Long-term (2 years) drying shrinkage evaluation of alkali-activated slag mortar: Experiments and partial factor analysis
Journal article, 2023

Alkali-activated slag with many excellent properties was regarded as a novel low carbon building material, has received more and more attention. This research aims to study the impacts of alkali solution (alkali content and modulus), cement and gypsum contents on compressive strength, weight loss and drying shrinkage for alkali-activated slag mortar. Gypsum used as expanding source could compensate the drying shrinkage caused by silica and alkali components in the first three months, but it has a negative impact on the strength. The mainly results can be concluded that the alkali-activated slag blended with a cement content up to 20 wt% could effectively reduce the shrinkage and weight loss and increase the strength. Furthermore, the alkali content was below 3 wt%, the specimens possess relatively lower drying shrinkage. Based on the results of the test and analysis, the partial factors of combined activation on compressive strength and drying shrinkage of alkali-activated slag mortar were put forward. In the meantime, the relationships between compressive strength and combined activation factor are liner at 28, 90 and 365 days. Compressive strength and drying shrinkage could be estimated according to the combined activation and partial factor analysis. This work could provide a reasonable method for preparing the alkali-activated slag mortar and predict the shrinkage at different periods.

Compressive strength

Partial factor analysis

Shrinkage

Alkali-activated slag mortar

Author

Shunfeng Wang

Tongji University

Chalmers, Architecture and Civil Engineering, Building Technology

Kai Wu

Tongji University

Zhenghong Yang

Tongji University

Luping Tang

Chalmers, Architecture and Civil Engineering, Building Technology

Case Studies in Construction Materials

2214-5095 (ISSN)

Vol. 18 e01956

Grön cement baserad på masugnsslagg

VINNOVA (2016-03367), 2016-11-30 -- 2020-12-31.

Subject Categories

Wood Science

Paper, Pulp and Fiber Technology

Composite Science and Engineering

DOI

10.1016/j.cscm.2023.e01956

More information

Latest update

4/13/2023