Long term mechanical properties of alkali activated slag

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Zhu, J.^1 ; Zheng, W.Z.^2 ; Xu, Z.Z.^1 ; Leng, Y.F.^1 ; Qin, C.Z.^1

College of Civil Engineering and Architecture, Harbin University of Science and Technology, Harbin

150080, China^1

Key Lab of Structures Dynamic Behavior and Control of the Ministry Education, Harbin Institute of Technology, Harbin

150090, China^2

关键词: Alkali activated slags;    Calcium aluminate;    Cementitious materials;    Compressive and tensile strengths;    Hydrated calcium silicates;    Hydration products;    Potassium silicates;    Splitting tensile strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012091/pdf
DOI  :  10.1088/1757-899X/292/1/012091

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This article reports a study on the microstructural and long-term mechanical properties of the alkali activated slag up to 180 days, and cement paste is studied as the comparison. The mechanical properties including compressive strength, flexural strength, axis tensile strength and splitting tensile strength are analyzed. The results showed that the alkali activated slag had higher compressive and tensile strength, Slag is activated by potassium silicate (K2SiO3) and sodium hydroxide (NaOH) solutions for attaining silicate modulus of 1 using 12 potassium silicate and 5.35% sodium hydroxide. The volume dosage of water is 35% and 42%. The results indicate that alkali activated slag is a kind of rapid hardening and early strength cementitious material with excellent long-term mechanical properties. Single row of holes block compressive strength, single-hole block compressive strength and standard solid brick compressive strength basically meet engineering requirements. The microstructures of alkali activated slag are studied by X-ray diffraction (XRD). The hydration products of alkali-activated slag are assured as hydrated calcium silicate and hydrated calcium aluminate.