A method to increase the workability retention of concrete with limestone calcined clay based cementitious system using a dispersing agent containing sodium hexametaphosphate

Bhattacherjee, Shantanu; Jain, Smrati; Santhanam, Manu

doi:10.1016/j.cemconcomp.2022.104624

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…Recently, there has been a significant increase in research [263][264][265][266][267][268][269][270][271] focused on the potential utilization of CC as an SCM in the manufacturing of cement, with a particular emphasis on advancing its economic viability [272].…”

Section: Consideration Of CC As Scm: Replacement Of Portland Cement B...mentioning

confidence: 99%

A Review: Construction and Demolition Waste as a Novel Source for CO2 Reduction in Portland Cement Production for Concrete

Kaptan,

Cunha,

Aguiar

2024

Sustainability

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There is an increasing global recognition of the need for environmental sustainability in mitigating the adverse impacts of cement production. Despite the implementation of various carbon dioxide (CO2) mitigation strategies in the cement industry, such as waste heat recovery, the use of alternative raw materials and alternative fuels, energy efficiency improvements, and carbon capture and storage, overall emissions have still increased due to the higher production levels. The resolution of this matter can be efficiently achieved by the substitution of traditional materials with an alternative material, such as calcined clay (CC), construction and demolition waste (CDW), which have a significant impact on various areas of sustainable development, including environmental, economic, and social considerations. The primary objectives of employing CDW in the Portland cement production are twofold: firstly, to mitigate the release of CO2 into the atmosphere, as it is a significant contributor to environmental pollution and climate change; and secondly, to optimize the utilization of waste materials, thereby addressing the challenges associated with their disposal. The purpose of this work is to present a thorough examination of the existing body of literature pertaining to the partial replacement of traditional raw materials by CDW and the partial replacement of Portland cement by CDW and to analyze the resulting impact on CO2 emissions.

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Section: Consideration Of CC As Scm: Replacement Of Portland Cement B...mentioning

confidence: 99%

A Review: Construction and Demolition Waste as a Novel Source for CO2 Reduction in Portland Cement Production for Concrete

Kaptan,

Cunha,

Aguiar

2024

Sustainability

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“…SHMP is a commonly used admixture in cementitious materials. SHMP acts as a retarder (Zhang et al, 2019), dispersant (Jia et al, 2016) and other agents in concrete (Bhattacherjee et al, 2022), and it is a chelating agent that forms chelates with cations in concrete. The chelating ions in EDTA-2Na were chosen as the influencing factor for the internal transport of SHMP in concrete.…”

Section: Experiments On the Transport Of Ionic Chelators Inside Concretementioning

confidence: 99%

Transport properties of moisture and ionic chelators in concrete

Guan

2023

Front. Mater.

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The transport properties of moisture and ionic chelators in the concrete affect not only the durability of the concrete, but also the effectiveness of the repair material in repairing cracks in the concrete. The transport of water and ionic chelators in the concrete was investigated by capillary absorption tests and ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer). It was found that the smaller the radius of the capillary pore within the concrete, the longer it takes to saturate it with water.The different pore sizes of capillaries take different times to reach saturation, which is one of the reasons for the “square root shift phenomenon” of capillary water absorption in concrete. The higher the initial concentration, the easier it is for the ion chelators to be transported inside the concrete within a certain transport depth range. However, after a certain range of transport depth, the initial concentration does not have a significant effect on the transport of the ion chelators. This is not the same as the transport pattern of nonchelated ions. Comparing the transport processes of chelated and non-chelated ions within the concrete, it was found that chelated ions form aggregation zones when transported within the concrete. The analysis suggests that the repair of pores and cracks within the concrete by the chelating agent promotes the creation of aggregation zones. Other factors such as the presence of chelated ions, the transport medium, changes in porosity, and wet and dry cycles can all influence the formation of chelated ion aggregates.

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“…The addition of chemical admixture is an effective method to improve the performance of Portland cement (PC)-based concrete. Polycarboxylate superplasticizer (PCE) has been widely used due to its excellent performance in reducing water consumption of concrete and improving the workability and fluidity of concrete [ 1 , 2 ]. Generally, the PCE is a type of comb shape or brush-like structured water-soluble polymer, composed of a backbone with different anchored groups for adsorbing on particle surface and the polyethylene glycols (PEO) based side chains, including α-allyl-ω-hydroxy poly (ethylene glycol) ether (APEG), 2-methyl allyl polyoxyethylene ether (HPEG), isoprenyl oxy polyethylene glycol ether (IPEG), and methoxy polyethylene glycol methacrylate (MPEG), etc., which can physically hinder the agglomeration from cement particles [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Polycarboxylate Superplasticiser and Protein Retarders in Cementitious Materials Containing Na- Montmorillonite: Effect of Addition Methods

Tian

Ren

et al. 2022

Materials

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Polycarboxylate superplasticiser (PCE) is notably sensitive towards Na-Montmorillonite (Na-Mmt), an impurity generated from the manufacturing of concrete aggregate due to the chemical intercalation and poor surface adsorption. In order to improve the poor compatibility of PCE, the protein-based retarders were applied as the sacrificial agents, and its synergetic effects in cementitious materials containing Na-Mmt were investigated. The protein-based retarders were applied as the sacrificial agents and its synergetic effects in cementitious materials containing Na-Mmt were investigated. In addition to test rheology, minislump, and setting time, the adsorption behaviour and intercalation were characterised via Total Organic Carbon, X-ray photoelectron spectroscopy, and X-ray diffraction. The results revealed that the incorporation of protein-retarders improved the performance of PCE in terms of workability, and the rheological behaviour of cement with Na-Mmt. Moreover, compared to simultaneous addition, the application of separate addition further increased the workability and improved workability retention, with best dispersion performance obtained by prior adding the retarders, which could be due to the lessened intercalation between the layers of Na-Mmt.

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A method to increase the workability retention of concrete with limestone calcined clay based cementitious system using a dispersing agent containing sodium hexametaphosphate

Cited by 9 publications

References 45 publications

A Review: Construction and Demolition Waste as a Novel Source for CO2 Reduction in Portland Cement Production for Concrete

A Review: Construction and Demolition Waste as a Novel Source for CO2 Reduction in Portland Cement Production for Concrete

Transport properties of moisture and ionic chelators in concrete

Synergistic Effect of Polycarboxylate Superplasticiser and Protein Retarders in Cementitious Materials Containing Na- Montmorillonite: Effect of Addition Methods

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