Synthesis of Nano C-S-H Composite Seed Early-Strength Agent by Mechanically Assisted Wet-Chemical Method

doi:10.16552/j.cnki.issn1001-1625.2025.0480

Abstract

Abstract: Sodium sulfate (Na₂SO₄) and nano calcium silicate hydrate (C-S-H) seeds can be used as early-strength agents for cement-based materials. The combination of the two can further improve the early mechanical properties of cement-based materials. In this study, analytically pure CaSO₄ and Na₂SiO₃·9H₂O were used as calcium source and silicon source, respectively, and polycarboxylate superplasticizer (PCE) was used as dispersant to prepare Na₂SO₄ and nano C-S-H composite seed early-strength agent in situ by mechanical assisted wet-chemical method. The effects of calcium-silicon molar ratio and mechanical force application time on the structure and properties of composite seed early-strength agent were investigated, and the synthesis mechanism of composite seed early-strength agent was discussed. The results show that the composite seed early-strength agent prepared by calcium-silicon molar ratio of 1.0 and mechanical force application time of 1.0 h shows lower average particle size (52.38 nm), higher stability and excellent early-strength performance. When the mechanical force application time is 1.0 h, the synergistic effect of Na₂SO₄ and nano C-S-H increases the 1 d compressive strength of high-content slag cement by 35.3%. Compared with pure nano C-S-H seed and Na₂SO₄, the addition of composite seed early-strength agent increases the 1 d compressive strength of high-content slag cement by 13.1% and 17.3%, respectively. Mechanical force can refine CaSO₄ particles, break chemical bonds, improve Ca²⁺ leaching activity, promote uniform mixing of calcium and silicon components, and collaborate with wet-chemical reactions to efficiently prepare nano composite seed early-strength agents in situ. This study can provide support for the low-cost and large-scale utilization of composite seed early-strength agents in cement-based materials.

Key words: composite seed early-strength agent, Na₂SO₄, nano C-S-H, mechanically assisted wet-chemical method

CLC Number:

TU528

YANG Lirong, YANG Shiwen, LI Shuaikang, WANG Shengqiang, ZHANG Huakang, LIU Zhigang, WANG Chunmei. Synthesis of Nano C-S-H Composite Seed Early-Strength Agent by Mechanically Assisted Wet-Chemical Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3654-3664.

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