Prediction of concrete initial setting time in field

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Prediction of concrete initial setting time in field ...

10%  Nov 03, 2010  Prediction of concrete initial setting time in field conditions through multivariate regression analysis. Mourad Y. Riad 1, Samir Shoukry 2, Eduardo Sosa 1 Gergis William 1 Materials and Structures volume 44, pages 1063–1077 (2011)Cite this article

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(PDF) Prediction of concrete initial setting time in field ...

Construction of large concrete structures usually requires pouring multiple batches of concrete mixes along 1 day, which creates setting irregularities that increase the potential of crack development within pours. ... Prediction of concrete initial setting time in field conditions through multivariate regression analysis. Materials and ...

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Prediction of concrete initial setting time in field ...

Based on the multiple regression analysis method, a prediction model for the initial setting time of concrete mixture under field conditions Materials 2021, 14, 3201 3 of 12 was established. ...

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(PDF) Prediction Model of Concrete Initial Setting Time ...

Jun 10, 2021  wind speed before initial setting, a prediction mo del of initial setting time of concrete in the filed environment was established by means of stepwise regression an alysis. ( a ) ( b )

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Prediction Model of Concrete Initial Setting Time Based on ...

Mass concrete is usually poured in layers. To ensure the interlayer bonding quality of concrete, the lower layer should be kept in a plastic state before the upper layer is added. Ultimately, it will lead to the prediction of concrete setting time as a critical task in concrete pouring. In this experiment, the setting time of concrete in laboratory and field environments was investigated.

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Prediction Model of Concrete Initial Setting Time Based on ...

Jun 10, 2021  Based on the factors that affect concrete setting time, some researchers have provided prediction equations of concrete setting time by using mathematical techniques to train existing data. Ahmadi et al. [21] proposed the functional dependencies between the initial setting time and additives, ambient temperature, relative humidity, and wind ...

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Prediction of concrete setting Request PDF

Final 475 setting time has been evaluated to be when the degree of 476 reaction is a = 0.26 (w/c) for slag cements and silica fume 477 incorporation in the mix while for the other cement types 478 ...

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Prediction of setting time of fly ash concrete

The hardening of concrete depends upon curing temperature and curing time. For FA-based concrete, the setting time was decreased by a factor of six when the temperature was increased from 6 to 80 ...

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Prediction of concrete setting - CORE

With knowledge of the time to initial set, contractors will be able plan measures to finish, texture, and saw cut concrete pavements on time. The point at which final set occurs is of importance, since it provides an estimate of when the concrete strength and stiffness development will start.

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Table 1 Setting Time of Concrete at Various Temperature

Use of Admixture and Its Effects on Setting Time. Initial set, as defined by ACI 116R, is a degree of stiffening of a mixture of cement less than final set, generally stated as an empirical value indicating the time in hours and minutes required for the cement paste to stiffen sufficiently to resist to an established degree, the penetration of a weighted test needle.

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Setting time and compressive strength prediction model of ...

In addition, the relationships among parameters in different concrete samples were found to be linear during the initial and final setting periods and parabolic after the final set at early ages; subsequently, an exponential function prediction model was proposed for modeling the relationships.

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Prediction of concrete initial setting time in field ...

Prediction of concrete initial setting time in field conditions through multivariate regression analysis Autores: Mourad Y. Riad , Samir Shoukry , Eduardo Sosa , Gergis W. William Localización: Materials and structures , ISSN-e 1359-5997, Vol. 44, no. 6, 2011 , págs. 1063-1077

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Table 1 Setting Time of Concrete at Various Temperature

Use of Admixture and Its Effects on Setting Time. Initial set, as defined by ACI 116R, is a degree of stiffening of a mixture of cement less than final set, generally stated as an empirical value indicating the time in hours and minutes required for the cement paste to stiffen sufficiently to resist to an established degree, the penetration of a weighted test needle.

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The early-age prediction of concrete strength using ...

