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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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Front. Struct. Civ. Eng.    2020, Vol. 14 Issue (6) : 1573-1582    https://doi.org/10.1007/s11709-020-0680-x
RESEARCH ARTICLE
Effect of nonionic side chain length of polycarboxylate-ether-based high-range water-reducing admixture on properties of cementitious systems
Süleyman ÖZEN1, Muhammet Gökhan ALTUN2, Ali MARDANI-AGHABAGLOU2(), Kambiz RAMYAR3
1. Department of Civil Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, Yildirim-Bursa 16330, Turkey
2. Department of Civil Engineering, Faculty of Engineering, Bursa Uludag University, Nilufer-Bursa 16059, Turkey
3. Department of Civil Engineering, Faculty of Engineering, Ege University, Bornova-Izmir 35040, Turkey
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Abstract

Despite the large variations in the behaviors of water-reducing admixtures upon changes in their structures, most previous reports on the cement-admixture compatibility did not provide sufficient information on the structure of the admixture. Hence, the evaluation and generalization of the reports on the cement-admixture compatibility are challenging. In this study, three different polycarboxylate-ether-based water-reducing admixtures with the same free nonionic content, anionic/nonionic molar ratio, and main chain length and different side chain lengths were produced. The compatibility of these admixtures with a CEM I 42.5R-type cement was investigated. In addition, an analysis of variance was performed on the experiment results to evaluate the contributions of the admixture type, admixture/cement ratio, and elapsing time to the Marsh funnel flow time, mini-slump, slump flow, and compressive strength. The water-reducing admixtures having long or short side chains reduced the initial flow characteristics of the cementitious systems. However, the admixture having the shortest side chain was better with regard to flow retention. The side chain length of the admixture did not have significant effects on the compressive strength and water absorption capacity of the mortar mixtures and mini-slump performances of the cement paste mixtures. Regarding the behaviors of the admixtures in the cementitious systems, an optimal admixture side chain molecular weight is proposed.

Keywords water-reducing admixture      side chain length      cement paste      fluidity      compressive strength     
Corresponding Author(s): Ali MARDANI-AGHABAGLOU   
Just Accepted Date: 10 November 2020   Online First Date: 03 December 2020    Issue Date: 12 January 2021
 Cite this article:   
Süleyman ÖZEN,Muhammet Gökhan ALTUN,Ali MARDANI-AGHABAGLOU, et al. Effect of nonionic side chain length of polycarboxylate-ether-based high-range water-reducing admixture on properties of cementitious systems[J]. Front. Struct. Civ. Eng., 2020, 14(6): 1573-1582.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-020-0680-x
https://academic.hep.com.cn/fsce/EN/Y2020/V14/I6/1573
item content (%)
SiO2 18.86
Al2O3 5.71
Fe2O3 3.09
CaO 62.70
MgO 1.16
SO3 2.39
Na2O+0.658K2O 0.92
Cl 0.01
insoluble residue 0.32
loss of ignition 3.20
free CaO 1.26
Tab.1  Chemical composition of the cement
time compressive strength (MPa)
1-d 14.7
2-d 26.8
7-d 49.8
28-d 58.5
Tab.2  Mechanical properties of the cement
physical properties value
specific gravity 3.15
blaine specific surface (cm2/g) 3530
residual on 0.045 mm sieve (%) 7.6
Tab.3  Physical properties of the cement
type anionic monomer type anionic/non-ionic group ratio
(mol/mol)a)
free non-ionic group (mol)a) molecular weight
(kg/mol)
main chain lengtha) side chain molecular weight
(g/mol)b)
PCE-SC1000 carboxylate 3.47 2.78 23 21k 1000
PCE-SC2400 carboxylate 3.47 2.78 48 21k 2400
PCE-SC3000 carboxylate 3.47 2.78 60 21k 3000
Tab.4  Characteristics of HRWR admixtures
Fig.1  Marsh funnel flow times of cement pastes.
admixture/cement ratio (by weight %) mini slump (cm) temperature (˚C)
PCE-SC1000 PCE-SC2400 PCE-SC3000 PCE-SC1000 PCE-SC2400 PCE-SC3000
0.75 8.0 10.0 8.5 27.2 29.6 29.2
1.00 12.5 16.3 13.8 29.4 29 28.3
1.25 15.8 16.5 16.5 27.6 28.8 27.8
1.50 17.5 17.5 17.8 27.5 28.4 27.4
1.75 17.5 17.0 17.5 26.5 28.1 26.6
2.00 18.0 17.5 16.5 26.1 27.8 26.3
2.25 18.2 17.5 16.6 26.3 27.7 26.3
Tab.5  Time-dependent flow value and V-funnel flow time of mortar mixtures
mixture admixture dosage (%) time dependent flow value (cm) V-funnel flow time (s)
0 min 15 min 30 min 45 min 60 min 0 min 15 min
PCE-SC1000 0.60 25.8 22.0 21.0 20.0 19.0 9.25 blocked
PCE-SC2400 0.60 27.0 22.5 20.5 19.5 18.3 6.37 blocked
PCE-SC3000 0.60 26.8 22.0 20.5 19.8 19.0 11.04 blocked
Tab.6  Time-dependent flow value and V-funnel flow time of mortar mixtures
Fig.2  Flow retention of mortar mixtures.
Fig.3  Compression strength of mortar mixtures containing HRWR admixtures.
Fig.4  Water absorption of 28-d mortars containing HRWR admixtures
parameters sum of squares (SS) degrees of freedom (df) variance (V) F P value contribution (%)
admixture type 396.730 2 198.365 95.328 3.07E−7 19.03
admixture/cement ratio 1666.959 5 333.392 160.218 3.29E−9 79.97
error 20.809 10 2.081 1.00
total 2084.498 17 100
Tab.7  Results of ANOVA for Marsh funnel flow time in cement paste mixtures
parameters sum of squares (SS) degrees of freedom (df) variance (V) F P value contribution (%)
admixture type 2.340 2 1.170 1.364 0.293 1.19
admixture/cement ratio 184.670 6 30.778 35.881 5.53E−7 93.60
error 10.293 12 0.858 5.22
total 197.303 20 100
Tab.8  Results of ANOVA for mini-slump in cement paste mixtures
parameters sum of squares (SS) degrees of freedom (df) variance (V) F P value contribution (%)
admixture type 0.012 2 0.006 0.030 0.971 0.01
elapsing time 110.751 4 27.688 138.323 2.04E−7 98.56
error 1.601 8 0.200 1.42
total 112.364 14 100
Tab.9  Results of ANOVA for slump-flow in mortar mixtures
parameters sum of squares (SS) degrees of freedom (df) variance (V) F P value contribution (%)
admixture type 5.308 2 2.654 17.955 0.003 0.33
day 1597.409 3 532.470 3602.569 3.74E−10 99.61
error 0.887 6 0.148 0.06
total 1603.604 11 100
Tab.10  Results of ANOVA of compressive strength of mortar mixtures
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