Nghiên cứu sử dụng xi măng và phụ gia khoáng để cứng hóa đất bùn nạo vét tại tỉnh Cà Mau

Abstract

Using the mixture of cement combined with mineral additives (fly ash and granulated blast furnace slag) to harden the dredged mud as a substitute for sand is essential in construction areas where natural sand is scarce. In the study, the mixtures of (cement + fly ash), (cement + granulated blast furnace slag) and (cement + granulated blast furnace slag + fly ash) were used to harden mud in the different water bodies including brackish, fresh and salt water in Ca Mau province. The stabilized dredging soil meets the technical requirements to replace the sand in ground filling. Experimental results show that using the method of hardening mud with a mixture (cement + granulated blast furnace slag + fly ash) to get very low permeability coefficient of hardened mud, K_t = 4.1×10^-8 to 5.5×10^-8 m/s, the strength of the dredging soil after hardening increased from 12.2% to 15.4% compared with that of the cement solidified sample