Jan 05, 2021  The prediction of the concrete strength growth at corresponding various temperatures was identified in the maturity investigations of the concrete. The maturity function test predicts the concrete strength gain at a known temperature versus the time record for the concrete specimens cast and cured under standard laboratory conditions.

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The 28-Day Myth - National Precast Concrete Association

Oct 28, 2013  I am looking for a model or set of models and equations that will allow me and my company to make a general prediction of the 28-day break strength of concrete, given the weight, volume and density of cementitious materials, aggregates, air-entrainer, water reducer, other various admixtures, w/c ratio, slump, aggregate size, volume of air, etc.

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ABSTRACT Document: EARLY AGE STRENGTH PREDICTION

concrete blocks and two slabs were prepared in the field during the period of October to December, when the ambient temperature ranged from 15.5 o C (60 o F) to 7.5 o C (45 o F). The in-place compressive strength of the concrete blocks and slabs were predicted based

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Field validation of models for predicting lateral form ...

Nov 01, 2014  As described in DIN 18218:2010-01, the setting time t E can be calculated based on the setting time t E,KB measured with the setting bag test (thumb test), t E = 1.25 t E,KB. The setting of concrete is defined as when the penetration in a concrete specimen is less than 1 mm under an applied thumb force of 50 N.

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Statistical prediction of fracture parameters of concrete ...

Statistical prediction of fracture parameters of concrete and implications for choice of testing standard Zdeneˇk P. Bazˇanta,*, Emilie Becq-Giraudonb aDepartment of Civil Engineering and Materials Science, Northwestern University, Evanston, IL 60208, USA bNorthwestern University, USA Received 4 December 2000; accepted 26 October 2001

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1 Lab Manual of Concrete Technology

For finding out initial setting time, final setting time and soundness of cement, and strength a parameter known as standard consistency has to be used. The standard consistency of a cement paste is defined as that consistency which will permit a Vicat plunger having 10

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What is the use of the initial and final setting time of ...

Initial Setting Time is regarded as the time elapsed between the moment that the water is added to the cement, to the time that the paste starts losing its plasticity. In actual construction dealing with cement paste, mortar or concrete certain ti...

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Fuzzy Logic Model for Prediction of Properties of Fiber ...

Initial setting time (minute) Final setting time (minute) Le Chatelier (mm) Specific gravity (g/cm3) Blaine (cm2/g) 145 195 1 3.15 4150 Table 3. Chemical analysis of Portland cement and fly ash (weight %) Compound Portland cement Fly ash Total SiO2 22.90 57.2 Al2O3 5.32 25.53 Fe2O3 3.63 6.01 CaO 55.83 1.14 MgO 1.99 2.42 SO3 2.62 0.16 Cl 0 0.014

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Early Cracking Risk Prediction Model of Concrete under the ...

Jul 15, 2021  At this time, the temperature deformation of concrete with temperature history between (,) was (shrinkage prediction model of concrete based on temperature field) where is the thermal expansion coefficient of concrete, /°C; is the internal temperature of the concrete at the initial setting, °C; T is the internal temperature of the concrete at ...

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Compaction of Concrete - Boral

Page 3 of 7 > compaction of concrete Table 1 Characteristics and applications of immersion vibrators Diameter Recommended Average Radius of Rate of concrete of head 2frequency1 3,5amplitude action placement 4,5 (mm) (Hz) (mm) (mm) (m3/h per vibrator) Application 20–40 150–250 0.4–0.8 75–150 1–4 High slump concrete in very thin

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How to Estimate In-place Strength of Concrete For ...

Dec 13, 2012  Field-cured test cylinders typically underestimate the true in-place concrete strength because of the thermal mass of a test cylinder (4 in. x 8 in. or 6 in. x 12 in.) as compared to the ...

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Prediction of concrete initial setting time in field ...

Prediction of concrete initial setting time in field conditions through multivariate regression analysis Autores: Mourad Y. Riad , Samir Shoukry , Eduardo Sosa , Gergis W. William Localización: Materials and structures , ISSN-e 1359-5997, Vol. 44, no. 6, 2011 , págs. 1063-1077

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The early-age prediction of concrete strength using ...

