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Determination of water/cement-ratio of concrete

2020-11-28  Aalto University, P.O. BOX 11000, 00076 AALTO aalto.fi Abstract of master's thesis 2 Author: Ammad Tauqir Title of thesis: Determination of Water/Cement-Ratio of Concrete Master programme Building Technology Code ENG27 Thesis supervisor: Professor of practice Jouni Punkki Thesis advisor(s): M.Sc Teemu Ojala. Date 09.11.2018 Number of pages 66+14. Language English.

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Determination of water–cement ratio of hardened

2004-11-1  A methodology has been developed for the determination of the water–cement ratio (w/c) in hardened concrete using backscattered electron imaging (BEI) by a scanning electron microscope. The method is based on concrete sections that have been vacuum impregnated with epoxy and polished to a

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Determination of Water/Cement Ratio of Fresh Concrete ...

2020-1-12  BS 1881: Part 2 suggested a method based on buoyancy for determination of water/cement ratio of fresh mix, but later this method was withdrawn by them. Ramme and Naik also used same principle for determining water/cement ratio which need a parameter, aggregate/cement ratio. This ratio may sometimes be unreliable or uncertain.

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Determination of water/cement-ratio of cement

Water/cement-ratio (w/c-ratio) is an important factor affecting quality of the concrete, which has motivated engineers to do research on determining the w/c-ratio. The traditional way to estimate the w/c-ratio by weighing the cement and water from mix design.

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Determination of water-cement ratio of hardened concrete ...

Determination of water-cement ratio of hardened concrete by scanning electron microscopy. A methodology has been developed for the determination of the water-cement ratio (w/c) in hardened concrete using backscattered electron imaging (BEI) by a scanning electron microscope. The method is based on concrete sections that have been vacuum ...

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Determination of Water-Cement Ratio in Hardened

1999-12-1  Title: Determination of Water-Cement Ratio in Hardened Concrete by Optical Fluorescence Microscopy Author(s): U. H. Jakobsen, P. Laugesen, and N. Thaulow Publication: Symposium Paper Volume: 191 Issue: Appears on pages(s): 27-42 Keywords: field tests; fluorescence; microscopy; vacuum forming; water-cement ratio Date: 12/1/1999 Abstract: This paper describes a method for determining the water ...

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Determination of the Water-Cement Ratio of Concrete by

The water-cement ratio can be used to evaluate whether the actual concrete composition complies with the job specifications and also to check the uniformity of the concrete within or between batches. The major advantage of using such a method is that concrete can

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How closely can we determine the water-cement ratio of ...

Generally, a determination of the water-cement ratio (w/c) of hardened concrete is not very useful, but there exist indirect methods for that purpose. A direct method, utilizing optical fluorescence microscopy, has been standardized by a Nordic organization; it requires the use of reference standards of a range of mixes with specific ingredients and a known curing history. The method is useful ...

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Determination of water diffusion coefficient in concrete ...

2018-8-10  concrete cubes (100 mm3) with Grades of concrete ranges from 25 to 40 N/mm2 were prepared and evaluate the concrete water diffusion coefficient in concrete cubes. 3. EXPERIMENTAL PROGRAM In the present research work, six different mixtures type were prepared in total as per BRE, 1988 [15] code standards with a concrete cubes of size (100 mm3).

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Determination of the compressive strength of concrete

A typical concrete mixture was made using proper proportioning of materials (including water) for a given strength, within general limits imposed by the cement content and workability. Three batches of concrete mixtures were prepared, each having a different water-cement ratio of 0.85, 0.8 and 0.65.

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DETERMINATION OF WATER-CEMENT RATIO OF

Determination of water-cement ratio(w/c)of hardened concrete is often required to make plans for repairing and maintenance of deteriorated concrete structure. Establishment of methods to estimate the w/c is also desirable in terms of quality control of concrete cast in situ.

Get Price

Determination of the Water-Cement Ratio of Concrete by

The water-cement ratio can be used to evaluate whether the actual concrete composition complies with the job specifications and also to check the uniformity of the concrete within or between batches. The major advantage of using such a method is that concrete can

Get Price

How to Calculate Water Cement Ratio - Concrete Network

2020-5-8  A low water to cement ratio is the number one issue effecting concrete quality. Low water cement ratio impacts all of the desired properties of concrete listed in the desired properties of concrete section. Use a maximum .50 water to cement ratio when concrete is exposed to freezing and thawing in a moist condition or to deicing chemicals per ...

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Microscopy techniques for determining water–cement (w/c ...

2020-2-17  Water to cement (w/c) ratio is usually the most important parameter specified in concrete design and is sometimes the subject of dispute when a shortfall in concrete strength or durability is an issue. However, determination of w/c ratio in hardened concrete by testing is very difficult once the concrete has set. This paper presents the results from an inter-laboratory round-robin study ...

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An acousto-ultrasonic approach for the determination of ...

2012-10-2  An acousto-ultrasonic approach for the determination of water-to-cement ratio in concrete T.P. Philippidisa,*, D.G. Aggelisb aDepartment of Mechanical Engineering and Aeronautics, University of Patras, P.O. Box 1401, Patras 26500, Greece bInstitute of Chemical Engineering and High Temperature Chemical Processes (ICEHT-FORTH), Patras, Greece Received 6 February 2002; accepted 16

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Water cement ratio formula -Table-Calculation for Mortar ...

