Effects of heating and drying on the strength and stiffness of high-early-strength Portland cement pastes

Kurihara, Ryo; Maruyama, Isao

doi:10.1016/j.cemconcomp.2019.103455

Cited by 13 publications

(3 citation statements)

References 27 publications

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“…%, the specific surface area of the PSCM decreased from 30.06 m 2 •g −1 to 19.03 m 2 •g −1 , while the total pore volume decreased from 0.10 cm 3 •g −1 to 0.06 cm 3 •g −1 . As mentioned above, this result is strongly related to the increase in the density of the PSCM due to the increase in the solid content [35]. Moreover, the variations in solid content can also regulate the compressive strength and porosity of the PSCM.…”

Section: Affect Of Solid Content On the Pscmmentioning

confidence: 80%

Preparation of Porous Silicate Cement Membranes via a One-Step Water-Based Hot–Dry Casting Method

Sun

Wang

Yuan³

et al. 2022

Membranes

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A commercial interest in the improvement in the separation performance and permeability of porous materials is driving efforts to deeply explore new preparation methods. In this study, the porous silicate cement membranes (PSCMs) were successfully prepared through an adjustable combination of hot–dry casting and a cement hydration process. The obtained membrane channel was unidirectional, and the surface layer was dense. The physical characteristics of the PSCMs including their pore morphology, porosity, and compressive strength, were diversified by adjusting the solid content and hot–dry temperature. The results indicated that with the solid content increasing from 40 wt. % to 60 wt. %, the porosity decreased by 8.07%, while the compressive strength improved by 12.46%. As the hot–dry temperature increased from 40 °C to 100 °C, the porosity improved by 23.04% and the BET specific surface area and total pore volume enlarged significantly, while the compressive strength decreased by 27.03%. The pore size distribution of the PSCMs exhibited a layered structure of macropores and mesopores, and the pore size increased with the hot–dry temperature. Overall, the PSCMs, which had typical structures and adjustable physical characteristics, exhibited excellent permeability and separation performance.

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Section: Affect Of Solid Content On the Pscmmentioning

confidence: 80%

Preparation of Porous Silicate Cement Membranes via a One-Step Water-Based Hot–Dry Casting Method

Sun

Wang

Yuan³

et al. 2022

Membranes

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“…C24_O3_E5_G2 exhibited higher strength than C35_O10 from early ages, and it continuously showed higher strength even at 56 and 91 days, i.e., after long-term aging. In general, EPC is favorable for developing early strength, but it has little effect on long-term strength because of its high C 3 S content and high fineness [33,34]. In the scope of this study, using EPC and GGBS as binders was found to effectively develop long-term strength.…”

Section: Porosity Of Inner Concretementioning

confidence: 89%

Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Lee¹,

Lee²

2020

Applied Sciences

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The mixing proportions of concrete were examined with regard to the durability performance and early strength in coastal areas. Research was conducted to improve the C24 mix (characteristic strength of 24 MPa). C35 concrete (characteristic strength of 35 MPa) was selected as a comparison group, as it exhibits the minimum proposed strength criterion for concrete in the marine environment. To secure the early strength of the C24 concrete, 50% of the total ordinary Portland cement (OPC) binder was replaced with early Portland cement (EPC); and to provide durability, 20% was substituted with ground granulated blast-furnace slag (GGBS). In addition, a polycarboxylate (PC)-based superplasticizer was used to reduce the unit water content. The compressive strength, chloride ion diffusion coefficient, chloride penetration depth, and pore structure were evaluated. After one day, the compressive strength improved by 40% when using EPC and GGBS, and an average increase of 20% was observed over 91 days. EPC and GGBS also reduced the overall porosity, which may increase the watertightness of concrete. The salt resistance performance was improved because the rapid early development of strength increased the watertightness of the surface and immobilization of chloride ions, decreasing the chloride diffusion coefficient by 50%.

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“…High early-strength Portland cement (HESPC) is mostly used for rapid construction, cold weather construction and high-quality precast concrete due to its fast hardening characteristics. In the mechanism of early compressive strength development, the increase of compressive strength is accelerated by the heat released by the reacting of a high amount of C 3 S. 5 Therefore, most of the current research focuses on the early-age performance of HESPC, including the effect of curing 6 and mixing conditions 7 on its mechanical properties. Lowheat Portland cement (LHPC) is a special type of cement with dicalcium silicate (C 2 S ≥ 40%) as the dominant mineral and tricalcium aluminate (C 3 A ≤ 7%) as the lower content, 8 which produce low heat of hydration during setting.…”

Section: Introductionmentioning

confidence: 99%

A novel strength prediction model of mortars with different types of cement and SCMs

Sun

Zhao

Cai

et al. 2021

Structural Concrete

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Based on fib Model Code 2010, a time-dependent strength prediction model was improved by reconsidering the coefficient s for the cementitious materials with different types of cement and mix proportions. The relationship between s and mineral composition was investigated experimentally. The results indicate that the values of s show an approximately linear decreasing tendency with the C 3 S + C 3 A content in cement. An empirical function was proposed to describe the variation of s with different water-to-binder (W/b) ratio and different ratios of ground granulated blast furnace slag (GGBS) and fly ash (FA) to the binder, GGBS/b and FA/b ratio. Based on regression analysis, the proposed function presented a correlation of the variation of s with W/b ratios and/or SCM/b ratios. Through the new modified strength prediction model, the predicted results of the compressive strengths of mortars were compared to the experimental results in this study and previous studies. The results show that the new model can provide an accurate evaluation of the early-age strength development of cementitious materials.

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Effects of heating and drying on the strength and stiffness of high-early-strength Portland cement pastes

Cited by 13 publications

References 27 publications

Preparation of Porous Silicate Cement Membranes via a One-Step Water-Based Hot–Dry Casting Method

Preparation of Porous Silicate Cement Membranes via a One-Step Water-Based Hot–Dry Casting Method

Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

A novel strength prediction model of mortars with different types of cement and SCMs

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