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  • The Effect of Sulfate on the Electrical Properties of ,
    The Effect of Sulfate on the Electrical Properties of ,

    a new insight into how damage is caused by sodiumMaterials: The cement paste specimens were prepared by sulfate in natural geological and archaeological one [2] mixing the ordinary Portland cement paste (OPC) with The effect of concrete by sulfates attack of an sodium sulfate salt due to the ratio 5,000ppm, 10,000ppm

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  • Testing Chloride Penetration Resistance of Concrete
    Testing Chloride Penetration Resistance of Concrete

    concrete is obviously related to the pore structure of the cement paste matrix This will be influenced by the water-cement ratio of the concrete, the inclusion of supplementary cementing materials which serve to subdivide the pore structure [McGrath, 1996], and the degree of hydration of the concrete The

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  • Pore Structure of Calcium Sulfoaluminate Paste and ,
    Pore Structure of Calcium Sulfoaluminate Paste and ,

    Mercury intrusion and nitrogen sorption porosimetry were employed to investigate the pore structure of calcium sulfoaluminate (CSA) and portland cement pastes with cement ,

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  • Pore Structure of Cement Pastes Mixed with Inorganic Salts
    Pore Structure of Cement Pastes Mixed with Inorganic Salts

    The influence of salts on concrete durability,pore structure of cement pastes with inorganic salts,including CaCl2,NaCl,Na2SO4,NaNO2,Ca(NO3)2 and Ca(NO2)2,was studied through mercury intrusion porosimetry (MIP),and hydration degree of each paste was also testedThe results show that porosity of the paste with inorganic salt cured for 3 d or 28 d was related with its hydration ,

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  • Pore Structure - ScientificNet
    Pore Structure - ScientificNet

    Abstract: Inorganic salts are important admixtures usually used in cold weather concrete As research basic of influence of salts on concrete durability, effects of inorganic salts on pore structure of cement paste were studied in this paper, and possible implications of concrete property with pore structure was also analyzed

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  • Effect of Heat Treatment on the Pore Structure and Drying ,
    Effect of Heat Treatment on the Pore Structure and Drying ,

    Effect of Heat Treatment on the Pore Structure and Drying Shrinkage Behavior of Hydrated Cement Paste Jeffrey J Thomas , the effects of a short heat treatment on cement paste, and the thermal expansion behavior of saturated and dry cement paste , Quantitative discrimination of the nano-pore-structure of cement paste during drying: New .

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  • CONCRETE DURABILITY AS INFLUENCED BY DENSITY ,
    CONCRETE DURABILITY AS INFLUENCED BY DENSITY ,

    CONCRETE DURABILITY AS INFLUENCED BY DENSITY AND/OR POROSITY By Tarun R Naik , a large extent Concrete density is inversely proportional to its porosity The ingress of aggressive agents into the pore structure is responsible for various durability problems in concrete structur , cement paste, formation of compounds such as .

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  • 4 Microstructure Development of Cement Paste Phases | NIST
    4 Microstructure Development of Cement Paste Phases | NIST

    This chapter covers the modelling of cement hydration, cement paste microstructure, and the nanostructure of C-S-H The models and techniques described in this chapter are in the process of revolutionizing the study of the microstructure- property relationships of cement-based materials at the cement paste level

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  • Correlation between pore structure and low-temperature ,
    Correlation between pore structure and low-temperature ,

    The pore structure and low-temperature dilataion behaviour of a traditional hydrated Portland cement paste and a special cement paste of high initial strength were investigated The aim of the investigation was to demonstrate the role of the cement type in developing the pore structure and frost dilatation during the hydration process

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  • Effect of desulphurised waste on long-term porosity and ,
    Effect of desulphurised waste on long-term porosity and ,

    Original research article Effect of desulphurised waste on long-term porosity and pore structure of blended cement pastes Jamal M Khatib a, *, Lee Wright b, Pal S Mangat c a Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV11LY, UK b Pick Everard, Leicester LE1 1HA, UK c Centre for Infrastructure Management, Shef field Hallam University, Shef eld S1 1WB, UK

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  • ELECTRIC CONDUCTIVITY OF HARDENED CEMENT PASTE WITH ,
    ELECTRIC CONDUCTIVITY OF HARDENED CEMENT PASTE WITH ,

    Hardened cement paste with various inorganic electrolytes was prepared for investigating the effect of pore structure and pore solution on electric conductivity and transport properti As a result, it was shown that the correlation between the total pore volume measured by mercury intrusion method and the apparent diffusivity of the chloride .