Water Cement ratio of different grade of Concrete – Table Normally, we used the water-cement ratio falls under 0.4 to 0.6 per IS Code 10262(2009) for nominal mix i.e. M7.5, M10,M15,M20,M25. Here, M denotes Mix and Number denotes characteristics compressive strength of concrete

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Determination of water diffusion coefficient in concrete ...

2018-8-10  concrete cubes (100 mm3) with Grades of concrete ranges from 25 to 40 N/mm2 were prepared and evaluate the concrete water diffusion coefficient in concrete cubes. 3. EXPERIMENTAL PROGRAM In the present research work, six different mixtures type were prepared in total as per BRE, 1988 [15] code standards with a concrete cubes of size (100 mm3).

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Methods for the determination of water permeability of

1997-5-1  摘要:. Two test methods have been successfully used to determine the water permeability of different concretes. The methods are based on the determination of coefficient of permeability using either a constant flow or a depth of penetration technique. The flow method has generally been found to suit concretes with higher permeability, while ...

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Determination of the Water Diffusivity of Concrete Using ...

2008-7-22  This study focused on the development a reliable method to measure the nonlinear moisture diffusivity of concrete. The approach is based on the analysis of drying and wetting experiments performed with concrete samples of different thicknesses. The transport parameter is obtained by using Richards’ water transport model to analyze the mass ...

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Determination of the compressive strength of concrete

A typical concrete mixture was made using proper proportioning of materials (including water) for a given strength, within general limits imposed by the cement content and workability. Three batches of concrete mixtures were prepared, each having a different water-cement ratio of 0.85, 0.8 and 0.65.

Get Price

DETERMINATION OF WATER-CEMENT RATIO OF

Determination of water-cement ratio(w/c)of hardened concrete is often required to make plans for repairing and maintenance of deteriorated concrete structure. Establishment of methods to estimate the w/c is also desirable in terms of quality control of concrete cast in situ.

Get Price

How to Calculate Water Cement Ratio - Concrete Network

2020-5-8  A low water to cement ratio is the number one issue effecting concrete quality. Low water cement ratio impacts all of the desired properties of concrete listed in the desired properties of concrete section. Use a maximum .50 water to cement ratio when concrete is exposed to freezing and thawing in a moist condition or to deicing chemicals per ...

Get Price

AN ACOUSTO-ULTRASONIC APPROACH FOR THE

AN ACOUSTO-ULTRASONIC APPROACH FOR THE DETERMINATION OF WATER-TO-CEMENT RATIO IN CONCRETE. One factor affecting the strength of concrete is the water content (water-to-cement ratio or w/c): if this ratio is held below a certain value at mixing, the durability and strength of concrete are assumed to be of acceptable standards at later ages.

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Water cement ratio formula -Table-Calculation for Mortar ...

Water Cement ratio of different grade of Concrete – Table Normally, we used the water-cement ratio falls under 0.4 to 0.6 per IS Code 10262(2009) for nominal mix i.e. M7.5, M10,M15,M20,M25. Here, M denotes Mix and Number denotes characteristics compressive strength of concrete

Get Price

Methods for the determination of water permeability of

1997-5-1  摘要:. Two test methods have been successfully used to determine the water permeability of different concretes. The methods are based on the determination of coefficient of permeability using either a constant flow or a depth of penetration technique. The flow method has generally been found to suit concretes with higher permeability, while ...

Get Price

Determination of water diffusion coefficient in concrete ...

2018-8-10  concrete cubes (100 mm3) with Grades of concrete ranges from 25 to 40 N/mm2 were prepared and evaluate the concrete water diffusion coefficient in concrete cubes. 3. EXPERIMENTAL PROGRAM In the present research work, six different mixtures type were prepared in total as per BRE, 1988 [15] code standards with a concrete cubes of size (100 mm3).

Get Price

Determination of the Water Diffusivity of Concrete Using ...

2008-7-22  This study focused on the development a reliable method to measure the nonlinear moisture diffusivity of concrete. The approach is based on the analysis of drying and wetting experiments performed with concrete samples of different thicknesses. The transport parameter is obtained by using Richards’ water transport model to analyze the mass ...

Get Price

Determination of the compressive strength of concrete

A typical concrete mixture was made using proper proportioning of materials (including water) for a given strength, within general limits imposed by the cement content and workability. Three batches of concrete mixtures were prepared, each having a different water-cement ratio of 0.85, 0.8 and 0.65.

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OP-020. CONCRETE MIX DESIGN - G P

2019-8-22  water/cement ratio that may be specified and the lower of these two values used. 20.4. STAGE 2 – SELECTION OF FREE-WATER CONTENT FOR WORKABILITY From Table 3, determine the free-water content depending upon the type (crushed/uncrushed) and maximum size of the aggregate to give a concrete mix with specified slump or Vebe time. 20.5.

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Concrete Bleeding - National Precast Concrete Association

2014-9-17  Bleeding in fresh concrete refers to the process where free water in the mix is pushed upward to the surface due to the settlement of heavier solid particles such as cement and water. Some bleeding is normal but excessive bleeding can be problematic. The way you work that bleed water

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