Basic rheological and mechanical properties of high-volume fly ash grouts

Remediation of Abandoned Mines Using Coal Combustion By-Products

“…The mixture designs for the laboratory tests are listed in Table 3.2. The amount of each by-product in a specimen was selected considering the widely used percentages in grout mixture design (Gabr et al 1996, Huang 2001, Mirza et al 2002, United Kingdom Quality Ash Association 2002. Eight of the specimens were prepared using spring water and the other eight were prepared with mine water to more closely represent the field conditions.…”

CCB-based encapsulation of pyrite for remediation of acid mine drainage

“…Relatively high FA-BA content mixtures (F3, L3, F4, L4) have relatively low 7-day strengths; however, they gain strength after 14 days of curing. Fly ashes generally have a slow reactive nature but they gain substantial strength upon sufficient curing [23]. It is observed that the rate of strength gain is relatively low after 14 days for FBC-based specimens, compared to their 7-day strengths.…”

Effect of sand, fly ash, and coarse aggregate gradation on preplaced aggregate concrete studied through factorial design

“…Fly ash has been known to retard lean grout mixtures as well as self-compacting mortars [7,28], which is due to the delayed reaction of fly ash particles that only start to harden after cement hydration and calcium hydroxide is produced [7]. This can be observed on mix 1, 10, and 3 in Table 5.…”

“…Low water-to-binder (W/B) grouts are studied to ensure fresh grout stability, coarse aggregate interface bond and to maximize strength. Fly ash as a pozzolanic admixture is used to improve the fresh mechanical properties of low W/B grouts since it is known that fly ash improves fresh properties of mixtures [7], its use on injectable grouts are therefore advantageous, especially on low W/B grouts. Furthermore, Fly ash is abundant, cheap and commonly used for concrete making in the region.…”