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lowtemperature curing strength enhancement in cement

lowtemperature curing strength enhancement in cement

Low-Temperature Curing Strength Enhancement in Cement ...

The strength enhancement observed in the PLC cements is related to the cement hydration products formed in the presence of carbonates as a function of temperature. Keywords: Compressive strength; X-ray diffraction; heat release; limestone powder; low-temperature curing; thermodynamics.

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Low Temperature Curing Strength Enhancement in Cement ...

May 01, 2017  In the present study, the relationship between heat release and compressive strength of mortars at batching/curing temperatures of 10 °C and 23 °C is investigated. For Portland-limestone cements (PLC) with limestone additions on the order of 10 %, a higher strength per unit heat release is obtained after only 7 d of curing in lime water.

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Low-temperature curing strength enhancement in cement ...

Apr 28, 2017  10%  In the present study, the relationship between heat release and compressive strength of mortars at batching/curing temperatures of 10 and 23 °C is investigated. For Portland-limestone cements (PLC) with limestone additions on the order of 10%, a higher strength per unit heat release is obtained after only 7 d of curing in lime water.

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Published in Materials and Structures ... - concrete.nist.gov

Low-Temperature Curing Strength Enhancement in Cement-Based Materials Containing Limestone Powder Dale P. Bentz1 Paul E. Stutzman1 Franco Zunino2,a 1Engineering Laboratory National Institute of Standards and Technology 100 Bureau Drive, Stop 8615 Gaithersburg, MD 20899-8615 E-mail: [email protected], [email protected]

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Low Temperature Curing of Metakaolin Concrete Journal of ...

Aug 08, 2009  The influence of low temperature curing on the performance of concrete containing metakaolin (MK) is investigated. Portland cement was partially replaced with 0–30% MK. The water to binder ratio was maintained at 0.5 for all mixes.

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concrete.nist.gov NIST

concrete.nist.gov NIST

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Low Temperature Curing of Metakaolin Concrete Journal of ...

Aug 08, 2009  During the first day of hydration, the concrete strength is substantially reduced especially at high MK content. However, the incorporation of up to 20% MK causes an enhancement in concrete strength beyond 7 days of curing. This increase could be up to 50% depending upon the age of curing and the MK content.

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Low Temperature Curing of Metakaolin Concrete

During the first day of hydration, the concrete strength is substantially reduced especially at high MK content. However, the incorporation of up to 20% MK causes an enhancement in concrete strength beyond 7 days of curing. This increase could be up to 50% depending upon the age of curing and the MK content. After 28 days of curing the relative ...

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CompressiveStrengthGainBehaviorandPredictionof Cement ...

conducted tests of calcium sulphoaluminate cement at differentcuringtemperatures ... D.P.Bentz,P.E.Stutzman,andF.Zunino,“Low-temperature curing strength enhancement in cement-based materials containing limestone powder, ...

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Preparation and Properties of Low-Temperature Early ...

Mar 22, 2021  To solve the problem that the low temperature leads to the slow development of cement strength in deepwater cementing, we prepared low-temperature early strength material of nano-C-S-H gel seed with sodium silicate nonahydrate and calcium nitrate tetrahydrate as raw materials. The chemical structure and elemental composition of nanometer C-S-H gel seed were characterized by FT

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Low carbon design of an Ultra-High Performance Concrete ...

Dec 10, 2019  Besides, the drawback of PS in normal strength concrete (serious retarding effect) can be greatly weakened in UHPC cementitious system. Consequently, it is logic to produce UHPC with advanced characteristics by using PS. ... Low-temperature curing strength enhancement in cement-based materials containing limestone powder. Mater. Struct., 50 (3 ...

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The Influence of Casting and Curing Temperature on the ...

KEYWORDS: Casting temperatures,curing compressive strength, final set,initial slump, temperature effects. ABSTRACT: Concretes, made with two different cements, were cast in the laboratory at temperatures of 10,23 and 32°C (50, 73, and 90”F). The concrete mix design was held constant for each cement used in the study. Fresh properties,

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Compressive Strength Gain Behavior and Prediction of ...

Mar 30, 2020  For cement-based materials, the curing temperature determines the strength gain rate and the value of compressive strength. In this paper, the 5% cement-stabilized macadam mixture is used. Three indoor controlled temperature curing and one outdoor natural curing scenarios are designed and implemented to study the strength development scenario law of compressive strength,

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Effect of Curing Condition on Compressive Strength of Fly ...

Mar 01, 2018  Title: Effect of Curing Condition on Compressive Strength of Fly Ash Geopolymer Concrete Author(s): Hongen Zhang, Xiaoshuang Shi, and Qingyuan Wang Publication: Materials Journal Volume: 115 Issue: 2 Appears on pages(s): 191-196 Keywords: compressive strength; curing conditions; low-calcium fly ash; ordinary portland cement Date: 3/1/2018 Abstract: In this study, compressive strength

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Effect of Calcium Nitrate on the Properties of Portland ...

Mar 25, 2021  The most efficient use of CN is achieved at -5 °C for compressive strength enlargement; a 1% CN dosage ensures the compressive strength of samples at a -5 °C initial curing temperature, with high early strength cement exceeding 3.5 MPa but being less than the required 3.5 MPa in samples with normal early strength cement.

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Dale P. Bentz -Research and Publications - concrete.nist.gov

Bentz, D.P., and Hansen, K.K., "Preliminary Observations of Water Movement in Cement Pastes During Curing Using X-ray Absorption," Cement and Concrete Research, 30 (7), 1157-1168, 2000. pdf version Bentz, D.P., "Influence of Silica Fume on Diffusivity in Cement-Based Materials.

