STUDY OF THE COMBINED INFLUENCE OF CONDENSED SILICA FUME AND A WATER REDUCING ADMIXTURE ON WATER DEMAND AND STRENGTH OF CONCRETE.

被引：0

作者：

Markestad, S.A. ^{[1
]}

机构：

[1] Norwegian Inst of Technology, Trondheim, Norw, Norwegian Inst of Technology, Trondheim, Norw

来源：

Materials and Structures/Materiaux et Constructions | 1986年 / 19卷 / 109期

关键词：

CONCRETE MIXERS AND MIXING - Moisture Control - CONCRETE TESTING - Compression Tests - SILICA - Efficiency;

D O I：

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中图分类号：

学科分类号：

摘要：

In recent years condensed silica fume has been acknowledged as one of the most effective pozzolans ever added to concrete. Properly used in adequate amounts and combined with a water reducing admixture, many important qualities of concrete are achieved or secured. The principle of dosage of water reducing admixture adopted in this combination has been to dose a quantity proportional to the amount of silicate fume. The positive effect on concrete strength from this combination of admixtures has been described as an 'efficiency factor' for 1 kg silica fume between two to five when the efficiency of 1 kg cement is the unit. This study shows first that the dosing principle used until now is contradicted by experimental evidence and secondly that the water reducing admixture (lignosulfonate) used in the experimental series studied is responsible for 60% or more of the strength gain at 28 days, whereas the silica fume has to be credited for less than 40%.

引用

页码：39 / 47