Cement Paste Affected

Cement Paste Affected

Self-healing of cracks in cement paste affected by ...

2014-2-27  Self-healing of cracks in cement paste affected by additional Ca 2+ ions in the healing agent. Haoliang Huang and Guang Ye. Journal of Intelligent Material Systems and Structures 2014 26: 3, 309-320 Download Citation. If you have the appropriate software installed, you can download article citation data to the citation manager of your choice ...

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Effect of Fineness on the Properties of Cement Paste ...

Properties of cement paste were affected significently by fineness of cement which is one of the most important influence factors. Effect of fineness on the rheology properties, strength, hydration and pore structure of cement was studied. The results showed that: plastic viscosity of the cement paste can be reduced by the increase of cement fineness to some extent.

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Self-healing of cracks in cement paste affected by ...

Request PDF Self-healing of cracks in cement paste affected by additional Ca2+ ions of healing agent Cracks in reinforced concrete provide preferential access for aggressive substances into ...

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Effect of Particle Size on the Properties of Cement Paste

actions affect all the properties of the cement paste including its consistency. These chemical reactions are in most instances arrested at an early stage and thereafter pro-ceed at relatively slow rates. There is now a very large body of evidence supporting the general occurrence of occlusion-type reactions in concentrated suspensions. Two 18

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Pore structure of affected zone around saturated and large ...

2019-3-1  The cement paste around SAP would be directly affected by the absorption and desorption of SAP. With contact of water, the SAP would absorb part of the mixing water. If no additional water is introduced to compensate the loss in workability, densification of hardened cement paste would be observed [37,46,47], due to

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Effect of Fineness on the Properties of Cement Paste

Properties of cement paste were affected significently by fineness of cement which is one of the most important influence factors. Effect of fineness on the rheology properties, strength ...

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Impact of accelerated carbonation on OPC cement paste ...

2015-1-1  In the case of OPC cement pastes (w/c ranging from 0.3 to 0.6), Pihlajavaara, was the first to point out that carbonation affects the capillary pores with diameters between 10 and 100 nm by globally reducing their volume.

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Turbidity-based measurement of bleeding in fresh cement ...

This study examined bleeding in cement paste as affected by cellulose nanofibres prepared with varying the content of carboxyl groups that were grafted onto the fibre surface. Alongside the conventional ASTM test method, bleeding was further evaluated using a turbidity scanner.

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Cement Paste - an overview ScienceDirect Topics

A cement paste was cast on a piece of CFRP cut longitudinally in order to create the flat surface required for DRX measurement. The cement paste was in contact with the fibers as well as the epoxy surface of the CFRP rods. The cement paste at the interface with the CFRP was tested at 2, 7, 14, and 28 days.

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Chloride in cement Advances in Cement Research

2015-3-2  Plain cement paste is not much affected by chloride except for increased solubilisation of cement solids, but chloride is detrimental to the passivation of embedded steel. Emphasis is placed on establishing the underlying physicochemical concepts and mechanisms of corrosion, and integrating these into a holistic picture.

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Self-healing of hardened cement paste affected by ...

A self-healing phenomenon, in which the cracks become partially refilled as a result of rehydration of cement particles and deposition of CaCO 3 , has been observed in narrow cracks under a constant supply of moisture. Also, according to previous studies, the self-healing performance can be maximized by changing the temperature and pH to control the crystal form of CaCO3.

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Effect of Fineness on the Properties of Cement Paste ...

Properties of cement paste were affected significently by fineness of cement which is one of the most important influence factors. Effect of fineness on the rheology properties, strength, hydration and pore structure of cement was studied. The results showed that: plastic viscosity of the cement paste can be reduced by the increase of cement fineness to some extent.

More

Self-healing of cracks in cement paste affected by

2020-9-21  Self-healing of cracks in cement paste affected by additional Ca2+ ions in the healing agent 领域 材料科学 腐蚀 离子 复合材料 碳化作用 饱和(化学) 硫酸盐 自愈 透气比表面积 蒸馏水

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Volume Stability of Cement Paste Containing Limestone

The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss of water and chemical reactions. Incorporating limestone fines (LF) as a cement replacement can affect the shrinkage of the paste. To examine this effect, five paste mixes were prepared with 0, 5, 10, 15 and 20% LF as a cement replacement and with a water-to-binder ratio (w/b) of 0.45.

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The Effect of Water to Cement Ratio on Early Age ...

2019-7-1  1 Cement paste. Cement and water were mixed initially with the mixer being rotated at 140 rpm for 30s. The mixer was stopped after 1 minute and then the mixing was resumed at 285 rpm for 2 min 30s. The cement paste adhering to the sides of mixer was scraped and mixed for another 2 min 30s following the 1 min break.

