methodology to evaluate variations in concrete color

Leave Comment

Methodology to evaluate variations in concrete color ...

Oct 16, 2020  10%  An experimental program was conducted to develop a methodology to quantify the gradation of the concrete color. The proposed methodology was used to evaluate the effect of the supplementary cementitious materials and the limestone filler used as partial substitution of white cement in architectural precast concrete. The effect of the formwork materials on concrete color

Get price

Methodology to evaluate variations in concrete color ...

The corresponded paste mixtures were prepared to evaluate the variations in concrete color with the time under the air-curing conditions. The proposed methodology was found to provide precise ...

Get price

Materials and Structures Volume 53, issue 6

Dec 11, 2020  Methodology to evaluate variations in concrete color caused by white cement substitutions and forming materials Authors. Wael A. Megid; Kamal H. Khayat; Content type: Original Article; Published: 16 October 2020; Article: 132

Get price

(PDF) Color pigments in concrete and their properties

The corresponded paste mixtures were prepared to evaluate the variations in concrete color with the time under the air-curing conditions. The proposed methodology was found to provide precise ...

Get price

Guide to Evaluation of Strength Test Results of Concrete

measured strength of concrete originate from two sources: † Batch-to-batch variations can result from changes to the ingredients or proportions of ingredients, water-cementi-tious material ratio (w/cm), mixing, transporting, placing, sampling of the batch, consolidating, and curing; and † Within-batch variations, also called within-test ...

Get price

Davis Colors Manufacturing Colored Concrete Masonry ...

the color of concrete to deviate a maxi-mum of 5 percent unless specified lower and follows an ASTM D2244 test method to certify architectural precast panels. A 5 percent color variation is less than would be seen in natural cut lime-stone, but more than would be encoun-tered with high-quality, sandblasted architectural precast panels.

Get price

Methodology to evaluate variations in concrete color ...

An experimental program was conducted to develop a methodology to quantify the gradation of the concrete color. The proposed methodology was used to evaluate the effect of the supplementary cementitious materials and the limestone filler used as partial substitution of white cement in architectural precast concrete. The effect of the formwork materials on concrete color was also investigated.

Get price

Guide to Evaluation of Strength Test Results of Concrete

measured strength of concrete originate from two sources: † Batch-to-batch variations can result from changes to the ingredients or proportions of ingredients, water-cementi-tious material ratio (w/cm), mixing, transporting, placing, sampling of the batch, consolidating, and curing; and † Within-batch variations, also called within-test ...

Get price

ACI 214R-11 Guide to Evaluation of Strength Test Results ...

measured strength of concrete originate from two sources: † Batch-to-batch variations can result from changes to the ingredients or proportions of ingredients, water-cementi-tious material ratio (w/cm), mixing, transporting, placing, sampling of the batch, consolidating, and curing; and † Within-batch variations, also called within-test ...

Get price

Evaluation of Statistical Quality Control of Concrete

Variations in strength test results can be traced to two different sources: 1. Variations in testing methods; and 2. Variations in the properties or proportions of the constituent materials in the concrete mixture, variations in the production, delivery or handling procedures, and variations

Get price

Coloring Concrete - How to Color Concrete - The Concrete ...

Oct 20, 2020  When different batches of concrete vary slightly on the same job, they may absorb stain or dye differently, resulting in noticeable color variations. Inconsistencies in finishing practices, timing of operations, and curing and sealing methods can also result in slight color variations. Consider custom color

Get price

Evaluating and Diagnosing Formed Surface Imperfections ...

Additionally, variations with precast product vibration, form stripping time and curing conditions can lead to reduced uniform color conditions on the concrete surface. As described in ACI 309R-05, “The formed concrete finish should be observed when the form is stripped so that appropriate corrective measures can be expeditiously implemented.”

Get price

Norm method to define and evaluate robustness of self ...

Feb 10, 2018  Norm method to define and evaluate robustness of self-compacting concrete due to component quantity variations. ... a good consistency was found between the proposed method and a previous robustness evaluation method thus proving that the proposed methods can be regarded as a concise and effective tool to define and evaluate the robustness of ...

Get price

METHOD FOR THE ALEATORY SAMPLING AND STATISTICAL ...

method for the aleatory sampling and statistical evaluation of mechanical strengths and dimensio­ nal variations of the concrete paving blocks 1 2 juan j. howland dr., eng., adjunct professor instituto superior polltecnico "jose a. echeverria" staff researcher ministry of

Get price

Aggregates for Concrete - Memphis

invaluable in evaluating aggregates. In the absence of a performance record, the aggregates should be tested before they are used in concrete. The most commonly used aggregates—sand, gravel, crushed stone, and air-cooled blast-furnace slag—produce freshly mixed normal-weight concrete with a density (unit weight) of 2200 to 2400 kg/m. 3 (140 ...

Get price

Investigation of the Potential for Evaluation of Concrete ...

Adoption of periodic or continuous monitoring strategies to assess condition state of infrastructure elements is a vital part of service life management (SLM). NDT methods are increasingly seen as an attractive and viable strategy to support condition monitoring. Over the last 15 years, the LEME research group at UFRGS has investigated several aspects related to the use of the ultrasonic pulse ...

Get price

Concrete Mix Design Manual Rev08-19 - NCDOT

The properties of concrete can also be affected through production, placement, finishing, and curing practices. It is therefore important that concrete mixes are designed, produced, placed, cured, and tested by competent individuals. The learning objectives for this course include: Understand the ACI Absolute Volume Method of concrete mix design

Get price

Thermal modulation of nonlinear ultrasonic wave for ...

