Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars
This study investigated the cracking resistance of rubberized cement-based mortars. Three rubber particle sizes were used: Rubber A (major particle size 2−4 mm), Rubber B (major particle size 1−3 mm), and Rubber C (major particle size 0−2 mm). Traditional restrained rin...
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doaj-23842d6c5a534bbfbd08e738ccd4e62b2020-11-25T01:11:53ZengMDPI AGMaterials1996-19442019-09-011219313210.3390/ma12193132ma12193132Effects of Rubber Size on the Cracking Resistance of Rubberized MortarsYong Yu0Han Zhu1School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaKey Laboratory of Coast Civil Structure Safety, Tianjin University, Ministry of Education, Tianjin 300350, ChinaThis study investigated the cracking resistance of rubberized cement-based mortars. Three rubber particle sizes were used: Rubber A (major particle size 2−4 mm), Rubber B (major particle size 1−3 mm), and Rubber C (major particle size 0−2 mm). Traditional restrained ring shrinkage test (RRST), new restrained squared eccentric ring shrinkage test (RSERST), mechanical test, and scanning electron microscopy test were conducted. Results showed that the cracking inhibitory effect of Rubber B was the highest among the three rubber particle sizes. SEM results revealed that the particle size of the rubber does not have much effect on the ITZ (interfacial transition zone) position of rubber and cement paste. For the strength differences of the three types of rubberized mortar, it is mainly because the specific surface area increased as the rubber size decreased, which lead to more ITZ positions and pore structures. Our study verified that RSERST can predict the cracking position and shorten the test period. Compared with RRST, RSERST can also increase the restriction degree. <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>K</mi> <mi>R</mi> </msub> </mrow> </semantics> </math> </inline-formula> is defined as the intensification factor of RSERST restriction degree. The average intensification factor is <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mrow> <msub> <mi>K</mi> <mi>R</mi> </msub> </mrow> <mo stretchy="true">¯</mo> </mover> <mo>=</mo> <mn>1.17</mn> </mrow> </semantics> </math> </inline-formula>.https://www.mdpi.com/1996-1944/12/19/3132rubberized cement-based mortarrubber particle sizestrengthrestrained ring shrinkage testrestrained squared eccentric ring shrinkage test |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yong Yu Han Zhu |
spellingShingle |
Yong Yu Han Zhu Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars Materials rubberized cement-based mortar rubber particle size strength restrained ring shrinkage test restrained squared eccentric ring shrinkage test |
author_facet |
Yong Yu Han Zhu |
author_sort |
Yong Yu |
title |
Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars |
title_short |
Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars |
title_full |
Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars |
title_fullStr |
Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars |
title_full_unstemmed |
Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars |
title_sort |
effects of rubber size on the cracking resistance of rubberized mortars |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-09-01 |
description |
This study investigated the cracking resistance of rubberized cement-based mortars. Three rubber particle sizes were used: Rubber A (major particle size 2−4 mm), Rubber B (major particle size 1−3 mm), and Rubber C (major particle size 0−2 mm). Traditional restrained ring shrinkage test (RRST), new restrained squared eccentric ring shrinkage test (RSERST), mechanical test, and scanning electron microscopy test were conducted. Results showed that the cracking inhibitory effect of Rubber B was the highest among the three rubber particle sizes. SEM results revealed that the particle size of the rubber does not have much effect on the ITZ (interfacial transition zone) position of rubber and cement paste. For the strength differences of the three types of rubberized mortar, it is mainly because the specific surface area increased as the rubber size decreased, which lead to more ITZ positions and pore structures. Our study verified that RSERST can predict the cracking position and shorten the test period. Compared with RRST, RSERST can also increase the restriction degree. <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>K</mi> <mi>R</mi> </msub> </mrow> </semantics> </math> </inline-formula> is defined as the intensification factor of RSERST restriction degree. The average intensification factor is <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mrow> <msub> <mi>K</mi> <mi>R</mi> </msub> </mrow> <mo stretchy="true">¯</mo> </mover> <mo>=</mo> <mn>1.17</mn> </mrow> </semantics> </math> </inline-formula>. |
topic |
rubberized cement-based mortar rubber particle size strength restrained ring shrinkage test restrained squared eccentric ring shrinkage test |
url |
https://www.mdpi.com/1996-1944/12/19/3132 |
work_keys_str_mv |
AT yongyu effectsofrubbersizeonthecrackingresistanceofrubberizedmortars AT hanzhu effectsofrubbersizeonthecrackingresistanceofrubberizedmortars |
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