Short-term effects of sulphate and chloride on the concrete containing coal bottom ash as supplementary cementitious material

Mangi, Sajjad Ali; Ibrahim, Mohd Haziman Wan; Jamaluddin, Norwati; Arshad, Mohd Fadzil; Jaya, Ramadhansyah Putra

doi:10.1016/j.jestch.2018.09.001

Cited by 64 publications

(51 citation statements)

References 38 publications

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“…It was generally perceived that consistency of paste increases with increase in cement replacement level with ground CBA. The consistency was found to be increased because ground CBA absorbed more water than the normal cement paste [24,25]. Since the replacement of cement with ground CBA reduces the amount of tricalciumsilicate (C 3 S) in paste thus resulting in longer setting time in the cement paste [26].…”

Section: Particle Fineness Effect On Setting Timementioning

confidence: 99%

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Mangi

Ibrahim

Jamaluddin

et al. 2019

J. Eng. Technol. Sci.

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The grinding process is necessary to convert original coal bottom ash (CBA) into a powder form. The aim of this study is to evaluate the grinding process effects on physical properties of CBA, it influences on consistency and setting time of cement paste and to predict it potentiality based on chemical characteristics to reduce the alkali-silica reaction (ASR) in concrete. The CBA is the by-product of coal based thermal power plant. Due to high production of electricity in Malaysia, the excess amount of CBA has been produced annually and it causes the environmental problems. Therefore, it is necessary to come up with advanced solutions for that pollution. This study considered the different grinding periods i.e. 2, 10, 20, and 40hrs as to produce different particle fineness. It was perceived through the laboratory findings that the more the grinding period, finer the particle sizes. Besides that, cement paste with 10, 20 and 30% of ground CBA as a substitute of ordinary portland cement (OPC) by weight was prepared, it was observed that the consistency of OPC paste increases with the addition of ground CBA. Moreover, initial and final setting time of cement paste containing ground CBA was observed higher than the OPC paste. Hence, based on experimental analysis and energy efficiency scenario, grinding period of 20hrs with specific surface area 3835.75 cm 2 /g is suggested for the future studies.

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Section: Particle Fineness Effect On Setting Timementioning

confidence: 99%

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Mangi

Ibrahim

Jamaluddin

et al. 2019

J. Eng. Technol. Sci.

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“…Accordingly, the material properties of CBA concrete have been examined in previous studies [20][21][22]. Mangi et al [23,24] investigated the effect of CBA on the concrete strength properties under sulfate and chloride environments. Balapour et al [25] performed an experimental program to investigate the potential use of CBA for the internal curing of concrete systems.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Yang

Park

2020

Materials

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The thermal conductivity of concrete is a key factor for efficient energy consumption in concrete buildings because thermal conductivity plays a significant role in heat transfer through concrete walls. This study investigated the effects of replacing fine aggregates with coal bottom ash (CBA) and the influence of curing age on the thermal properties of high-strength concrete with a compressive strength exceeding 60 MPa. The different CBA aggregate contents included 25%, 50%, 75%, and 100%, and different curing ages included 28 and 56 days. For concrete containing CBA fine aggregate, the thermal and mechanical properties, including the unit weight, thermal conductivity, compressive strength, and ultrasonic velocity, were measured. The experimental results reveal that the unit weight and thermal conductivity of the CBA concrete were highly dependent on the CBA content. The unit weight, thermal conductivity, and compressive strength of the concrete decreased as the CBA content increased. Relationships between the thermal conductivity and the unit weight, thermal conductivity and compressive strength of the CBA concrete were proposed in the form of exponential functions. The equations proposed in this study provided predictions that were in good agreement with the test results. In addition, the test results show that there was an approximately linear relationship between the thermal conductivity and ultrasonic velocity of the CBA concrete.

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“…Using soil, stabilized with bottom ash and strength as evaluation criteria, Gullu [11] employed factorial experimental approach to determine effective dosage rate of the stabilizer, and concluded that the approach and effective size estimation compared well in decision making. Mangi et al [12] also showed that admixture of coal bottom ash and cement can reduce the negative effect of sulphate and chloride on the performance of cement. The negative effect of sulphate on cement was also studied by Demir et al [13], and concluded that strength of specimens containing blend of cement with fly ash, bottom ash and blast furnace slag, cured in sodium sulphate solution for 360 days, increased by 2.0% compared to the controlled specimens.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

et al. 2020

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A clay soil, classified as Clay of High plasticity (CH) according to Unified Soil Classification System (USCS) was stabilized with cement, Rice Husk Ash (RHA) and promoter. The mineralogy of the clay soil and the morphology of the clay and clay specimens admixed with varied composition of cement, RHA and promoter were evaluated in order to determine effect of the RHA on promoter stabilization of cement based clay soil. The promoter used in this study consists of calcium chloride and sodium hydroxide in the ratio of 1:1. The clay was remolded at standard Proctor compaction energy and the specimens were mixed with 0, 1.0, 2.0 and 3.0% cement, admixed with 1.0, 2.0, 3.0% RHA each, and 0.3, 0.6, 1.0% promoter each. The molded specimens were cured for 1, 7, 14, 28, 60 and 90days before testing for Unconfined Compressive Strength (UCS) and consequently the modulus of elasticity. The UCS of specimens without cement increased from 20 kN/m2 for the natural clay soil to 95 kN/m2 on addition of 3% RHA and 1.0% promoter after 28 days of curing, representing 475% increase in the UCS. This increase was confirmed by morphology of the clay soil mixed with RHA and promoter only, which showed presence of calcium silicate hydrate. Addition of 3.0% cement with 3 and 1.0% RHA and promoter respectively, increased the UCS from 220 to 375kN/m2 after 28 days of curing, which was also confirmed by the morphology of the specimens. The highest elastic modulus of 48.3 MPa was observed at specimens containing 3% cement, 3% RHA and 1.0% promoter.

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Short-term effects of sulphate and chloride on the concrete containing coal bottom ash as supplementary cementitious material

Cited by 64 publications

References 38 publications

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

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