Jan 05, 2021  The prediction of the concrete strength growth at corresponding various temperatures was identified in the maturity investigations of the concrete. The maturity function test predicts the concrete strength gain at a known temperature versus the time record for the concrete specimens cast and cured under standard laboratory conditions.

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Standard Test Method for Time of Setting of Concrete ...

5.3 This test method may also be applied to prepared mortars and grouts. However, when the setting time of concrete is desired, the test shall be performed on mortar sieved from the concrete mixture and not on a prepared mortar intended to simulate the mortar fraction of the concrete; it has been shown that the initial and final setting times may be increased when using the prepared mortar.

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Setting Time Prediction - Calmetrix Downloads Site

Application Note AN-C06 ©!2015!Calmetrix,!Inc.!–!Do!not!reproduce!withoutpermission! Settingtimeestimation’and’prediction’using’isothermal’calorimetry’

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Early Cracking Risk Prediction Model of Concrete under the ...

Jul 15, 2021  At this time, the temperature deformation of concrete with temperature history between (,) was (shrinkage prediction model of concrete based on temperature field) where is the thermal expansion coefficient of concrete, /°C; is the internal temperature of the concrete at the initial setting, °C; T is the internal temperature of the concrete at ...

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Initial and Final Setting time of Cement Effects How ...

Oct 06, 2017  Significance of calculating Initial and final setting time of cement:-. Well, After mixing cement with water, it takes time to place the cement paste in position, initial setting time possess a primary role in strength it is mandated that cement paste or concrete is placed in position before it crosses initial setting time. i.e.,30mins.

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Prediction of some properties of retempered concrete in ...

concrete stiffened with time, some of the water of the mix absorbed by the aggregate and some is lost by evaporation. Particularly if the concrete is exposed to sun or wind and some is removed by the initial chemical reactions. This loss of mix water lead to reduction in slump or compacting factor therefore reduction in workability of the concrete.

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Methods for Nondestructive Testing of Early- - Concrete

It was concluded that if a certain value of wave velocity is defined as the criterion for the time of initial or final set then the impact-echo method could be used as a tool to evaluate if the concrete has reached this velocity. The value of the P-wave velocity that was found to correlate to the time of initial set

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Frontiers Prediction of Rubber Fiber Concrete Strength ...

Jan 28, 2021  Based on this data set, there are six influencing factors; rubber content, rubber particle size, and polypropylene fiber content are considered as the input variables, and the 28-day concrete compression, splitting tensile, and flexural strength are considered as the output variables. A strength prediction model of rubber fiber concrete is ...

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Properties of Concrete - Workability, Setting, Bleeding ...

Mar 19, 2017  Fresh concrete is that stage of concrete in which concrete can be moulded and it is in plastic state. This is also called "Green Concrete". Another term used to describe the state of fresh concrete is consistence, which is the ease with which concrete will flow. The transition process of changing of concrete from plastic state to hardened state.

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(PDF) Prediction of Compressive Strength of Concrete by ...

In the competitive nature of construction, concrete has a versatile use in the construction practice. The compressive strength of concrete is mostly used criterion in producing concrete. However testing for compressive strength of concrete specimens

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ALLOWABLE LIMITS FOR CONDUCTIVITY TEST METHODS AND ...

coefficient prediction of concrete structures exposed to marine environments by enrique a. vivas a dissertation presented to the graduate school of the university of florida in partial fulfillment of the requirements for the degree of doctor of philosophy university of florida 2007

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Prediction of pile set-up in clays and sands

Prediction of pile set-up in clays and sands W M Yan1 and K V Yuen2 1 Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong 2 Department of Civil and Environmental Engineering, University of Macau, Taipa, Macau Email: [email protected], [email protected] Abstract.Increase in pile capacity after initial driving has been well observed in

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Machine learning enables prompt prediction of hydration ...

Feb 16, 2021  Statistical parameters shown in Figs. 4, S2, and S3 reveal an important trend: the RF model produces more accurate predictions of cement hydration kinetics at later ages (i.e., time

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