THE ROLE OF NA2OEQ RATIO ON THE FLOWABILITY AND STRENGTH DEVELOPMENT OF CEMENTITIOUS SYSTEMS IN THE PRESENCE OF A POLYCARBOXYLATE ETHER-BASED ADMIXTURE  

作　　者：Ali Mardani-Aghabaglou Burak Felekoğlu Kambiz Ramyar 

机构地区：[1]Department of Civil Engineering,Bursa UludağUniversity,Nilüfer-Bursa,Turkey [2]Department of Civil Engineering,Dokuz Eylul University,Buca-Izmir,Turkey [3]Department of Civil Engineering,Ege University,Bornova-Izmir,Turkey

出　　处：《Journal of Green Building》2019年第1期93-109,共17页绿色建筑学报（英文）

摘　　要：In this study,the effect of equivalent Na_(2)O(Na_(2)Oeq)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_(2)Oeq 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_(2)Oeq 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.

关 键 词：alkali content of cement fresh properties cement paste mortar mixture 

分 类 号：TU5[建筑科学—建筑技术科学]