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  • Autogenous Self-Healing in Blast Furnace Slag Cement by ,
    Autogenous Self-Healing in Blast Furnace Slag Cement by ,

    Autogenous Self-Healing in Blast Furnace Slag Cement by Sodium Monofluorophosphate J Kempl and O Çopuroğlu CiTG, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands

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  • Influence of SiO2@PMHS on the Water Absorption of Cement ,
    Influence of [email protected] on the Water Absorption of Cement ,

    silane, makes the pores in the concrete structure water repellent through the formation of an organic film (Cui, Liu, Chen, Li, & Shi, 2012; Guo et al, 2015) The other one is inorganic coating, like nano-SiO 2 Hou, Xin, Qian, and Zhang (2015a) found that organic TEOS was ,

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  • Effect of fly ash on the pore structure of cement paste ,
    Effect of fly ash on the pore structure of cement paste ,

    32 Pore structure of cement paste blended with fly ash The permeability of concrete is mainly controlled by the pore structure of the hydrated cement paste , The porosity, pore size, pore size distribution and critical pore width are main pore structure parameters characterizing the pore structure of hydrated cement paste

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  • Effect of Cement Type on Autogenous Deformation of Cement ,
    Effect of Cement Type on Autogenous Deformation of Cement ,

    The main findings of this study are: 1) self-desiccation shrinkage can be related to self-desiccation both for Portland and for BFS cement pastes, taking into account the influence of the dissolved salts in the pore solution, 2) the BFS cement paste studied shows pronounced self-desiccation and self-desiccation shrinkage, mainly caused by its .

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  • Experimental study on pore connectivity and its influence ,
    Experimental study on pore connectivity and its influence ,

    The pore structures of cement paste with a water-cement ratio of 03 and 05 in mass, containing inorganic salts admixture (CaCl2, Na2SO4, NaNO2 and Ca(NO3)2) were studied by mercury intrusion .

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  • Effects of bentonite on pore structure and permeability of ,
    Effects of bentonite on pore structure and permeability of ,

    Nov 10, 2019· In order to further reveal the effect of bentonite on the pore structure of cement mortar, the capillaries were divided into three types of pores with sizes of 6–50 (small capillary pores), 50–10 3 (medium capillary pores), and 10 3-10 5 nm (large capillary pores), respectively, and the small capillary pores have little effect on .

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  • SINTEF REPORT
    SINTEF REPORT

    SINTEF REPORT TITLE , steel reinforced concrete Inorganic salts of nitrate (for setting) and thiocyanate (for hardening) are , state of the cement paste, while in the latter case the accelerator acts primarily in the hardened state Some accelerators affect either setting or hardening, while several accelerate both setting .

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  • Effect of pore structure on salt crystallization damage of ,
    Effect of pore structure on salt crystallization damage of ,

    Request PDF | Effect of pore structure on salt crystallization damage of cement-based materials: Consideration of w/b and nanoparticle use | In this study, the influence of pore structure on the .

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  • Fractal Theory Used in Pore Structure of Cement-Based ,
    Fractal Theory Used in Pore Structure of Cement-Based ,

    Effect of Inorganic Salts on Pore Structure of Cement Paste , Fractal Theory Used in Pore Structure of Cement-Based Materials Incorporated Phosphorus Slag p384 Design on the Concrete Structure Durability of the Relocation of Shougang and the Steel Project Construction of Caofeidian , volume increment of solid phase and packing density of .

