Solidified soil is a kind of mixture which is made of soil material, curing agent and water in proportion. After rolling, curing or solidification, its physical and mechanical properties meet the engineering requirements. Its core principle is that the physical and chemical reactions between the curing agent and the components in the soil produce cementitious substances such as calcium silicate hydrate (C-S-H), which wrap the soil particles to form a dense structure and harden the soil.
At present, solidified soil is mainly divided into rolling solidified soil, in-situ solidified soil and fluidized solidified soil, among which fluidized solidified soil is the most widely used in the market and the most potential for cement enterprises.
Fluidized solidified soil is mainly to mix the solidifying agent, soil material and water into pumpable slurry for self-leveling filling, which can shorten the backfilling period by 40-50%. The compressive strength of 28 days is 0.3-5MPa, and it can reach the upper strength in 24 hours. Typical application scenarios include: foundation pit fertilizer trench backfilling, pipe trench backfilling, karst cave filling, silt solidification, cavity filling, roadbed and embankment filling, etc.
Pumping self-leveling filling
At present, there are a large number of high-quality engineering cases of fluid solidified soil in China. For example, in the pipe gallery project of Beijing's urban sub-center, the large-scale application of 200,000m ³ fluidized solidified soil for backfilling shortens the construction period by 50% and reduces the cost by 35%; the fluidized solidified soil is used for backfilling the municipal road pipe trench in Yuxin Town, Jiaxing, which solves the problem of narrow space tamping and shortens the construction period by 40%; in addition, there are a large number of cases of backfilling the foundation pit of the subway station.
On the whole, compared with the traditional construction technology, the fluid solidified soil has overwhelming advantages in narrow space backfilling, soft soil treatment and other scenarios, and has the advantages of reducing the comprehensive cost by more than 30%, shortening the construction period by 25-50%, and greatly reducing the carbon emission intensity.
In recent years, with the rapid development of the domestic solidified soil market, the industry estimates that in 2026, the solidified soil material alone will reach 2.7-8.1 billion yuan, and the total market of construction services will exceed 20 billion yuan. At the same time, the annual compound growth rate of the domestic solidified soil market has reached more than 15%, and the overall market is still in the early stage. In the future, with the promotion of the "double carbon" policy and the utilization of solid waste resources and the continuous improvement of the industry standard system, the market will usher in an explosive period. Core raw materials of the
inorganic soft soil curing agent comprise 10-20% of cement, 20-40% of slag, 15-35% of steel slag, 10-30% of fly ash, 5-15% of carbide slag, 1-10% of desulfurized gypsum, 0.01-1% of hyper-dispersant and 0.01-2% of expanding agent. Cement enterprises rely on the core technology of grinding and the linkage between upstream and downstream industries to enter the solidified soil market.
In order to help cement enterprises cross the cycle and make green transformation, China Cement Network is scheduled to hold the 16th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and the 1st Solid Waste Comprehensive Utilization and Fluidized Solidified Soil Development Conference in Wuhan, Hubei Province, from December 3 to 4, 2026. At the same time, the "2026 Cement Kiln Co-disposal of Hazardous Waste Capacity Ranking List" was released. The conference will focus on in-depth discussions on green low-carbon transformation of cement enterprises, energy saving, carbon reduction and efficiency enhancement, solid waste disposal and comprehensive utilization of resources, research and development of green low-carbon cementitious materials and industrial application, providing comprehensive support for authoritative policy interpretation, key technology tackling and incremental market expansion for the industry.
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