Effect of Different Fineness of Cement on the Autogenous Shrinkage of Mass Concrete under Variable Temperature Conditions

Gong, Jiale; Mao, Zhongyang; Cao, Zhe; Huang, Xiaojun; Deng, Min

doi:10.3390/ma16062367

Cited by 4 publications

(1 citation statement)

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“…The pore structure is a very important parameter that influences the above properties and should, therefore, be correctly assessed. Recent studies have made it evident that the permeability and strength of cement pastes are governed by pore size distribution rather than porosity [ 23 ]. The smaller the pore size, the higher the compressive strength and the lower the thermal conductivity [ 24 ].…”

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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Section: Introductionmentioning

confidence: 99%

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

et al. 2023

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Experimental study of the effect of senilia senilis as a partial replacement for cement in concrete production: towards sustainable construction materials

Bamigboye,

Obozokhae,

Olaoye

et al. 2024

Discov Mater

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The world today, is plagued by several environmental problems including air pollution and global warming. These aforementioned environmental problems are prominently associated with the consumption of natural resources in manners that have proven to be unsustainable. The construction industry has been seen to play a major role in contributing to the natural resources consumption and environmental problems, at large. Cement production brings about the emission of toxic gases that pollute the atmosphere, thereby promoting these environmental problems. Consequently, concrete technology findings have been directed toward realizing alternative sustainable materials for utilization in the construction industry. Seashell waste has proven promising in the partial replacement of cement in concrete. This study had carried out experimental investigations on senilia senilis shell as a partial cement replacement material in concrete production. The senilia senilis shell was crushed into senilia senilis powder (SSP), processed, and utilized to partially replace cement at 10%, 20%, 30%, 40%, 50%, and 60% in concrete. Fineness, Initial and final setting, and specific gravity tests were carried out on seashell powder to ascertain its suitability for cement replacement. Physical and mechanical tests were carried out on the concrete samples produced. The mechanical properties of the various concrete specimens were also analyzed in this study. Also, the elemental composition and morphological analysis of the SSP and the various concrete specimens were examined in this study with the use of a Scanning Electron Microscope (SEM) and energy-dispersive X-ray (EDX). The results of this study indicate that SSP concrete at 10% to 20% replacement of cement, can be utilized for various mix ratios in the construction industry.

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