Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts

Superplasticizer (SP) is essential to enhance the groutability of microfine cement (MC) in civil engineering, however, combined effects of cement type, SP type, amount of SP and water-solid ratio (W/S) on engineering performance of MC are not clear currently. In this research, workability and mechan...

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Autores principales: Sha, Fei, Gu, Shijiu, Diao, Yuhong, Liu, Peng, Lou, Deli, Hu, Yan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911339/
https://www.ncbi.nlm.nih.gov/pubmed/35268979
http://dx.doi.org/10.3390/ma15051747
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author Sha, Fei
Gu, Shijiu
Diao, Yuhong
Liu, Peng
Lou, Deli
Hu, Yan
author_facet Sha, Fei
Gu, Shijiu
Diao, Yuhong
Liu, Peng
Lou, Deli
Hu, Yan
author_sort Sha, Fei
collection PubMed
description Superplasticizer (SP) is essential to enhance the groutability of microfine cement (MC) in civil engineering, however, combined effects of cement type, SP type, amount of SP and water-solid ratio (W/S) on engineering performance of MC are not clear currently. In this research, workability and mechanical properties of superplasticized microfine cement grouts (SMCG) with various SPs are evaluated systematically. Three different MCs (CEM I, CEM II/B-M and CEM III/B based on EN 197-1) and four SPs (one naphthalene-based (N), one melamine-based (M) and two polycarboxylate-based (PCE)) were used to study the effect of grout formulation. The properties investigated included rheological behavior (mini-slump, flowability, time-dependent viscosity and initial viscosity), fresh-state property (bleeding, effective W/S and final setting time), mechanical performance (shrinkage, flexural strength (FS), unconfined compressive strength (UCS), and FS/UCS) and microstructure. The new method of static viscosity was adopted and viscoelasticity was evaluated. The ranges of W/S and SP content were 1.0–2.0 and 0–2.5%, respectively. The results show that the dispersion effects of SP on rheological behavior were followed by PCE, M and N in order of the influence degree. The instability, long-setting and oversaturation were easily caused by excessive SP. SP could be helpful for improving FS or bending toughness. Considering workability and mechanical performance of SMCG, the W/S is suggested to be within 1.5, the optimal amounts of N, M and PCE are recommended as 1.5–2.0%, 1.2–1.5% and 0.9–1.2%, respectively.
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spelling pubmed-89113392022-03-11 Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts Sha, Fei Gu, Shijiu Diao, Yuhong Liu, Peng Lou, Deli Hu, Yan Materials (Basel) Article Superplasticizer (SP) is essential to enhance the groutability of microfine cement (MC) in civil engineering, however, combined effects of cement type, SP type, amount of SP and water-solid ratio (W/S) on engineering performance of MC are not clear currently. In this research, workability and mechanical properties of superplasticized microfine cement grouts (SMCG) with various SPs are evaluated systematically. Three different MCs (CEM I, CEM II/B-M and CEM III/B based on EN 197-1) and four SPs (one naphthalene-based (N), one melamine-based (M) and two polycarboxylate-based (PCE)) were used to study the effect of grout formulation. The properties investigated included rheological behavior (mini-slump, flowability, time-dependent viscosity and initial viscosity), fresh-state property (bleeding, effective W/S and final setting time), mechanical performance (shrinkage, flexural strength (FS), unconfined compressive strength (UCS), and FS/UCS) and microstructure. The new method of static viscosity was adopted and viscoelasticity was evaluated. The ranges of W/S and SP content were 1.0–2.0 and 0–2.5%, respectively. The results show that the dispersion effects of SP on rheological behavior were followed by PCE, M and N in order of the influence degree. The instability, long-setting and oversaturation were easily caused by excessive SP. SP could be helpful for improving FS or bending toughness. Considering workability and mechanical performance of SMCG, the W/S is suggested to be within 1.5, the optimal amounts of N, M and PCE are recommended as 1.5–2.0%, 1.2–1.5% and 0.9–1.2%, respectively. MDPI 2022-02-25 /pmc/articles/PMC8911339/ /pubmed/35268979 http://dx.doi.org/10.3390/ma15051747 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sha, Fei
Gu, Shijiu
Diao, Yuhong
Liu, Peng
Lou, Deli
Hu, Yan
Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title_full Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title_fullStr Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title_full_unstemmed Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title_short Workability and Mechanical Properties of Superplasticized Microfine Cement Grouts
title_sort workability and mechanical properties of superplasticized microfine cement grouts
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911339/
https://www.ncbi.nlm.nih.gov/pubmed/35268979
http://dx.doi.org/10.3390/ma15051747
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