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Table 3 from Reducing setting time of blended cement paste ...

Table 3. Compressive strength results of cement paste samples at 3 d and 7 d (STD indicates standard deviation). - "Reducing setting time of blended cement paste containing high-SO3 fly ash (HSFA) using chemical/physical accelerators and by fly ash pre-washing."

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(PDF) Dog Wool Microparticles/Polyurethane Composite for ...

A polyurethane (PU)-based eco-composite foam was prepared using dog wool fibers as a filler. Fibers were acquired from pet shops and alkaline treated prior to use. The influence of their incorporation on the PU foams’ morphological, thermal, and

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Części książek: „Recycled asphalt pavement (RAP)” – Grafiati

The effect of the RAP replacement, water to cement ratio, curing time, and aggregate water absorption on compressive strength and flow workability are reported. The results show that the mixing water and mixing time play a significant role in the compressive strength and unit weight of CM containing RAP.

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Low Temperature Curing of Metakaolin Concrete

During the first day of hydration, the concrete strength is substantially reduced especially at high MK content. However, the incorporation of up to 20% MK causes an enhancement in concrete strength beyond 7 days of curing. This increase could be up to 50% depending upon the age of curing and the MK content. After 28 days of curing the relative ...

get price

Low Temperature Curing of Metakaolin Concrete Journal of ...

The influence of low temperature curing on the performance of concrete containing metakaolin (MK) is investigated. Portland cement was partially replaced with 0–30% MK. The water to binder ratio wa...

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Low Temperature Curing of Metakaolin Concrete Journal of ...

The influence of low temperature curing on the performance of concrete containing metakaolin (MK) is investigated. Portland cement was partially replaced with 0–30% MK. The water to binder ratio wa...

get price

Curing Concrete – Normal, Hot and Cold Weather

For most concrete structures, the curing period at temperatures above 5º C (40º F) should be a minimum of 7 days or until 70% of the specified compressive or flexural strength is attained. The period can be reduced to 3 days if high early strength concrete is used and the

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Study report SR146 Reactive powder concrete

The low flexural tensile strength of concrete has a number of undesirable consequences ... Strength gain by low temperature curing..... 20 Figure 12. Strength gain by higher temperature curing [modified CaO/SiO ... enhancement of the microstructure by heat treatment after hardening . 2

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Curing Concrete, Chapter 12 - Memphis

period. Fig. 12-2 shows the strength gain of concrete with age for different moist curing periods and Fig. 12-3 shows the relative strength gain of concrete cured at different temperatures. CHAPTER 12 Curing Concrete Fig. 12-1. Curing should begin as soon as the concrete stiffens enough to prevent marring or erosion of the sur-face.

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Internal curing effect on strength of recycled concrete ...

Oct 30, 2017  As shown in Fig. 13, core concrete keep full of basic internal curing effect with the internal curing water supplied by brick when recycled concrete is kept under normal conditions, but water loss happened in the edge concrete in the process of curing, causing inadequate internal curing effect in the later period. While recycled concrete is ...

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Types of Admixtures for Concrete - The Concrete Network

Nov 03, 2020  Strength Enhancement. Concrete strength enhancement can be achieved through use of superplasticizer admixtures to produce a low water/cement ratio giving high performance concrete. ... Set retarders permit application of higher temperature curing of precast/prestressed concrete without negatively affecting the ultimate strength. Applications ...

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Effect of Carbon Dioxide Curing on Strength Development of ...

This study was conducted to assess the acceleration of strength development by CO2 curing and to evaluate the strength and microstructure of two cement mortars. Three curing pressures (1, 5, 8 bars), three curing time (20, 120, 180 minutes) and four CO2 concentration (0%, 25%, 50% and 100%) were used in this investigation. Two mortar specimens are made with Type Ι Portland cement and oil-well ...

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Strength of Oil Well Cements at Downhole Pressure ...

The theory and technique of triaxial compression testing are fully discussed in earlier reports. Briefly, cylindrical specimens 1-in. long and 0.5-in. in diameter are jacketed in thin copper tubes of negligible strength, placed in the test chamber and subjected to an external confining pressure of kerosene and loaded axially by the piston at a strain rate of 1 per cent per minute.

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Effect of Calcium Nitrate on the Properties of Portland ...

Mar 25, 2021  The most efficient use of CN is achieved at -5 °C for compressive strength enlargement; a 1% CN dosage ensures the compressive strength of samples at a -5 °C initial curing temperature, with high early strength cement exceeding 3.5 MPa but being less than the required 3.5 MPa in samples with normal early strength cement.

get price

Low carbon design of an Ultra-High Performance Concrete ...

Dec 10, 2019  Besides, the drawback of PS in normal strength concrete (serious retarding effect) can be greatly weakened in UHPC cementitious system. Consequently, it is logic to produce UHPC with advanced characteristics by using PS. ... Low-temperature curing strength enhancement in cement-based materials containing limestone powder. Mater. Struct., 50 (3 ...

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What Are the Advantages of CSA Cement? - Oreworld Trade ...

Fast-curing cement is used in many applications that require rapid strength enhancement, such as bridge decks, airport runways, repairing roads, sidewalks, etc. In addition, CSA cement is sometimes used in shrinkage-compensating concrete by mixing with Portland cement, and as a controllable low-strength material, and for backfilling public ...

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Materials Free Full-Text Investigation of the ...

When concrete is used for construction in cold-temperature regions, cold-resistant accelerators based on calcium nitrite (Ca(NO2)2) and calcium nitrate (Ca(NO3)2) are added to prevent early freezing damage. Although cold-resistant accelerators increase the early compressive strength and prevent early freezing damage by promoting cement hydration, the strength enhancement effect owing to the ...

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