midrange water reducers and air content concrete
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Mid-Range Water Reducers and Air Content Concrete ...

Feb 01, 1998  Mid-Range Water Reducers and Air Content. Mid-range water-reducing admixtures (MRWRAs) provide many benefits, but occasionally produce an unwanted effect: unintentionally entrained air. MRWRAs have several features that make them particularly suitable for many of today's ready-mixed concrete applications. They include achieving the 5- to 8-inch ...

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Mid-range water reducers and air content

Manual on Control of Air Content in C o n c r e t e , EB 116, Portland Cement Association and National Ready Mixed Concrete Association, 1998. Mid-range water reducers and air content These admixtures provide many benefits but occasionally produce unwanted air When using mid-range water reducers in non-air-entrained concrete for machine-troweled

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How Mid-range Water Reducers Enhance Concrete Performance

How Mid-range Water Reducers Enhance Concrete Performance BY GLENN E. SCHAEFER In addition to their influence on water content, slump, and strength, these new admixtures improve concrete placement and finishability and are uniquely suited to the needs of the flatwork contractor Figure 1. Effects of various dosages on setting times for standard ...

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Water Reducers - North America

Water Reducers Reducing the water content of concrete. There are three types of water reducing admixtures for concrete: High-range, mid-range and normal: High-range water reducers provide outstanding engineering performance and or concrete workability. Mid-range water reducers provide

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Mid Range Water Reducer - Sika USA

When used as a mid range water reducing admixture, water reduction up to 12 % can be obtained. This application is ideal for use with lean, harsh ready mix concrete mixes or concrete containing fly ash. SikaPlast®-500 will improve workability and finishability. When used as a high range water reducing admixture, water reduction up to 20 % can ...

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Use of Water Reducers, Retarders, and Superplasticizer

Reducing the water content in a mixture may result in a stiffer mixture, which reduces the workability and increases potential placement problems. Water reducers, retarders, and superplasticizers are admixtures for concrete, which are added in order to reduce the water content in a

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Mid-Range Water Reducers - Euclid Chemical

Mid-Range Water Reducers are used to reduce the water demand between 5% and 15%, achieve longer slump retention and give greater workability to concrete then normal ASTM C 494 Type A water reducers.

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Water Reducers, Mid-Range - North America

Mid-range water-reducing admixtures promote superior workability and finishing of concrete, and improve concrete performance with excellent early strength and rheology. Non-chloride admixtures. Facilitates finishing to achieve desired surface appearance. Optimizes water reduction.

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High Range Water Reducer - Sika

Mid Range Water Reducing Applications: At a lower dosage, Sikament®-686 can be used as a cost effective mid range water reducing admixture or simply as a water reducing admixture for production of conventional slump concrete. When used as a mid range water reducing admixture, water reduction up to 15 % can be obtained. This application is ...

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Factors Which May Influence Air Content - RussTech

o The addition of water reducers retarders normally slightly increase air contents. o The addition of accelerators, both chloride and non-chloride decrease air content. o Superplasticizers mid-range water reducers increase air content. Polycarboxylate-based admixtures increase air content considerably.

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MIRA® Mid-Range Water Reducers - GCPAT

MIRA® 110 is a linear dose mid-range and high-range water-reducing admixture, manufactured under rigorous quality control to ensure uniform, predictable performance. MIRA 110 does not contain added calcium chloride. Key Benefits. Mid-range and high-range

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MID-RANGE WATER REDUCERS (MRWR) FOR CONCRETS - SIKA ...

This is the current solution of choice in the MRWR (Mid Range Water Reducing) ready mix concrete market dealing with not washed crushed aggregates with high content of fines. This solution provides water-reductions in the order of 10-14%, and keeps the workability of the samples with a mixture effect of setting time retarders and air entrained ...

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Chemical Admixtures - Portland Cement Association

These admixtures reduce water content by at least 8 percent and tend to be more stable over a wider range of temperatures. Mid-range water reducers provide more consistent setting times than standard water reducers. Retarding admixtures, which slow the setting rate of concrete, are used to counteract the accelerating effect of hot weather on ...

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Revealing the Mystery of Admixtures: Water-Reducing and ...

