Evolution of Microstructural Characteristics of Carbonated Cement Pastes Subjected to High Temperatures Evaluated by MIP and SEM

Li, Yongqiang; Luo, Yaoming; Du, Hangyu; Liu, Wei; Tang, Luping; Xing, Feng

doi:10.3390/ma15176037

Cited by 4 publications

(2 citation statements)

References 41 publications

(53 reference statements)

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“…Exposed to temperatures surpassing 600ºC, a crack manifested on the surface. Subsequent temperature increments to 720ºC and 950ºC resulted in the generation of additional cracks, leads to significant weakening and brittleness of the concrete, resulting in a loss of its structural integrity (Li et al, 2022;Sulistyawati, 2005).…”

Section: P R E S Smentioning

confidence: 99%

Spent Bleaching Earth as Value-Added Material to Material Construction Applications: A Review

HASIBUAN

2023

JOPR

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Crude palm oil (CPO) serves as a significant export commodity for Indonesia, contributing positively to the country's economic growth and generating income for communities. Nonetheless, the production of CPO results in an environmental drawback in the form of refined, bleached and deodorised (RBD) palm oil, which poses environmental concerns. One pivotal material used in the purification process to transform the reddish-orange CPO into a lighter yellow hue is known as bleaching earth. As a consequence, a substantial amount of waste, referred to as spent bleaching earth (SBE), is generated and recovered to prevent harm to the environment. Remarkably, research has revealed that SBE exhibits pozzolanic properties, rendering it suitable for incorporation into construction materials. The primary objective of this study is to emphasize the advantages of integrating SBE into the construction material manufacturing process. Mixtures containing eco-process pozzolan (EPP), the product derived from SBE, have exhibited superior strength characteristics when compared to mixtures using ordinary portland cement (OPC). Furthermore, concrete incorporating pozzolan mixtures has displayed increased strength values when subjected to high temperatures, outperforming concrete made exclusively with OPC. However, further investigation is required to ascertain the thermal resistance capabilities of EPP as a component in mortar or concrete.

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Section: P R E S Smentioning

confidence: 99%

Spent Bleaching Earth as Value-Added Material to Material Construction Applications: A Review

HASIBUAN

2023

JOPR

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“…At lower values of pressure, the mercury fills the larger pores but is unable to fill the smaller ones. Increasing the pressure results in mercury filling the smaller pores, both inter- and intra-particle pores [ 25 , 26 , 27 ]. There are, however, some limitations to using MIP to assess the pore structure of various media, such as cement pastes, mortar, and concrete.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

et al. 2023

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The continuous development of urban areas around the world led to an increase in construction material use and demand, with concrete seeing significant market uptake. Although significant progress has been made to reduce the environmental impact of concrete, there is still a stringent need for improvement. One of the most widely used methods to reduce the environmental impact of the cement industry and the construction industry alike is the replacement of ordinary Portland cement (OPC) by supplementary cementitious materials (SCM). Aside from by-products of industry, SCMs could also come from natural sources. Taking into account the porous structure of zeolites and their contribution to the improvement of the mechanical and durability properties of cement-based materials, the analysis of pore structure in cement pastes incorporating micronized natural zeolite is deemed necessary. In this research, the OPC was replaced by zeolite in three different percentages: 10%, 20%, and 30% by mass. The evolution of pore structure was investigated by means of nuclear magnetic resonance relaxometry at the curing ages of 1, 7, and 28 days. The microstructure of cement pastes was assessed by scanning electron microscopy investigations at 1, 7, 14, 21, and 28 days. The obtained results show that smaller pore sizes are present in cement pastes containing zeolites during the first 7 days. However, at the age of 28 days, the reference mix exhibits a similar pore structure to the mix containing 10% micronized zeolite due to the presence of larger amounts of hydration products. Increasing the replacement percentage to 30% results in larger pores, as indicated by larger values of the relaxation time.

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Effect of accelerated carbonation curing on thermal evolution of hydrates in calcium sulfoaluminate cement

Kim,

Seo,

Park

et al. 2024

Construction and Building Materials

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Evolution of Microstructural Characteristics of Carbonated Cement Pastes Subjected to High Temperatures Evaluated by MIP and SEM

Cited by 4 publications

References 41 publications

Spent Bleaching Earth as Value-Added Material to Material Construction Applications: A Review

Spent Bleaching Earth as Value-Added Material to Material Construction Applications: A Review

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

Effect of accelerated carbonation curing on thermal evolution of hydrates in calcium sulfoaluminate cement

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