MgO expansive cement and concrete in China: Past, present

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MgO expansive cement and concrete in China: Past, present ...

Mar 01, 2014  Uniquely, China employs MgO already contained in cement clinker or as an expansive additive to compensate for the thermal shrinkage of mass concrete

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MgO expansive cement and concrete in China: Past, present ...

Uniquely, China employs MgO already contained in cement clinker or as an expansive additive to compensate for the thermal shrinkage of mass concrete

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MgO expansive cement and concrete in China: Past, present ...

Abstract Uniquely, China employs MgO already contained in cement clinker or as an expansive additive to compensate for the thermal shrinkage of mass concrete

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MGO Expansive Cement and Concrete in China, Past Present ...

Author's personal copy MgO expansive cement and concrete in China: Past, present and future Liwu Mo a,, Min Denga,b, Mingshu Tanga,AbirAl-Tabbaac a College of

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MgO expansive cement and concrete in China: Past, present ...

MgO expansive cement and concrete in China: Past, present and future Cement and Concrete Research ( IF 10.933) Pub Date : 2014-03-01, DOI:

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MGO Expansive Cement and Concrete in China, Past

Author's personal copy MgO expansive cement and concrete in China: Past, present and future Liwu Mo a,, Min Denga,b, Mingshu Tanga,AbirAl-Tabbaac a College of Materials Science and Engineering ...

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MgO expansive cement and concrete in China: Past, present ...

MgO expansive cement and concrete in China: Past, present and future Cement and Concrete Research ( IF 10.933) Pub Date : 2014-03-01, DOI: 10.1016/j.cemconres.2013.12.007 Liwu Mo, Min Deng, Mingshu Tang, Abir Al-Tabbaa

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Use of MgO expansion agent to compensate concrete ...

Mar 30, 2019  MgO expansive cement and concrete in China: past, present and future. Cem. Concr. Res., 57 (2014), pp. 1-12. Article Download PDF View Record in Scopus Google Scholar. ... Effects of MgO-based expansive additive on compensating the shrinkage of cement paste under non-wet curing conditions. Cem. Concr. Compos., 34 ...

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(PDF) Expansion of MgO in Cement Pastes Measured by ...

MgO expansive cement and concrete in China: Past, present and future. ... The collective knowledge and experience of MgO expansive cement and concrete is worthy of sharing with relevant engineers ...

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Effects of Different Expansive Agents on the Properties of ...

MgO expansive cement and concrete in China: Past, present and future. ... The collective knowledge and experience of MgO expansive cement and concrete is worthy of sharing with relevant engineers ...

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Expansive Concrete - an overview ScienceDirect Topics

Liwu Mo, Abir Al-Tabbaa, in Magnesia Cements, 2020. 8.3 Performance of concrete with MgO expansive additive 8.3.1 Expansion. The expansion properties of MgO concrete with high MgO content cement, or with incorporated MEA, have been widely investigated. Many variables, as shown in Fig. 8.3, such as reactivity of MgO, the dosage of MgO, the curing conditions in terms of temperature and

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Properties and mechanism of the compound MgO expansive ...

Mar 29, 2021  1. Introduction1.1. MgO expansive agent. MgO is an outstanding type of expansive agent that can compensate shrinkage of concrete both in early and later ages, thus prevent cracking of concrete structure induced by inner tensile stress .Former researches revealed that MgO hydrates into Mg(OH) 2 crystals in binder paste, then small Mg(OH) 2 crystals recrystallize into large crystals,

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(PDF) Effect of Particle Size of Periclase on the ...

Oct 09, 2018  MgO expansive cement and concrete in China: Past, present and future. ... The collective knowledge and experience of MgO expansive cement and concrete is worthy of sharing with relevant engineers ...

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A Review of Magnesium Oxide in Concrete

has a larger volume than its constituents, MgO concrete is expansive. Concrete made with more typical expansive cements like ASTM C 8451 Types M, K, and S expand at early ages. However, most of the volume expansion of MgO concrete occurs at late ages (after 7 days). The expansion of MgO concrete therefore closely matches the shrinkage of

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莫立武-材料科学与工程学院 - njtech.cn

MgO expansive cement and concrete in China: Past, Present and Future. Cement and Concrete Research, 57(2014):1-12. 11. Liwu Mo, D.K. Panesar. Accelerated carbonation- A potential approach to sequester CO2 in cement paste containing slag and reactive MgO. Cement and Concrete Composites, 43(2013): 69-77. 12.

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Expansion Mechanism and Properties of Magnesium Oxide ...

May 05, 2021  The first and latest standard for MgO expansive agent for use in concrete was issued by the China Building Materials Federation and China Concrete and Cement-Based Products Association in 2017 . According to this standard, the product shall conform to the chemical and physical requirements prescribed in Table 1 .

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Concrete - Engineering bibliographies - Cite This For Me

Mar 09, 2016  In-text: (Ali and Mullick, 1998) Your Bibliography: Ali, M. and Mullick, A., 1998. Volume stabilisation of high MgO cement: effect of curing conditions and fly ash addition. Cement and Concrete Research, 28(11), pp.1585-1594.

