.

引用

页数：9

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