Performance and evaluation of alum sludge ash as a brick material

This paper investigates the effect of normal curing (NC), air curing (AC), and burlap curing (BC) under different curing periods on the mechanical strength and durability of kenaf fibre reinforced blended cementitious composites (KFRBCC) with thermally activated alum sludge ash (AASA). The aim is to determine the most efficient condition and period for curing KFRBCC and to assess the effect of accelerated ageing on strength and durability of KFRBCC after wet/dry cycles. Meanwhile, the microstructure of these mixes is observed via scanning electron microscopy (SEM). The KFRBCC is designed to achieve strength beyond 50 MPa after 28 days (d) of curing by adding 2% treated kenaf fibre (KF) and by replacing Ordinary Portland Cement (OPC) with AASA. The findings suggest that compressive strength and durability of KFRBCC with 40% AASA cured under BC after age of 28 d are enhanced. The addition of treated KF with AASA have helped in limiting the reduction in the compressive strength and durability of the KFRBCC, particularly under prolonged curing period.

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Cementitious composites containing alum sludge ash: An investigation of microstructural features by an advanced nanoindentation technology

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124286 ◽

2021 ◽

Vol 299 ◽

pp. 124286

Author(s):

Yue Liu ◽

Yan Zhuge ◽

Christopher W.K. Chow ◽

Alexandra Keegan ◽

Jun Ma ◽

...

Keyword(s):

Cementitious Composites ◽

Alum Sludge ◽

Sludge Ash

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Influence of Thermally Activated Alum Sludge Ash on the near Surface Characteristics of Multiple-Blended Binders Concretes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.754-755.421 ◽

2015 ◽

Vol 754-755 ◽

pp. 421-426 ◽

Cited By ~ 1

Author(s):

Haider Mohammed Owaid ◽

Roszilah Hamid ◽

Mohd Raihan Taha

Keyword(s):

Inner Core ◽

Surface Characteristics ◽

Initial Surface ◽

Surface Absorption ◽

Palm Oil Fuel Ash ◽

Near Surface ◽

Cement Replacement ◽

Thermally Activated ◽

Alum Sludge ◽

Sludge Ash

This research presents the results of an investigation on the influence of thermally activated alum sludge ash (AASA) as a partial cement replacement on the near-surface characteristics of binary and ternary blended binder (TBB) concretes incorporating silica fume (SF), ground granulated blast furnace slag (GGBS), and palm oil fuel ash (POFA). All of the mixtures were prepared with a water/binder ratio and total binder content of 0.30 and 493 kg/m3, respectively. Initial surface absorption (ISAT) and sorptivity tests were conducted at the age of 28 days. Results indicate decrease in the ISAT and sorptivity values of binary blended binders with 15% AASA cement replacement compared with the control and 20% AASA concretes. A higher replacement level of 20% AASA did not help improve inner core durability but improved surface durability characteristics. All TBB concretes performed better than the binary blends with AASA at the same replacement levels.

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