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Chloride in cement Advances in Cement Research

2015-3-2  Plain cement paste is not much affected by chloride except for increased solubilisation of cement solids, but chloride is detrimental to the passivation of embedded steel. Emphasis is placed on establishing the underlying physicochemical concepts and mechanisms of corrosion, and integrating these into a holistic picture.

More

Dynamic modulus of Portland cement paste and mortar as ...

2020-1-22  Results are given of an investigation into the influence of drying and wetting on changes in weight and dynamic modulus of paste and mortar specimens dried at different relative humidities at room ...

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Alkali activated fly ash: effect of admixtures on paste ...

2009-2-12  In this paper, an investigation related to the rheological behaviour of alkali-activated fly-ash pastes (AAFA) is described. Those pastes were prepared by mixing the fly ash with an alkaline dissolution containing 85% of a 12.5 M NaOH solution and 15% of waterglass and adding some commercial chemical admixtures usually used in the Portland cement concrete fabrication, like

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Effect of Waste Ceramic Powder on Properties of Alkali ...

2 天前  Research on the application of cement with added waste ceramic powder (WCP) has been conducted. The main components of WCP are SiO2 and Al2O3 [11,18]. Li et al. [19] reported that WCP could be used as a pozzolanic supplement for cement. Their results showed that the replacement of cement with WCP can refine the pore structure. In addi-

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Cement hydration - Understanding Cement

Hydration products. The products of the reaction between cement and water are termed "hydration products." In concrete (or mortar or other cementitious materials) there are typically four main types: Calcium silicate hydrate: this is the main reaction product and is the main source of concrete strength. It is often abbreviated, using cement

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Volume Stability of Cement Paste Containing Limestone

The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss of water and chemical reactions. Incorporating limestone fines (LF) as a cement replacement can affect the shrinkage of the paste. To examine this effect, five paste mixes were prepared with 0, 5, 10, 15 and 20% LF as a cement replacement and with a water-to-binder ratio (w/b) of 0.45.

More

The Effect of Water to Cement Ratio on Early Age ...

2019-7-1  1 Cement paste. Cement and water were mixed initially with the mixer being rotated at 140 rpm for 30s. The mixer was stopped after 1 minute and then the mixing was resumed at 285 rpm for 2 min 30s. The cement paste adhering to the sides of mixer was scraped and mixed for another 2 min 30s following the 1 min break.

More

8 FACTORS AFFECTING SETTING HARDENING OF

2016-9-22  If the cement consumption is unchanged, the increase of the mixing water content will enhance the amount of capillary porosities, lower the strength of cement paste, and extend the setting time. Therefore, in practical projects, the amount of water and cement will be changed without modifying the water-cement ratio (the minimum amount of cement ...

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Portland Cement Setting Time – Pavement Interactive

Cement paste setting time is affected by a number of items including: cement fineness, water-cement ratio, chemical content (especially gypsum content) and admixtures. Setting tests are used to characterize how a particular cement paste sets. For construction purposes, the initial set must not be too soon and the final set must not be too late.

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Dynamic modulus of Portland cement paste and mortar as ...

2020-1-22  Results are given of an investigation into the influence of drying and wetting on changes in weight and dynamic modulus of paste and mortar specimens dried at different relative humidities at room ...

More

Alkali activated fly ash: effect of admixtures on paste ...

2009-2-12  In this paper, an investigation related to the rheological behaviour of alkali-activated fly-ash pastes (AAFA) is described. Those pastes were prepared by mixing the fly ash with an alkaline dissolution containing 85% of a 12.5 M NaOH solution and 15% of waterglass and adding some commercial chemical admixtures usually used in the Portland cement concrete fabrication, like

More

Production of high-early-compressive-strength Portland ...

2020-1-22  Portland cement paste Microwave-accelerated heating ABSTRACT The use of low-pressure microwave (MW)–accelerated heating and curing in the production of high-early-strength Portland cement paste (CP) in relation to the processing characteristics and factors affected is investigated. The

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Effect of Cement Content on Concrete Performance

2020-10-13  Cement content can affect Class S(AE) bridge deck concrete. This study looks at furthering these findings through additional testing of fresh and hardened properties of Class S(AE) concrete, to better determine how the mix proportions can change concrete

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Types and Causes of Concrete Deterioration

2014-4-14  is significantly increased in concrete with a high water-to-cement ratio, low cement content, short curing period, low strength, and highly permeable or porous paste. Carbonation is highly dependent on the relative humidity of the concrete. The highest rates of carbonation occur when the relative humidity is maintained between 50% and 75%. Below

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The Interfacial Transition Zone (ITZ) Between Cement Paste ...

This paper describes the so called interfacial transition zone—ITZ—in concrete. This is the region of the cement paste around the aggregate particles, which is perturbed by the presence of the aggregate. Its origin lies in the packing of the cement grains against the much larger aggregate, which leads to a local increase in porosity and predominance of smaller cement

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