Influence of mineral composition of siliceous rock on its volume change

Igarashi, Go; Maruyama, Isao; Nishioka, Yukiko; Yoshida, Hidekazu

doi:10.1016/j.conbuildmat.2015.07.071

Cited by 40 publications

(8 citation statements)

References 28 publications

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“…The observation that adding sand reduces shrinkage is expected, as the sand is not involved in the hydration reactions and relative to the gel it has negligible drying shrinkage, of the order of 10 −4 for quartz sand, compared tõ 10 −2 for the gel [15,16].…”

Section: Discussionmentioning

confidence: 80%

Control of drying shrinkage in magnesium silicate hydrate (m-s-h) gel mortars

Zhang

Liang

Liu

et al. 2016

Cement and Concrete Research

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Section: Discussionmentioning

confidence: 80%

Control of drying shrinkage in magnesium silicate hydrate (m-s-h) gel mortars

Zhang

Liang

Liu

et al. 2016

Cement and Concrete Research

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“…A previous study pointed out that the presence of montmorillonite is a factor in the shrinking of aggregates (Sakota 1988), and that clay minerals are pre- Table 35 Chemical composition of used aggregates by XRF analysis (mass%) and LOI . Table 36 Results of cross-polarized microscopy observation of used aggregates after Igarashi et al (2015). (The long side of the pictures has ~7 mm.).…”

Section: Aggregatementioning

confidence: 99%

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Maruyama

Kontani

Takizawa

et al. 2017

ACT

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In 2008, Nuclear and Industrial Safety Agency (NISA) (currently integrated to the Nuclear Regulatory Authority) launched a project to develop a soundness assessment method for concrete members subject to a radiation environment. Presently, the soundness of concrete members subject to radiation is evaluated based on whether the predicted fast neutron fluence and gamma-ray dose values are lower than specific reference values in Japan, which are 1×10 20 n/cm 2 and 2×10 5 kGy, respectively. These reference values were determined based on report by Hilsdorf et al. This project begins by reviewing Hilsdorf et al.'s report, and we find that the scientific evidence for the current reference values is weak. We thus conclude that new experimental research is required to assess the current reference values and to propose a new alternative soundness assessment procedure if needed. We quantitatively evaluated the influence of neutrons, gammarays, and the resultant heating and drying processes on the strength of concrete as well as their underlying mechanisms. The irradiation experiments confirmed the degradation mechanism of concrete due to neutron irradiation. The main reason for this degradation is the metamictization of rock-forming minerals, which, in turn, leads to aggregate expansion. Due to aggregate expansion, cracks around aggregates form, which reduce the compressive strength and Young's modulus of concrete. Among the rock-forming minerals, α-quartz is the most sensitive to neutron radiation.60 Co gamma-ray irradiation experiments demonstrated that concrete strength increased as the gamma-ray dose and gammaray flux does not have a dose-rate impact on the first radiolysis of evaporable water in cement paste within the present study. The effect of gamma-ray irradiation on the properties of concrete is equivalent to that of heating and drying. Concrete strength alteration due to heating and drying is attributed to the colloidal and porous nature of hardened cement paste and crack formation around the aggregate due to a mismatch in the volume changes of the mortar and aggregate. In addition, a numerical analysis code called DEVICE (Damage EValuation for Irradiated ConcretE) is developed to harness knowledge obtained from concrete samples to predict the distribution of the physical properties in concrete members and their changes over time. From these fundamental studies, we propose a new soundness assessment procedure for concrete members subject to radiation. We also recommend a new radiation-induced strength-degradation reference value of 1×10 19 n/cm 2 for fast neutron.

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“…The radius and lattice direction were further combined to form different contact scenarios. In addition, we considered the quartz with silica decorated on the surface as an important scenario in our paper as decoration occurs in many natural conditions such as siliceous rock sedimentation 28 and pervasive pressure solution transfer 29 (the detailed methodology of preparing silica decoration is provided in the Supporting Information, S1).…”

Section: Methodsmentioning

confidence: 99%

Toward the Understanding of Stress-Induced Mineral Dissolution via Molecular Scale Simulations

Ouyang

Chen

et al. 2020

J. Phys. Chem. C

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Stress-induced mineral dissolution at contacts is a critical geophysical process in a broad spectrum of phenomena such as earthquake slip weakening, petroleum migration, and rock deformation. However, there is limited understanding of how this geophysical process originates from the grain-to-grain contacts on a nanoscale. In this study, we simulated the contact process of two quartz asperities in water and present a specially designed molecular dynamics (MD)-based scheme to quantify the dissolution tendency at contacts. Our results suggest that a water layer between the two asperities persists even when the quartz crystals are highly deformed. The MD simulation allowed us to evaluate the thermodynamic activity of the formation of silica species in the solution near the quartz surface. Different from the fact that minerals dissolve significantly at contacts, the finding indicates that only a small region of the contact area adjacent to the center of contacts dissolves first.

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Influence of mineral composition of siliceous rock on its volume change

Cited by 40 publications

References 28 publications

Control of drying shrinkage in magnesium silicate hydrate (m-s-h) gel mortars

Control of drying shrinkage in magnesium silicate hydrate (m-s-h) gel mortars

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Toward the Understanding of Stress-Induced Mineral Dissolution via Molecular Scale Simulations

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