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  • Pore structure and mechanical properties of cement-lime ,
    Pore structure and mechanical properties of cement-lime ,

    materials such as: the viscosity of lime-cement paste [5], the effect of aggregate composition in pozzolan repair mortars [8], and the effect of silica fume addition [9] Our research group has studied the pore structure and capillary porosity [10] and the variation of microstructure during the carbonation of lime [11] in blended past

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  • Effect of fly ash on the corrosion resistance of magnesium ,
    Effect of fly ash on the corrosion resistance of magnesium ,

    In order to explore the effect of fly ash on the corrosion resistance of magnesium potassium phosphate cement (MKPC) paste in sulfate solution, pure MKPC pastes (M0) and MKPC pastes containing 20% fly ash (M1) were prepared and soaked in water and 5% Na 2 SO 4 solution for long-term immersion corrosion test The strength, volume deformation and water absorption rate of MKPC paste ,

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  • Effects of Carbonation on the Microstructure of Cement ,
    Effects of Carbonation on the Microstructure of Cement ,

    Abstract The objective of this work was to examine the influence of carbonation on the microstructure of cement materials Different materials, which were CEM I mortar and paste, CEM II mortar and paste, were carbonated at 20 °C, 65 % relative humidity and 20 % of CO 2 concentration The specific surface area and pore size distribution were determined from two methods: nitrogen adsorption .

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  • CE Materials Quiz 3 Flashcards | Quizlet
    CE Materials Quiz 3 Flashcards | Quizlet

    Hydrated cement paste having lower bulk specific gravity than the cement particl , They reduce the surface tension of concrete's pore fluid, which decreases the magnitude of capillary stresses and therefore shrinkage strain , -Soluble inorganic salts-Soluble organic compounds-Quick-setting admixtures-Solid admixtur Retarding .

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  • Analysis of the Influence of Organic Corrosion Inhibitors ,
    Analysis of the Influence of Organic Corrosion Inhibitors ,

    concrete and the chloride salt penetrates into the , simulate the actual concrete structure curing conditions Then the initial state of the internal reinforcement in the specimen was tested The , For reinforcement in concrete with organic and inorganic corrosion inhibitors, the

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  • Effect of corrosion inhibitors on cement paste pore structure
    Effect of corrosion inhibitors on cement paste pore structure

    The influence of admixed corrosion inhibitors on the pore structure of cement paste was evaluated by means of mercury intrusion porosimetry Portland cement CEM I 52-5N was used Two different corrosion inhibitors were selected within this study One was a calcium nitrite-based corrosion inhibitor, which contained minimum 30 % active ingredients by mass

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  • Characterization and comparison of capillary pore ,
    Characterization and comparison of capillary pore ,

    cement paste is simulated at 20 C A microstruc-ture with the same porosity (273%) as CT-1d is adopted and named as HYMO-1d HYMO-1d is digitized with a resolution of 05 lm/voxel 3 Capillary pore size distributionof digital cement pastes To characterize the pore structure of a digital

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  • Effect of pore characteristics and chloride binding on ,
    Effect of pore characteristics and chloride binding on ,

    through the cement paste and the relative strengths of Cl-binding mechanisms It is known that permeability plays an imperative role in ion ingress as it controls the rate of advective flow of solutes [8], and the permeability of cement pastes is primarily controlled by the porosity and pore structure of the cement paste

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  • The effects of seawater on the hydration, microstructure ,
    The effects of seawater on the hydration, microstructure ,

    It can be clearly seen that the replacement of demineralized water with seawater has a beneficial effect on decreasing the porosity of cement paste after 28 days of curing Total porosity of SW0 was decreased by 12% in comparison with DW0 In addition, noticeable refinement of the pore structure ,

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  • MICROSTRUCTURE-BASED PREDICTION MODEL FOR ,
    MICROSTRUCTURE-BASED PREDICTION MODEL FOR ,

    Microstructure-based prediction model for chloride ion diusivity in hydrated cement paste Ceramics – Silikáty 61 (2) 110-118 (2017) 111 Mori-Tanaka theory and self-consistent theory etc [15] The prediction model is built based on the microstructure using homogenization theories to determine cement paste diffusivity PREDICTION MODEL BASED

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