Preparation and Performance Study of Large Volume Foamed Lightweight Soil for an Intelligent Networked Vehicle Test Site

Abstract

The foamed lightweight soil (FLS) with superior performance was prepared to be used as a subgrade filling material in an intelligent networked vehicle test site. The production process of practical engineering FLS is simulated in the laboratory. The performance of the prepared FLS is the same as that of practical engineering. The test results show that the FLS prepared with 30% cement, 30% granulated blast furnace slag, and 40% fly ash as cementing material has a flow factor of 175 mm. It has good fluidity and is easy to pump. Wet density reaches 593 kg/m3 within the range of the control index of 600 ± 30 kg/m3. The compressive strength of 7 d and 28 d reaches 0.82 MPa and 1.90 MPa, respectively, which is higher than the design strength of 0.5 MPa and 1.0 MPa. Compared with FLS made of pure cement as a cementing material, the FLS has a low heat of hydration, good volume stability, no cracks on the surface, excellent sulfate resistance, good economy, and low carbon characteristics. In the meantime, it can reduce 70% CO2 emissions in cement production. The advanced vehicle-mounted mobile intelligent control system is flexible and convenient in actual engineering construction. It can display the wet density of FLS online, which is easy to adjust and control to ensure the quality stability of FLS.

Study on the Effect of Foam Stability on the Properties of Foamed Lightweight Soils

“…With its lightweight, good fluidity, ease of construction, high strength after hardening, and good integrity, FLS has been widely used in housing projects, railway and highway road foundations, military, civil engineering, airport runway end buffer paving, and other fields [ 6 , 7 , 8 ]. A large-scale test site for intelligent cars in Wuhan, China, has been successfully constructed using 860,000 m 3 of FLS instead of ordinary fill as fill material for the road base on soft ground such as lakes and fishing ponds [ 9 ]. However, the disadvantages of FLS are also obvious: low compressive strength and poor stability.…”

Preparation and Properties of Low-Carbon Foamed Lightweight Soil with High Resistance to Sulphate Erosion Environments

“…The replacement of ordinary fill with FLS in construction has been extensively studied. In a previous study on the application of FLS in the road base during highway widening, FLS exhibited a higher compressive strength, better water resistance and less settlement compared with ordinary fill [ 13 , 14 , 15 ]. Another study on the use of FLS during road widening showed that the settlement of the test section filled with FLS was much less than the allowable settlement value, indicating that FLS is a highly suitable road fill material in road expansion projects [ 16 ].…”