May 29, 2010  Mid-range water-reducing admixtures were developed to increase the slump beyond the range available with regular water reducers without the excessive retardation that had been known to occur. High-range water reducers, commonly called superplasticizers, were developed for high-strength and high-performance concrete applications.

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water reducers Civil Engineering

Mar 09, 2015  These admixtures reduce water content by at least 8 percent and tend to be more stable over a wider range of temperatures. Mid-range water reducers provide more consistent setting times than standard water reducers. Retarding admixtures, which slow the setting rate of concrete, are used to counteract the accelerating effect of hot weather on ...

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DARACEM® 55 Resource GCP Applied Technologies

Nov 29, 2018  Specifications. Concrete shall be designed in accordance with Standard Recommended Practice for Selecting Proportions for Concrete, ACI 211.. The water-reducing admixture shall be a mid-range water-reducing admixture such as Daracem 55 as manufactured by GCP Applied Technologies, or

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What is a Water Reducer? (with pictures)

Water reducers are usually divided into three groups. Low-range or normal water reducers can reduce the amount of water needed for a certain concrete mix by 5%. Mid-range water reducers can decrease the amount of water used by 15%, and can also help keep the setting time for the concrete more stable, giving more control over how quickly or ...

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The effect of air content on concrete strength

The effect of air content on concrete strength. Q. How does air content affect strength? A. Intentionally entrained air voids improve the resistance of concrete to damage from cycles of freezing and thawing.Any air voids reduce the strength of concrete, with about a 5% reduction in strength for each 1% increase in the volume of air voids.

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Sikament®-686 High Range Water Reducers

Mid Range Water Reducing Applications: At a lower dosage, Sikament®-686 can be used as a cost effective mid range water reducing admixture or simply as a water reducing admixture for production of conventional slump concrete. When used as a mid range water reducing admixture, water reduction up to 15 % can be obtained. This application is ...

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High Range Water Reducer - Sika

Mid Range Water Reducing Applications: At a lower dosage, Sikament®-686 can be used as a cost effective mid range water reducing admixture or simply as a water reducing admixture for production of conventional slump concrete. When used as a mid range water reducing admixture, water reduction up to 15 % can be obtained. This application is ...

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Reducing Shrinkage Cracking of Structural Concrete Through ...

Mar 31, 2006  MRWRA Mid-Range Water-Reducing Admixture S1 Shrinkage-reducing admixture 1 (Eucon SRA from Euclid) S2 Shrinkage-reducing admixture 2 (Eclipse Plus from Grace) ... Fresh concrete mixtures had an air content of 6 ± 1.5% and slump of 1 to 4 inches. Sealed

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EUCON X15 - Euclid Chemical

Mid-Range Water Reducing Admixture. EUCON X15 is a mid-range water-reducing and plasticizing admixture for concrete. EUCON X15 shows improved finishing characteristics when compared to other commonly used Type A (typically 5-6% water reduction) or Type F (typically 12-15% water reduction) admixtures.

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Admixtures for Concrete - Memphis

tity of mixing water required to produce concrete of a certain slump, reduce water-cement ratio, reduce cement content, or increase slump. Typical water reducers reduce the water content by approximately 5% to 10%. Adding a water-reducing admixture to concrete without reducing the water content can produce a mixture with a higher slump.

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Concrete Pavement Mixture Design and Analysis (MDA ...

Based on the data presented, it was found that a minimum air content of 3.5 percent in the concrete and 11.0 percent in the paste should yield concrete durable in the ASTM C 666 with modern AEAs and low or no lignosulfonate water reducers (WRs).

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High Range Water Reducer - Sika

Mid Range Water Reducing Applications: At a lower dosage, Sikament®-686 can be used as a cost effective mid range water reducing admixture or simply as a water reducing admixture for production of conventional slump concrete. When used as a mid range water reducing admixture, water reduction up to 15 % can be obtained. This application is ...

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A Closer Look: Water-Reducing Admixtures - NPCA

Oct 05, 2020  Water reducers in this range are usually made of lignosulfonates, hydroxycarboxylic acids or carbohydrates. When used at high dosages, low-range water reducers can prolong concrete’s set time. Mid-range water reducers. Mid-range water reducers typically reduce water content by 10 to 15% for concrete with a slump range from 5-to-8 inches.

