Influence of Plasticizing and Siliceous Additives on the Strength Characteristics of Concrete

The influence of the milled opoka of Penza field and blast-furnace slag with the polycarboxylate superplasticizer present on the properties of mortar component of the concrete based on blended cement, including Portland cement, fly ash, blast-furnace slag, silica fume, and microquartz has been investigated. Some equations for the dependency of water requirement of the cement mortar component, as well as of its strength with various values of time on proportion of superplasticizer and components of blended binder have been developed. It has been shown that the introduction of opoka increases the water requirement of the mix, insignificantly decreasing the strength, when proportioned up to 15%. The detrimental effect of opoka on the strength considerably reduces with higher superplasticizer content and lower water-to-cement ratio.

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“…The obtained results allow to consider combined using of opoka and slag as an alternative to fly ash and silica fume [6,19,20].…”

Section: Resultsmentioning

confidence: 99%

Combined Influence of Opoka and Slag on Cement Properties in Presence of Superplasticizer

Коровкин

Ерошкина

2017

SSP

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“…6a). At the temperature of the first short-term heating of 90 the maximum reduction of the strength of high-strength SFRC has been approximately 6% which is slightly less than the reduction of the strength of plane high-strength concrete [23][24][25][26] [16,[23][24]. The increase of the strength of high-strength SFRC compared with the corresponding one of concrete without heating is characteristic for the temperature of short-term heating equal to 150 (Fig.…”

Section: The Effect Of Elevated Temperatures On the Strength And Stramentioning

confidence: 99%

The Strength and Strain of High-strength Concrete Elements with Confinement and Steel Fiber Reinforcement Including the Conditions of the Effect of Elevated Temperatures

Korsun

Vatin

Franchi

et al. 2015

Procedia Engineering

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The article introduces the results of the experimental research of the effect of confinement and steel fiber reinforcement on the strength and strain of the compressed elements of high-modified as well as high-strength SFRC. Analytical expressions to describe the strength and strain of elements with confinement reinforcement under axial compression have been proposed. The results of the research of the effect of concrete age and temperatures elevated up to 150 C on the strength and strain of highstrength SFRC have been introduced.

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“… Measurement of the short-term strength R. At present the concept of greatest non-destructive loading L 0 is usefully employed for expressmonitoring of different kinds of long resistance, such as durability (mechanical [17] and exegetical [18], remaining life of the product [19], longevity [20,21], freeze-thaw resistance [22,23] and cracking resistance [24]. Moreover, there are a vide scope of modern concrete mixtures, such as light-weighted concrete [25], vibropressed structures [26], hight-performance concrete [27], concretes with additives [28,29]. These are also porous materials and, therefore, should be tested for frost-resistance.…”

Section: Offered Methods Of Determining the Freeze-thaw Resistancementioning

confidence: 99%

“…After that curing specimens are sated with water, and measured. Further greatest non-destructive loading of L0 is defined for each specimen by a non-destructive testing, for example, an acoustic emission method [29]. Without outreaching L0, a specimen's crack doesn't develop yet in the conditions of stretching.…”

Section: Realization Of the Offered Methodsmentioning

confidence: 99%

Accelerated method for the determination of freeze-thaw resistance of concrete

Nikolskiy

Pertseva

2015

ETR

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Abstract. Main purpose of this research is to create the new reference method of determining the freeze-thaw resistance of concrete that is characterized by small labor input, high efficiency and a wide application scope. The offered method is based on measurement of long strength by nondestructive method. During this research, the theoretical analysis of concrete's specimen dependence on freeze-thaw resistance and energy, which is emitted by a specimen during destruction, has been carried out. Freeze-thaw resistance of a specimen is calculated as the mathematical relation of these energies, and the freeze-thaw resistance of concrete is calculated as an arithmetic mean value across specimens.To prove the method correctness it was realized on 10 concrete specimens. Age of specimens cosolidation is 88 days. Speciments of concrete mortar were prepared using a mix of portland cement 400 (12,3%), sand of dimentions 0.6-5 mm (24,7%), granite macadam of dimentions 5-20 mm (55,4%) and water (7,4%). Freeze-thaw resistance such mortar was determed earlier by method, approved national standard specification, it was equal 105 cycles. According dimentions by new offered method freeze-thaw resistance such mortar is equal 107 cycles and its confidence interval is equal 5,4 (probability P = 0,95). Therefore, spread of results could be casual and the offered method is correct.

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Influence of Plasticizing and Siliceous Additives on the Strength Characteristics of Concrete

Cited by 10 publications

References 6 publications

Combined Influence of Opoka and Slag on Cement Properties in Presence of Superplasticizer

Combined Influence of Opoka and Slag on Cement Properties in Presence of Superplasticizer

The Strength and Strain of High-strength Concrete Elements with Confinement and Steel Fiber Reinforcement Including the Conditions of the Effect of Elevated Temperatures

Accelerated method for the determination of freeze-thaw resistance of concrete

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