Abstract
This study investigated the unconfined compressive strength change law of cement modified slurries (CMS) under different curing ages. We conducted unconfined compressive strength tests using slurry and cement as raw materials. The cement contents were 5%, 10%, 15%, 20%, and 25%. The curing ages were 7, 14, 28, 56, 90, 120, 150, and 180 d. A time effect model of CMS strength was established based on the measured UCS strength-curing age and the strength-cement content curves. The test results proved that the UCS of the CMS increased significantly with an increase in the curing age, and after 90 days, the UCS gradually increased to a fixed value. The time effect model better characterized the relationship between the UCS of the CMS and the curing age and the cement content, as the predicted value had a high correlation with the measured value. We conducted scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD) tests to analyze the microstructure and chemical composition of the CMS. The microscopic test results demonstrated that the increase of cement content and curing age increased the amount of gelling substances in the CMS and made the overall structure more compact, thereby increasing its macro strength.
Highlights
Slurry is a type of turbid suspension system composed of water, bentonite particles, clay particles, and admixtures
Using cement is feasible for modifications of slurries. rough studying the changes of the mechanical properties of cement modified slurries (CMS) over extended curing ages, relevant mathematical models were established to effectively predict the key indexes. rough the microtests of CMS, the strength variation mechanism can be explained from the micromechanism aspect, which can provide a reference for the engineering applications of modified slurries
unconfined compressive strength (UCS) Test Results. e stress-strain data curves of CMS measured by UCS tests with different cement contents and different curing ages are shown in Figure 6, where 6(a)–6(h) represent the stress-strain curves with different cement contents at curing ages of 7 d, 14 d, 28 d, 56 d, 90 d, 120 d, 150 d, and 180 d, respectively
Summary
Slurry is a type of turbid suspension system composed of water, bentonite particles, clay particles, and admixtures. E unconfined compressive strength (UCS) increased with increasing curing age and cement content, while the failure strain decreased. Cement can improve the engineering properties of soft soil, and the UCS of cement soil increases with the increase in curing age. As slurries and soft soils have similar engineering characteristics, it is feasible to establish a time effect model of cement modified slurries (CMS). E SEM analysis of cement stabilized soil conducted by Mousavi [26] demonstrated that cement could improve the strength of soil due to the hydration reaction. E above studies demonstrated that the mechanical properties of slurry can be effectively improved by adding modified materials. Rough studying the changes of the mechanical properties of CMS over extended curing ages, relevant mathematical models were established to effectively predict the key indexes. Using cement is feasible for modifications of slurries. rough studying the changes of the mechanical properties of CMS over extended curing ages, relevant mathematical models were established to effectively predict the key indexes. rough the microtests of CMS, the strength variation mechanism can be explained from the micromechanism aspect, which can provide a reference for the engineering applications of modified slurries
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