Eco-friendly self-compacting cement pastes incorporating wood waste as cement replacement: A feasibility study

Usman, Muhammad; Khan, Asfand Yar; Farooq, Hassan; Hanif, Asad; Tang, Shengwen; Khushnood, Rao Arsalan; Rizwan, Syed

doi:10.1016/j.jclepro.2018.04.186

Cited by 82 publications

(26 citation statements)

References 32 publications

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“…Similarly, the inclusion of a blend of recycled aggregates further increased the slump. The rheological properties (flowability/workability) of fresh RAC and NAC was similar to the previous findings [22,25,47] by the same authors. The rounded aggregates may upsurge/increase the workability of fresh concrete due to a “ball-bearing” effect [48].…”

Section: Results Discussion and Analysessupporting

confidence: 90%

Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

et al. 2018

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This paper investigates the properties of steam cured recycled aggregate concrete (RAC), in an attempt to determine the optimum conditions of the steam-curing cycle for RAC, and incorporating high early strength cement (HESC). Varying conditions of steam curing were employed. The steam-curing cycle was set based on the peak temperature, and the duration for which the peak temperature was maintained. Three peak temperatures were used for steam curing, 50 °C, 60 °C, and 70 °C, maintained for up to two hours. The compressive strength results indicated that the steam-curing cycle employing the peak temperature of 50 °C maintained for one hour with a total duration of four hours was the optimum for strength development, both at the early and late stages of hydration. Determining the optimum steam-curing temperature and duration will help reduce the associated curing cost, thus further economizing the production cost of recycled aggregate concrete.

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Section: Results Discussion and Analysessupporting

confidence: 90%

Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

et al. 2018

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“…Also, recycled aggregates further increased the slump. The findings are similar to previously published results [16,17,55] by the same authors. The rounded aggregates may upsurge/ increase the workability of fresh concrete due to a "ballbearing" effect [56].…”

Section: Fresh State Concrete Propertiessupporting

confidence: 93%

Steam-cured recycled aggregate concrete incorporating moderately high early strength cement: effect of binder content and curing conditions

2019

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Steam curing employed for faster strength gain due to higher hydration rate may lead to shrinkage issues, and hence the use of moderately high early strength cement (MESC) is proposed instead of typically used high early strength cement (HESC) which has a high C3S content. This paper evaluates the suitability of MESC for use in precast concrete. The objective was to (i) determine the feasibility of MESC in recycled aggregate concrete (RAC), (ii) determine the optimum steam curing conditions (curing duration, maximum temperature, and duration of holding maximum temperature), and (iii) evaluating the beneficial use of reduced binder content to compensate for steam curing. Four series of RAC were developed which were subjected to nine different steam curing condition, and the resulting strength properties were determined. Though all the developed concrete specimens achieved the design strength of 30 MPa, those cured at 50 °C with 1 h duration of exposure to maximum temperature exhibited the best performance. Further, it was found that even though reducing the binder content reduces the ultimate strength at 28-day age, curing at 70 °C with 2 h exposure to maximum temperature duration (for 7% reduction in binder volume) leads to merely 11.8% strength decline. It is concluded that MESC can be effectively used in steam cured RAC instead of OPC and HESC with meagre strength loss when cured at maximum temperature of 50 °C maintained for 1 h while the total curing time being 4.5 h. Thus, utilizing MESC in RAC shall not only help combat the persistently declining natural resources but also reduced the associated carbon dioxide emissions, thereby promoting sustainable development.

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“…However, this reduction might be linked with the reduced admixture content of WA incorporated mixes. In addition, the slump values also showed that WA has porous characterictics and required more water content to compensate slump loss which is line with previous researches (Udeoyo, 2006;Ban Cheah, 2018& Usman, 2018) that WA mixes require higher water content for the same workability requirements.…”

Section: Slump Testsupporting

confidence: 89%

Utilisation of wood ash for environmentally friendly concrete production

Bostancı¹

2019

Sustainable Construction Materials and Technologies (SCMT)

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Portland cement (OPC) production is responsible approximately 5% to global CO2 emissions which is one the greenhouse gases that contributes global warming the most. The aim of cement stakeholders is to use waste products as an alternative to OPC in order to improve sustainability credentials of concrete production. Against this background, wood ash (WA) use as a replacement to OPC was considered to be an alternative approach for environmentally concrete production. Reported work carried out to evaluate the use of WA use as a partial replacement to OPC. In the light of these, OPC was replaced by WA with replacement levels of 5% and 12.5% for the production of C35 concrete strength class. Results showed that WA incorporation resulted in lower performances as WA replacement level increased. However, 5% WA incorporated concrete mix achieved similar results compared to control mix. The results also indicate promising performances for longer ages.

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Eco-friendly self-compacting cement pastes incorporating wood waste as cement replacement: A feasibility study

Cited by 82 publications

References 32 publications

Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

Steam-cured recycled aggregate concrete incorporating moderately high early strength cement: effect of binder content and curing conditions

Utilisation of wood ash for environmentally friendly concrete production

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