Work

Improvement of the negative-temperature properties of calcium sulphoaluminate cement by three multifunctional chemical admixtures

Year: 2024

Type: article

Abstract: The construction of concrete in cold climates is associated with a significant energy consumption and an extensive carbon footprint. This is attributed to the production of raw materials and the necessity for additional measures to prevent frost damage. Finding suitable and environmental-friendly cementitious materials and admixtures for cold weather is a relatively straightforward and cost-effective solution. In this study, calcium sulphoaluminate cement (CSA) was selected, and low doses of three admixtures (lithium carbonate (Li 2 CO 3 ), calcium mitrite (Ca(NO 2 ) 2 ), and calcium chloride (CaCl 2 )) were used at low dosages to modify the properties of CSA at sub-zero temperatures. The results showed that: The addition of Li 2 CO 3 to CSA can significantly increase the early hydration of CSA, improve the early mechanical properties, shorten the curing time, and significantly reduce the content of frozen water in the pores. Ca(NO 2 ) 2 ensured the sustained late-stage development of CSA strength , which reached 90.5 MPa at −7+28 d; CaCl 2 significantly lowered the freezing point of the cement paste and also improved the mid and late-stage strength.

Source: Developments in the Built Environment

DOI: 10.1016/j.dibe.2024.100537

Authors: Hanlin Chen, Zhonghua Li, Guobing Ying

Institutions: Hohai University, Southeast University

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Climate action

Open Access status: gold

Estimated APC paid: $2,840