Abstract
Gravel and cement can effectively improve the low strength of traditional Earth materials. There have been few studies on test methods for raw soil‐based composite admixtures. By introducing the theory of single lattice formula testing, the compressive strength of 10 formulas and 60 modified raw soil cubic specimens were tested. The failure process, failure mode, and compressive strength of specimens were studied. The effects of different formulations of raw soil on strength, peak displacement, and dispersion were analyzed. The results showed that cement content had a significant effect on the compressive strength and dispersion of earth material specimens. The optimal modification formula of cement, gravel, and raw soil was determined to be 0.1/0.08/0.82 (mass ratio). At the same time, the applicability of the test method was verified, which can be used as a reference for the experimental study on modification formulations of earth materials.
Highlights
Earth materials are some of the oldest local building materials and are widely used in dwelling construction all over the world
In the design of the test, the test level is a factor of each factor accounted for in the proportion of the total, with the percentage of all P factors in the experiment being the percentage of the total. e total composition must be equal to 1 (100%). is kind of design is called formula design, known as mix design [20]
Compared with NS3, NS5, and NS2 group, when the cement content is 3% and the gravel content is 5%, 13.5%, and 22%, the compressive strength of the specimen is 5.77 MPa, 4.39 MPa, and 3.75 MPa. e results show that when the cement content is fixed, the strength of the specimen decreases with the increase of the gravel content
Summary
Earth materials are some of the oldest local building materials and are widely used in dwelling construction all over the world. Stephane Hans of the University of Lyon and others have proposed the modification of raw soil materials with cement and lime and calculated the damage of existing native. Milani and Labaki studied the sustainability of the original soil materials and evaluated the modified soil materials mixed with cement and lime. Using physical modification methods according to research results from this research group, a modified formula test was carried out with gravel (gravel, 10–20 mm diameter), cement, and raw soil [17]. Sixty specimens were produced for compressive strength testing and the strength, peak displacement, discrete reference parameters, parameter analysis, and elimination element regression were used to draw a triangular contour map From these results, a reasonable modification test method and formula were presented. A reasonable modification test method and formula were presented. e research provided suggestions for similar studies in the future
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