Properties enhancement of super absorbent polymer (SAP) incorporated self-compacting cement pastes modified by nano silica (NS) addition

Hassan Baloch; Muhammad Usman; Syed A. Rizwan; Asad Hanif

doi:10.1016/j.conbuildmat.2019.01.096

Properties enhancement of super absorbent polymer (SAP) incorporated self-compacting cement pastes modified by nano silica (NS) addition

Hassan Baloch, Muhammad Usman^*, Syed A. Rizwan, Asad Hanif

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

In this exploratory study, the effects of nano silica (NS) on the properties of self-compacting pastes (SCPs) incorporated with superabsorbent polymer (SAP) have been investigated. NS was added to cement pastes, containing SAP, in varying amounts of 1%, 2% and 3%. SAP were found out to be successful in mitigating shrinkage in all formulations; however they were more effective in mixes without super-plasticizers (SPs). SAP particles reduced the fluidity, increased the air content and also reduced strength slightly due to the formation of macro-pores. NS was beneficial in improving the hydration attributes by increasing the mechanical strength and refining the microstructure. The denser microstructure of the NS modified pastes compensated for the macro pore formation associated with SAP incorporation, leading to strength increase. With NS, there was better bonding of the SAP particles in the matrix. The reduced Ca(OH) ₂ content in NS modified samples showed increased pozzolanic activity associated with NS in cement pastes.

Original language	English
Pages (from-to)	18-26
Number of pages	9
Journal	Construction and Building Materials
Volume	203
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.01.096
State	Published - 10 Apr 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Cement paste
Compressive strength
Nano silica
Self-compacting
Shrinkage
Superabsorbent polymer

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2019.01.096

Cite this

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title = "Properties enhancement of super absorbent polymer (SAP) incorporated self-compacting cement pastes modified by nano silica (NS) addition",

abstract = " In this exploratory study, the effects of nano silica (NS) on the properties of self-compacting pastes (SCPs) incorporated with superabsorbent polymer (SAP) have been investigated. NS was added to cement pastes, containing SAP, in varying amounts of 1%, 2% and 3%. SAP were found out to be successful in mitigating shrinkage in all formulations; however they were more effective in mixes without super-plasticizers (SPs). SAP particles reduced the fluidity, increased the air content and also reduced strength slightly due to the formation of macro-pores. NS was beneficial in improving the hydration attributes by increasing the mechanical strength and refining the microstructure. The denser microstructure of the NS modified pastes compensated for the macro pore formation associated with SAP incorporation, leading to strength increase. With NS, there was better bonding of the SAP particles in the matrix. The reduced Ca(OH) 2 content in NS modified samples showed increased pozzolanic activity associated with NS in cement pastes.",

keywords = "Cement paste, Compressive strength, Nano silica, Self-compacting, Shrinkage, Superabsorbent polymer",

author = "Hassan Baloch and Muhammad Usman and Rizwan, {Syed A.} and Asad Hanif",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

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doi = "10.1016/j.conbuildmat.2019.01.096",

language = "English",

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AU - Baloch, Hassan

AU - Usman, Muhammad

AU - Rizwan, Syed A.

AU - Hanif, Asad

PY - 2019/4/10

Y1 - 2019/4/10

N2 - In this exploratory study, the effects of nano silica (NS) on the properties of self-compacting pastes (SCPs) incorporated with superabsorbent polymer (SAP) have been investigated. NS was added to cement pastes, containing SAP, in varying amounts of 1%, 2% and 3%. SAP were found out to be successful in mitigating shrinkage in all formulations; however they were more effective in mixes without super-plasticizers (SPs). SAP particles reduced the fluidity, increased the air content and also reduced strength slightly due to the formation of macro-pores. NS was beneficial in improving the hydration attributes by increasing the mechanical strength and refining the microstructure. The denser microstructure of the NS modified pastes compensated for the macro pore formation associated with SAP incorporation, leading to strength increase. With NS, there was better bonding of the SAP particles in the matrix. The reduced Ca(OH) 2 content in NS modified samples showed increased pozzolanic activity associated with NS in cement pastes.

AB - In this exploratory study, the effects of nano silica (NS) on the properties of self-compacting pastes (SCPs) incorporated with superabsorbent polymer (SAP) have been investigated. NS was added to cement pastes, containing SAP, in varying amounts of 1%, 2% and 3%. SAP were found out to be successful in mitigating shrinkage in all formulations; however they were more effective in mixes without super-plasticizers (SPs). SAP particles reduced the fluidity, increased the air content and also reduced strength slightly due to the formation of macro-pores. NS was beneficial in improving the hydration attributes by increasing the mechanical strength and refining the microstructure. The denser microstructure of the NS modified pastes compensated for the macro pore formation associated with SAP incorporation, leading to strength increase. With NS, there was better bonding of the SAP particles in the matrix. The reduced Ca(OH) 2 content in NS modified samples showed increased pozzolanic activity associated with NS in cement pastes.

KW - Cement paste

KW - Compressive strength

KW - Nano silica

KW - Self-compacting

KW - Shrinkage

KW - Superabsorbent polymer

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VL - 203

SP - 18

EP - 26

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Properties enhancement of super absorbent polymer (SAP) incorporated self-compacting cement pastes modified by nano silica (NS) addition

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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