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MIRA® VL12 Mid-range water reducer with superior slump ...

MIRA VL12 is a Mid-range Water-reducing Admixture (MWR) designed to improve concrete quality by providing extended slump life (slump retention) for critical pre-mixed and precast applications. Ideal for use in mid-strength concrete grades (25 to 50MPa), where extended concrete workability

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What is a Water Reducer? (with pictures)

Water reducers are usually divided into three groups. Low-range or normal water reducers can reduce the amount of water needed for a certain concrete mix by 5%. Mid-range water reducers can decrease the amount of water used by 15%, and can also help keep the setting time for the concrete more stable, giving more control over how quickly or ...

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Chemical Admixtures - The Concrete Portal

Mid-range water reducers are typically low dosage or low active ingredient products based on superplasticizers. Sequence of addition of water reducers. Generally, water reducers are added along with the mix water to the concrete mixture. ... Just providing an adequate air content inside concrete is not sufficient. Small and stable air bubbles ...

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Concrete Additives - Gold and Sons Ready Mix

Minimal impact on concrete air content; Better control of water reduction and setting times as compared to traditional lignin-based water reducers; Synergistic performance of polycarboxylate-based mid-range and high-range water reducers, which include water reduction, concrete strength and air control

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Reducing Shrinkage Cracking of Structural Concrete Through ...

Mar 31, 2006  MRWRA Mid-Range Water-Reducing Admixture S1 Shrinkage-reducing admixture 1 (Eucon SRA from Euclid) S2 Shrinkage-reducing admixture 2 (Eclipse Plus from Grace) ... Fresh concrete mixtures had an air content of 6 ± 1.5% and slump of 1 to 4 inches. Sealed

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ADMIXTURES FOR CONCRETE - Conspro

WATER REDUCERS KB-1200 Finishing Aid / Water Reducer KB-1200 is used in all concrete where ease of placement, normal set times and increased workability are desired. Used in all flatwork, curb mixes and walls, KB-1200 is compatible with a wide range of cements, fly ashes and aggregates.

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Matls IM 529, revised 4/21/20

3. The total quantity of water in the concrete, including water in the aggregate, shall not exceed the maximum water to cement and fly ash ratio. 4. Type I, Type II, Type III, Type IP, and Type IS Cement shall be used as provided for in the specifications. All cement shall be from an

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NEW GENERATION OF CHEMICAL ADMIXTURES FOR

Firstly, the water content in the mix plays an important role. Higher the water content in the mix, the lower the yield stress and plastic viscosity. Figure 3. Bingham model An ICAR rheometer has been used to measure, compare and study the fundamental flow properties of concrete containing admixtures based on MPE and PCE. Extensive laboratory

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Mid-Range Water Reducing Admixture

Mid-Range water reducers, allowing cement content economics. The product can be used in a wide range of applications, and will develop higher ultimate strength than MIRA 52. The choice of the most appropriate product should generally be based on full concrete trials. MIRA 53 is based on blended modified lignosulphonates and is a powerful ...

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Class F Fly Ash Assessment for Use in Concrete

This research evaluated the performance of Class F fly ash concrete with cementitious material content to 280 kg/m. 3 (470 lb/yd. 3), which can be attractive for the design of sustainable concrete pavements. The combination of fly ash (Class C and/or F), chemical (mid-range and high range water reducing) admixtures and air-entraining

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DS-09033 (Replaces DS-09014) DEVELOPMENTAL

• Air content according to Article 2403.03, C, 3, of the Standard Specifications, except with a target of 6.5% and a maximum variation of plus 2.0% and minus 1.0% 2. The HPC mix for the substructure may be a CV-HPC-S with a mid range water reducer admixture and a w/c ratio of 0.42, with a maximum w/c ratio of 0.45.

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Seven Must-Use Concrete Admixtures (Additives)

Aug 16, 2021  One problem associated with using a high range water reducer in concrete is slump loss. High workability concrete containing superplasticizer can be made with a high freeze-thaw resistance, but air content must be increased relative to concrete without superplasticizer.

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