Preparation and Performance Influencing Factors  of Silt-Based Non-Sintered Ceramsite

Abstract

Abstract: Using dredged silt as the main raw material to prepare non-sintered ceramsite, realize the resource utilization of silt. Compared with traditional silt treatment methods, it reduces land occupation and secondary environmental pollution caused by silt stacking, and has significant advantages. The effects of silt/cement ratio, binder addition, gypsum addition and curing time on the performance of ceramsite were explored through experimental analysis. The results show that the best raw material ratio and curing process for silt-based non-sintered ceramsite is silt/cement ratio 2.5 (mass ratio), gypsum addition 10% (mass fraction), binder addition 1% (mass fraction), and curing time 28 d. The compressive strength of ceramsite prepared under these condition is 4.49 MPa, the particle density is 1.3 g·cm^-3, and the 1 h water absorption is 9.78%. Meet the performance indicators of ordinary lightweight aggregate in GB/T 17431.1—2010 "Lightweight aggregate and its test method". SEM and XRD analyses show that the internal pores of ceramsite are closed under the optimal condition, and the crystal grains are tightly combined. The C-S-H and anorthite-like crystalline structure formed by the hydration and hardening reaction are beneficial to improve the comprehensive physical properties of ceramsite.

Key words: non-sintered ceramsite, dredged silt, hydration and hardening, resource utilization, gypsum, curing time

CLC Number:

X705

GAO Peng, XU Yueqing, CAO Yun, HAN Yan, LIU Rong. Preparation and Performance Influencing Factors of Silt-Based Non-Sintered Ceramsite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 889-899.

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Preparation and Performance Influencing Factors of Silt-Based Non-Sintered Ceramsite

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