Influence of sodium silicate powder silica modulus for mechanical and chemical properties of dry-mix alkali-activated slag mortar

被引：101

作者：

Luukkonen, Tero ^{[1
]}

Sreenivasan, Harisankar ^{[1
]}

Abdollahnejad, Zahra ^{[1
]}

Yliniemi, Juho ^{[1
]}

Kantola, Anu ^{[2
]}

Telkki, Ville-Veikko ^{[2
]}

Kinnunen, Paivo ^{[1
]}

Illikainen, Mirja ^{[1
]}

机构：

[1] Univ Oulu, Fibre & Particle Engn Res Unit, POB 4300, FI-90014 Oulu, Finland

[2] Univ Oulu, NMR Res Unit, Fac Sci, POB 4300, FI-90014 Oulu, Finland

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 233卷

基金：

芬兰科学院;

关键词：

Blast furnace slag; Dry-mix mortar; Geopolymer; Sodium silicate; Silica modulus; ONE-PART GEOPOLYMER; FLY-ASH; MICROSTRUCTURAL DEVELOPMENT; COMPRESSIVE STRENGTH; SHRINKAGE PROPERTIES; EARLY HYDRATION; PORE SOLUTION; SI-29; NMR; WORKABILITY; REACTIVITY;

D O I：

10.1016/j.conbuildmat.2019.117354

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Sodium silicate powders with different SiO2/Na2O (silica modulus) were characterized by solubility rate, pH, and chemical structure (by Si-29 MAS-NMR) and compared in the preparation of one-part (or dry-mix) alkali-activated blast furnace slag mortar. The low SiO2/Na2O indicated the beneficial presence of less-polymerized silica (Q(1) and Q(2) Si environments) and thus faster dissolution. Consequently, using sodium silicates with SiO2/Na2O of 0.9, 2.1, and 3.4 resulted 28 d compressive strengths of 103, 80, and 2 MPa, respectively, with increasing setting time and decreasing heat release in isothermal calorimetry. Adjustment of activator SiO2/Na2O from 2.1 or 3.4 to 0.9 by adding NaOH powder resulted increased or decreased mechanical properties of mortar, respectively, depending on the initial silica modulus. These properties were not, however, similar to those obtained with sodium silicate having SiO2/Na2O of 0.9 originally. Depending on the case, the added NaOH can be consumed for dissolving sodium silicate activator, slag, or the forming (C,N)-(A)-S-H gel. (C) 2019 Elsevier Ltd. All rights reserved .

引用

页数：10

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