The Effect of Circulating Fluidised Bed Bottom Ash Content on the Mechanical Properties and Drying Shrinkage of Cement-Stabilised Soil

Abstract

This study aimed to determine the effect of circulating fluidised bed bottom ash (CFB-BA) content on the mechanical properties and drying shrinkage of cement-stabilised soil. Experiments were performed to study the changes in unconfined compressive strength and expansibility of cement-stabilised soil with different CFB-BA contents and the underlying mechanisms based on microscopic properties. The results show that CFB-BA can effectively increase the unconfined compressive strength of the specimen and reduce the amount of cement in the soil. When the combined content of CFB-BA and cement in the soil was 30%, the unconfined compressive strength of the specimen with C/CFB = 2 after 60 days of curing was 10.138 MPa, which is 1.4 times that of the pure cement specimen. However, the CFB-BA does not significantly improve the strength of the soil and cannot be added alone as a cementing material to the soil. Additionally, swelling tests showed that the addition of CFB-BA to cement-stabilised soil can significantly reduce the drying shrinkage. This research project provides reference values for the application of CFB-BA in cement–soil mixing piles, including compressive strength and the reduction in the shrinkage deformation of specimens.

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

“…This also shows that the post-failure stress of stabilized soil drops much more rapidly with a longer curing period than with a shorter curing period [51]. As shown in Figure 5, there are significant increases in the UCS of all stabilized samples with an increasing curing period, and this has been reported by many researchers [52][53][54][55]. The results show that the strength increased from 257 kPa for untreated soil to 2270 kPa and 2881 kPa for soil with 15% OPC at seven and 28 days, respectively.…”

Chitosan‐Based Hydrogels for Infected Wound Treatment

“…Dodecenyl succinylated phthaloyl chitosan B. subtilis, S. aureus, E. coli [ 103] N, N, N-trimethyl chitosan-polylactide S. aureus [104] Chitosan-sulfonamide derivatives S. aureus, E. coli [ 105] N-succinyl chitosan E. coli and S. aureus [ 106] Carboxymethylated chitosan E. coli [ 107] Aldehyde chitosan E. coli [ 108] N-Aminorhodanine modified chitosan/copper ions Staph. strain [ 109] Carboxymethyl chitosan/ZnO nanocomposite S. aureus, E. coli [ 110] Hydroxypropyltrimethylammonium chloride CS…”

The Effect of Bottom Ash Ball-Milling Time on Properties of Controlled Low-Strength Material Using Multi-Component Coal-Based Solid Wastes

“…The BA is mainly irregular with smooth edges and corners, mainly composed of SiO 2 , A1 2 O 3 , CaO, and Fe 2 O 3 , accounting for about 90%, and belongs to silicon-alumina materials [22]. BA has good pozzolanic activity and can be used as a concrete admixture after being optimized by fine grinding or chemical modification [23,24]. For example, Pakawat et al studied the variation of notch size particles on BA pozzolanic activity, and the results showed that the compressive strength values of mortar prepared with BA were 5% and 14% higher than that of mortar using 100% Portland cement at 28 d and 60 d of curing ages, respectively.…”