Effects of Wood Ash on Properties of Concrete and Flowable Fill

Abstract

This research investigated the use of wood ash to partially replace cement or sand in conventional concrete, roller compacted concrete (RCC), and flowable fill. The main focus was to determine how the wood ash addition affected the main fresh and hardened properties of these materials. It was found that the wood ash could be successfully incorporated into the conventional concrete. In particular, the wood ash addition not only accelerated the setting, but also improved the early and the 28-day compressive strength of concrete that contained the blast furnace slag. It was also observed that the wood ash could be positively added into RCC to facilitate the compaction and reduce the risk of segregation. In addition, the wood ash can be beneficially introduced into the flowable fill mixtures to facilitate flow, to alleviate bleeding and subsidence, as well as to achieve controlled strength especially when combined with the class C or the class F fly ash.

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

“…These materials are characteristic of CDW residues and, according to some authors, can influence concrete properties. The amount of wood can increase WA and decrease CS [40]. The addition of Styrofoam to the concrete can reduce its density, and consequently decrease CS as well as improve its thermal conductivity [41,42].…”

Fire Suppression and Thermal Behavior of Biobased Rigid Polyurethane Foam Filled with Biomass Incineration Waste Ash

“…An overview of recent studies [3] showed that WA is acceptable as an alternative replacement to cements and concrete aggregates due to its high silica content [4,5]. It was shown that WA could be used as a pozzolan up to 20 wt.% [6,7] and as an additive up to 10 wt.% [8] to obtain concrete material with optimal characteristics as well as to reduce price and CO 2 emissions [9]. However, it is determined [10] that such WA has averagely only 6.30 wt.% of spherical particles; therefore, its usage as a pozzolanic additive in concretes is limited.…”

Performance of wood ash blended reinforced concrete beams under acid (HCl), base (NaOH) and salt (NaCl) curing conditions

“…The disposal costs of the ash are rising and volume of ash is increasing, a sustainable ash management which integrates the ash within the natural cycles needs to be employed [4][5][6].The utilization of pozzolanic materials like fly ash, GGBS, metakaolin and rice husk ash in cement and concrete manufacturing was implemented for several decades [7][8][9][10][11]. Wood ash is pozzolanic material, it can blend in concrete partially by cement [12][13]. Recent studies on the use of wood ash as a new brick material supplement appear to be a viable solution not only to the environmental problem but also to the problem of to economic design of buildings [14][15][16][17].…”