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MgO-type delayed expansive cement Semantic Scholar

Abstract The idea that MgO can be used as an expansive component in concrete came from practice. The addition of MgO is to compensate the thermal shrinkage during the period of the temperature-decreasing process in mass concrete. In this paper, the delayed expansive properties of MgO and its effects on porosity, pore structure, permeability, sulfate resistance and strength of the hardened ...

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Encapsulated mineral precursors for self-healing cement ...

used in the past as setting accelerator in normal concretes, as an alkali activator in ... encapsulated MgO only one of the capsules contained the reactive powder whereas ... Deng M, Tang M, Al-Tabbaa A. MgO expansive cement and concrete in China: Past, present and future. Cem Concr Res 2014;57:1–12. [8] Qureshi T, Al -Tabbaa A. The effect of ...

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(PDF) Expansion of MgO in Cement Pastes Measured by ...

MgO expansive cement and concrete in China: Past, present and future. ... The collective knowledge and experience of MgO expansive cement and concrete is worthy of sharing with relevant engineers ...

Get Price

Effects of Different Expansive Agents on the Properties of ...

MgO expansive cement and concrete in China: Past, present and future. ... The collective knowledge and experience of MgO expansive cement and concrete is worthy of sharing with relevant engineers ...

Get Price

Expansion Mechanism and Properties of Magnesium Oxide ...

May 05, 2021  The first and latest standard for MgO expansive agent for use in concrete was issued by the China Building Materials Federation and China Concrete and Cement-Based Products Association in 2017 . According to this standard, the product shall conform to the chemical and physical requirements prescribed in Table 1 .

Get Price

Encapsulated mineral precursors for self-healing cement ...

used in the past as setting accelerator in normal concretes, as an alkali activator in ... encapsulated MgO only one of the capsules contained the reactive powder whereas ... Deng M, Tang M, Al-Tabbaa A. MgO expansive cement and concrete in China: Past, present and future. Cem Concr Res 2014;57:1–12. [8] Qureshi T, Al -Tabbaa A. The effect of ...

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Investigation of expansive concrete structures through ...

Jan 03, 2021  The uses of expansive concrete in real applications were also examined in the past decade, e.g. the studies of expansive concrete in post-tension slabs (Richardson et al. 2010), ... MgO expansive cement and concrete in China: Past, present and future. Cement and Concrete Research, 57, 1–12. https: ...

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MgO-type delayed expansive cement Semantic Scholar

Abstract The idea that MgO can be used as an expansive component in concrete came from practice. The addition of MgO is to compensate the thermal shrinkage during the period of the temperature-decreasing process in mass concrete. In this paper, the delayed expansive properties of MgO and its effects on porosity, pore structure, permeability, sulfate resistance and strength of the hardened ...

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Effects of Lightly Burnt MgO Expansive Agent on the ...

Feb 13, 2019  Compensation for shrinkages with three kinds of lightly burnt MgO expansive agent (LBMEA) is used in a reinforced concrete wall poured in the summer. Influences of the internal temperature history on the expansion of concrete and the microstructure of cement paste containing LBMEA were investigated. The results showed that LBMEA exhibited significant expansion around the

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Influence of Lightly Burned MgO on the Mechanical ...

This study aims to study the influence of a lightly burned magnesium oxide (LBMO) expansion agent on the rheological properties (the slump flow, plastic viscosity and variation of shear stress) of cement-based materials. Four different mass contents (i.e., 0%, 3%, 6% and 9%) of LBMO were selected. The following compressive strength and expansion value of the corresponding cement concrete were ...

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Effect of Assembly Unit of Expansive Agents on the ...

This paper studies the influence of assembly unit of expansive agents (CaO and calcium sulphoaluminate) on the limited and free compressive strengths, the limited expansion rate, carbonation resistance, chloride ion penetration resistance and corrosion resistance of reinforcement concrete. The dosages of expansive agent were 0%, 3%, 6%, 9%, and 12% by the total amount of cementitious

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[PDF] Improving efficiency of calcium oxide expansive ...

Calcium oxide-based expansive additive (CEA) has the disadvantages of a too-fast reaction rate when mixed with water and lower storage stability when exposed to the atmosphere, which reduces its expansion efficiency for shrinkage-compensating concrete. This paper introduces a modification technology by encapsulating CEA particles with polylactic acid (PLA) polymer to form a protective

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Magnesia-bearing Materials for Challenging Infrastructure ...

They include concrete with MgO as an expansive additive, pervious concrete, alkali-activated cements, magnesium phosphate cements, carbonated products, stabilising additives for ground ... “MgO expansive cement and concrete in . 108 China: Past, present and

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Effect of Particle Size of Periclase on the Periclase ...

Oct 09, 2018  In this paper, low-heat Portland cement (LHC) clinkers were prepared by calcining raw materials at 1350°C for 2.0 hours, 1400°C for 1.0 hour, 1400°C for 1.5 hours, 1400°C for 2.0 hours, 1450°C for 1.0 hour, and 1450°C for 2.0 hours. The clinkers were ground with gypsum to produce LHC. The particle size of periclase was analysed by BSEM.

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Effect of Particle Size of Periclase on the Periclase ...

Jan 01, 2018  Like conventional Portland cement, MgO as a minor component exists in LHC. MgO as an expansive additive is often used in dam construction to compensate for the slight natural shrinkage of PC during hydration, which can continue for months or years in service [8, 9].

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