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      THE ROLE OF NA 2O EQ RATIO ON THE FLOWABILITY AND STRENGTH DEVELOPMENT OF CEMENTITIOUS SYSTEMS IN THE PRESENCE OF A POLYCARBOXYLATE ETHER-BASED ADMIXTURE

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          Abstract

          In this study, the effect of equivalent Na 2O (Na 2O eq) ratio of cement on fresh properties and compressive strength of paste and mortar mixtures containing polycarboxylate ether-based high range water reducing (HRWR) admixture was investigated. A low and a high alkali cement were used. Five mixtures having five different Na 2O eq ratios were prepared with increasing alkali content of the cement by incorporating three different amounts of NaOH solution to the low alkali cement-bearing mixtures. Irrespective of the absence or presence of HRWR, Na 2O eq content of the mixtures was found to have a considerable adverse effect on the fresh properties of the mixtures, particularly on their flow loss. NaOH addition increased 1-day compressive strength of the mortar mixtures, however, reduced the compressive strength at later ages. In spite of having a lower fineness and a longer setting time, low alkali cement showed slightly higher 1-day strength than high alkali cement. This seems to have occurred, to some extent, from the higher HRWR admixture demand (0.4 wt.%) of the high alkali cement-bearing mixture than that of the mix containing low alkali cement (0.25 wt.%). At later ages, both of the cements showed equivalent strength values.

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          Most cited references 28

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          Interaction of polycarboxylate-based superplasticizers with cements containing different C3A amounts

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            Compatibility between superplasticizer admixtures and cements with mineral additions

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              Compatibility of superplasticizers with different cements

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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Winter 2019
                : 14
                : 1
                : 93-110
                Author notes

                1. Department of Civil Engineering, Bursa Uludağ University, Nilüfer-Bursa, Turkey

                (Corresponding author: ali.mardani16@ 123456gmail.com )

                2. Department of Civil Engineering, Dokuz Eylul University, Buca-Izmir, Turkey

                3. Department of Civil Engineering, Ege University, Bornova-Izmir, Turkey

                Article
                jgb.14.1.93
                10.3992/1943-4618.14.1.93
                © 2019 College Publishing
                Page count
                Pages: 18
                Product
                Categories
                RESEARCH

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