May 17, 2019  In this work, we propose a new nonlinear ultrasonic test method to evaluate concrete damage using thermal modulation of ultrasonic waves. We observed linear relationships between the relative velocity changes and temperature variations on four concrete prisms. The prism with a higher damage level shows higher sensitivity to temperature changes.

Get price

Tilt mapping for zigzag-shaped concrete panel in retaining ...

May 05, 2021  There are two anchors installed at the center of the concrete panel to reinforce it, and hence, tilt is the main behavior of it. Therefore, this paper proposed is the P2P-TA (Plane-to-Plane-Tilt Angle) comparison method to evaluate the variation of the tilt angles of concrete

Get price

Quantitative evaluation of cement paste carbonation using ...

Jun 25, 2021  Spraying the phenolphthalein indicator on the carbonated cement is one conventional method to assess the carbonation depth 8 and it is recognized as the most convenient method to capture the color ...

Get price

Evaluating and Diagnosing Formed Surface Imperfections ...

Additionally, variations with precast product vibration, form stripping time and curing conditions can lead to reduced uniform color conditions on the concrete surface. As described in ACI 309R-05, “The formed concrete finish should be observed when the form is stripped so that appropriate corrective measures can be expeditiously implemented.”

Get price

CONCRETE MATERIALS AND TESTING - MnDOT

5-694.113 CEMENTITIOUS MATERIAL COLOR It is recognized that the color of a concrete surface is affected by other factors in addition to the color of the cementitious material. These may include water content, method and time of finishing, cement content, conditions of forms (in the case of formed surfaces), fly ash, and possibly others.

Get price

Colormesh: A novel method for quantifying variation in ...

Jul 17, 2020  Color variation is one of the most obvious examples of variation in nature. Objective quantification and interpretation of variation in color and complex patterns is challenging. Assessment of variation in color patterns is limited by the reduction of color into categorical measures and lack of spatial information. We present Colormesh as a novel method for analyzing complex color patterns ...

Get price

Concrete Pavement Mixture Design and Analysis (MDA ...

The work to evaluate and refine the test was conducted in three phases: 1. Assess whether the VKelly test can signal variations in laboratory mixtures with a range of materials and proportions 2. Run the VKelly test in the field at a number of construction sites 3.

Get price

Aggregates for Concrete - Memphis

invaluable in evaluating aggregates. In the absence of a performance record, the aggregates should be tested before they are used in concrete. The most commonly used aggregates—sand, gravel, crushed stone, and air-cooled blast-furnace slag—produce freshly mixed normal-weight concrete with a density (unit weight) of 2200 to 2400 kg/m. 3 (140 ...

Get price

Guideline for Practical Use of Methods for Testing the ...

variations that should also be taken into account. Owing to its important role with regard to durability of concrete structures, many methods have been proposed for testing chloride ingress in concrete, although the above complexity has up to now hindered to reach a general agreement on a single test method. A collection of

Get price

3 METHODS OF DETERMINING WORKABILITY OF CONCRETE ...

Oct 29, 2015  Different Test Methods for Workability Measurement Depending upon the water cement ratio in the concrete mix, the workability may be determined by the following three methods. Slump Test Compaction Factor Test Vee-bee Consistometer Test 1. Slump Test Suitability This method is suitable only for the concrete of high workability. This test is carried out with []

Get price

September 1, 2003 CONCRETE MANUAL 5-694.500

September 1, 2003 CONCRETE MANUAL 5-694.500 CONCRETE TESTS 5-694.500 5-694.501 SAMPLING OF CONCRETE Taking concrete samples at the point-of-placement rather than the point-of-delivery is always preferable. Special situations may occur which create difficulties in sampling and transporting samples taken from the point-of-pl acement.

Get price

Practical Semi-Adiabatic Calorimetry for Concrete Mixture ...

Aug 10, 2018  Set time evaluation with SAC Methods under development for a C 403 alternative: Highly insulated samples of concrete or mortar Mathematical procedures for determining set time from data - “Derivatives” - “Fractions” - “4th order fit” Relative time-of-set comparisons can be made using a

Get price

Problem Clinic: Why Does Concrete Discolor? Concrete ...

Jul 24, 2008  The slab may be artistically blended to a more uniform color, but the effectiveness of this approach highly depends on the specific slab (concrete mixture, surface density, ambient conditions, etc.). Also, as the slab ages and becomes worn by normal usage, the colored areas may not maintain the uniform appearance initially created by the artist.

Get price

Dear author, Please note that changes made in the online ...

1 3 Norm method to define and evaluate robustness of self-compacting 4 concrete due to component quantity variations 5 6 7 Wenqiang Zuo a,b,c, Jiaping Liua,b,c,⇑, Qian Tianb,c,⇑, Wen Xub,c ...

Get price

Pavement Manual: Concrete Pavement Repair

Use Item 720, “Repair of Spalling in Concrete Pavement,” or Item 721, “Fiber Reinforce Polymer Patching Material,” for situations where the deteriorated concrete is shallower than the mid-depth of the slab. For emergency work or temporary repair, Item 700, “Pothole Repair,” may be

Get price

3D Ultrasonic Tomography Technique as a tool to Evaluate ...

most commonly used in the assessment of concrete structures. This method is widely used for evaluation of concrete due to its effectiveness, ease of implementation and low cost. The UPV tests are characterized by an NDT method that aims to detect defects or internal discontinuities present in various types of materials.

Get price

Research Methods Definitions, Types, Examples

Research methods are specific procedures for collecting and analyzing data. Developing your research methods is an integral part of your research design. When planning your methods, there are two key decisions you will make. First, decide how you will collect data. Your methods depend on what type of data you need to answer your research question:

Get price
Contact us

Submit online

Please leave a message below and we will contact you as soon as possible.