Surface area development of Portland cement paste during hydration: Direct comparison with 1H NMR relaxometry and water vapor/nitrogen sorption

Kurihara, Ryo; Maruyama, Ippei

doi:10.1016/j.cemconres.2022.106805

Cited by 41 publications

(6 citation statements)

References 145 publications

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“…Though further evidence is lacked, the former reason seems more rea- implying the C-S-H sheets could be more closely connected. This kind of situation can be also observed when water is less sufficient such as lower water to cement ratio or the relative humidity (RH) is lower 18,19) .…”

Section: The Influence Of Mixing Condition On Pore Structurementioning

confidence: 98%

Effect of Mixing Procedures on Cement Reaction and Resultant Strength Development

YANG,

CHENG,

KURIHARA

et al. 2024

Cement Science and Concrete Technology

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：The hydration of cement is highly related with the mixing condition. The influence of mixing order to firstly add water or cement and mixing mass on the properties cement paste was investigated. XRD and Rietveld quantification was applied to study the hydration process and NMR is utilized to study the pore structure evolution. The results suggest the change in mixing condition does not intensively affect the hydration degree but affect the pore structure. Changing mixing procedures especially the mixing order exert a long-lasting influence the water distribution in interhydrate and gel pores.

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Section: The Influence Of Mixing Condition On Pore Structurementioning

confidence: 98%

Effect of Mixing Procedures on Cement Reaction and Resultant Strength Development

YANG,

CHENG,

KURIHARA

et al. 2024

Cement Science and Concrete Technology

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“…MKG pastes cured for 6 hours, 1 day, and 7 days were put into the test chamber for in-situ testing, and the transverse relaxation time (T2) distribution spectrum was further obtained. LF-NMR can detect T2 based on 1 H intrinsic relaxation behaviour of water in the specimens, which reveal the exchange process of water protons due to diffusional interchange of water protons between free water and bound water molecular [49]. The signal scanning adopted CPMG sequence, and the main frequency and number of sampling points were set as 23 MHz and 540018, respectively.…”

Section: Low Field 1 H Nuclear Magnetic Resonancementioning

confidence: 99%

“…5, the internal moisture distribution can be investigated using T2 signals obtained through LF-NMR to analyse the capillary stress characteristics of MKG paste [66]. Moisture in cementitious materials is considered to be bound in pores in the form of inter-gel water, capillary water and free water [49,67]. According to the relevant studies [68][69], T2 peaks represent the moisture bound to the matrix in different binding states and the signal amplitude describes the pore fluid content.…”

Section: Internal Moisture Distributionmentioning

confidence: 99%

Early-age deformation of hydrophobized metakaolin-based geopolymers

Ruan

Chen

Liu

et al. 2023

Cement and Concrete Research

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“…The Hardened cement paste is the most important component of concrete, which is a porous material with pore sizes varying from several micrometers to nanometers. The performance of concrete is derived from the precipitation of calcium silicate hydrate (C-S-H) [ 6 ]. A detailed understanding of the C-S-H structure in the cement paste and the mechanisms determining the concrete properties can directly contribute to the increase in the durability of concrete materials and the reduction in the CO 2 emissions for combating climate change by recycling.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites as Substituent of Cement: Structure and Mechanical Properties

et al. 2023

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To date, the scientific research in the field of recycling of construction and demolition wastes was focused on the production of concrete, cements, and bricks. The attainment of these products was limited to the addition of suitable binder contents, such as lime or cement, compaction, and possibly heat treatment, without a concrete recycling method. In this paper, new cement materials consisting of 2.5 weight% composite and originating from construction and demolition waste powder, were prepared and investigated in view of applications in the construction industry as a substituent of cement. The materials with recycled powder from construction and demolition wastes were characterized by X-ray diffraction (XRD), infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The XRD data indicate vitroceramic structures with varied crystalline phases. The NMR relaxometry data show four reservoirs of water associated with bounded water and with three types of pores in the composite construction material. The micro-Vickers hardness was measured to reflect the influence of composite nature in the local mechanical properties of the composite-cement for the mixture with Portland cement and (EC) expired cement.

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Surface area development of Portland cement paste during hydration: Direct comparison with 1H NMR relaxometry and water vapor/nitrogen sorption

Cited by 41 publications

References 145 publications

Effect of Mixing Procedures on Cement Reaction and Resultant Strength Development

Effect of Mixing Procedures on Cement Reaction and Resultant Strength Development

Early-age deformation of hydrophobized metakaolin-based geopolymers

Nanocomposites as Substituent of Cement: Structure and Mechanical Properties

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