Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents
The freezing and thawing of construction concrete is becoming an increasingly important structural challenge. In this study, a shrinkage-compensating concrete based on a double expansive admixture was developed and its frost resistance was assessed through rapid freezing and thawing cycling. The fro...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-04-01
|
Series: | Materials |
Subjects: | |
Online Access: | https://www.mdpi.com/1996-1944/13/8/1850 |
id |
doaj-192ff878e05347d2b931ea46ba327206 |
---|---|
record_format |
Article |
spelling |
doaj-192ff878e05347d2b931ea46ba3272062020-11-25T02:02:54ZengMDPI AGMaterials1996-19442020-04-01131850185010.3390/ma13081850Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive AgentsJinjun Guo0Ting Guo1Shiwei Zhang2Yan Lu3School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaThe freezing and thawing of construction concrete is becoming an increasingly important structural challenge. In this study, a shrinkage-compensating concrete based on a double expansive admixture was developed and its frost resistance was assessed through rapid freezing and thawing cycling. The frost resistance of the concrete was derived through the measurement and calculation of the relative dynamic modulus of elasticity (RDME) and the mass loss rate (MLR), and the freezing- and thawing-cycle microstructures and products of concretes with different expansive agents were analyzed using scanning electron microscopy (SEM). It was shown that changes in the properties of the concrete under freezing and thawing could be divided into three stages: slow-damage stage, fast-damage stage, and stable stage. Compared to concrete without an expansive agent, a single-expansive-agent concrete demonstrated excellent frost resistance during the slow-damage stage, but the frost resistance rapidly decreased during the fast-damage age. After 150 cycles (the stable-damage stage), the concrete with a U-type expansive agent (UEA): MgO expansive agent (MEA) mix proportion of 2:1 had the best frost resistance, with RDME and MLR values 17.35% higher and 25.1% lower respectively, than that of an expansive-agent-free concrete. These test results provide a basis for the study of frost resistance in large-scale hydraulic concrete structures.https://www.mdpi.com/1996-1944/13/8/1850shrinkage compensating concretedouble expansive admixturerapid freezing and thawing cycles testfrost resistancerelative dynamic modulus of elasticitymass loss rate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jinjun Guo Ting Guo Shiwei Zhang Yan Lu |
spellingShingle |
Jinjun Guo Ting Guo Shiwei Zhang Yan Lu Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents Materials shrinkage compensating concrete double expansive admixture rapid freezing and thawing cycles test frost resistance relative dynamic modulus of elasticity mass loss rate |
author_facet |
Jinjun Guo Ting Guo Shiwei Zhang Yan Lu |
author_sort |
Jinjun Guo |
title |
Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents |
title_short |
Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents |
title_full |
Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents |
title_fullStr |
Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents |
title_full_unstemmed |
Experimental Study on Freezing and Thawing Cycles of Shrinkage-Compensating Concrete with Double Expansive Agents |
title_sort |
experimental study on freezing and thawing cycles of shrinkage-compensating concrete with double expansive agents |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-04-01 |
description |
The freezing and thawing of construction concrete is becoming an increasingly important structural challenge. In this study, a shrinkage-compensating concrete based on a double expansive admixture was developed and its frost resistance was assessed through rapid freezing and thawing cycling. The frost resistance of the concrete was derived through the measurement and calculation of the relative dynamic modulus of elasticity (RDME) and the mass loss rate (MLR), and the freezing- and thawing-cycle microstructures and products of concretes with different expansive agents were analyzed using scanning electron microscopy (SEM). It was shown that changes in the properties of the concrete under freezing and thawing could be divided into three stages: slow-damage stage, fast-damage stage, and stable stage. Compared to concrete without an expansive agent, a single-expansive-agent concrete demonstrated excellent frost resistance during the slow-damage stage, but the frost resistance rapidly decreased during the fast-damage age. After 150 cycles (the stable-damage stage), the concrete with a U-type expansive agent (UEA): MgO expansive agent (MEA) mix proportion of 2:1 had the best frost resistance, with RDME and MLR values 17.35% higher and 25.1% lower respectively, than that of an expansive-agent-free concrete. These test results provide a basis for the study of frost resistance in large-scale hydraulic concrete structures. |
topic |
shrinkage compensating concrete double expansive admixture rapid freezing and thawing cycles test frost resistance relative dynamic modulus of elasticity mass loss rate |
url |
https://www.mdpi.com/1996-1944/13/8/1850 |
work_keys_str_mv |
AT jinjunguo experimentalstudyonfreezingandthawingcyclesofshrinkagecompensatingconcretewithdoubleexpansiveagents AT tingguo experimentalstudyonfreezingandthawingcyclesofshrinkagecompensatingconcretewithdoubleexpansiveagents AT shiweizhang experimentalstudyonfreezingandthawingcyclesofshrinkagecompensatingconcretewithdoubleexpansiveagents AT yanlu experimentalstudyonfreezingandthawingcyclesofshrinkagecompensatingconcretewithdoubleexpansiveagents |
_version_ |
1724950760553185280 |