slag concrete air content

slag concrete air content

Standard Specification for Slag Cement for Use in Concrete ...

Slag cement is commonly found in ready-mixed concrete, precast concrete, masonry, soil cement and high temperature resistant building products. While there are many applications and benefits of slag cement, a few are highlighted below …

A Review of ACI 301 Section 4, Concrete Mixtures

The concrete properties considered were slump, air content, and compressive strength. Test data for substitution mix designs were compared with the data for the original mix design. Results show that the substitutions cause variability in concrete properties for both the fly ash and slag …

PROPERTIES OF SELF-COMPACTING CONCRETE WITH SLAG FINE ...

highest level of scaling resistance. Air-cured concrete had higher scaling resistance than concrete cured with commercial curing compounds. The scaling resistance of all grade 120 slag cement concrete was within acceptable limits. Variations in portland cement source caused changes in strength and scaling resistance properties.

A Review on Ground Granulated Blast Slag GGBS in Concrete

Air Content Control Concrete is susceptible to damage from freeze/thaw cycles if it does not contain air. Tiny air bubbles can be created in concrete by using air-entraining admixtures that cause the concrete to foam in the mixing and pouring stage. Fly ash reduces the amount of air entrainment, and concrete mixtures high in fly ash often ...

Testing for Air in concrete| Concrete Construction Magazine

Air void system analysis is required under standard spec 715.2.3.1 for new lab-qualified concrete paving mixes. Testing procedures and interpretation of the super air meter (SAM) number are described in attachment 870-4, Characterization of the Air-Void System of Freshly Mixed Concrete by the Sequential Pressure Method.

Properties and Durability of Alkali-Activated Slag Concrete

May 05, 2017· Concrete's air content is typically unaffected by slag cement. A cementitious material's carbon content can cause changes in the fresh concrete's air content, but slag is devoid of carbon. The lack of carbon helps lower fluctuations and unpredictable variability in entrained air.

Factors Which May Influence Air Content

Self Compactability of Fresh Concrete with Slag Fine Aggregates Table 2Mixture proportions of concrete SP*2, AE, UNIT CONTENT, kg/m' cx% cx% s w C L -G NS ssT | Control 0 165 300 260 880 740 0.4*' FNS-50 50 160 291 252 448 502 746 2.2*3 FNS-100 20 0.55 0.86 55 1.15 100 155 282 245 -1017 756 1.15 2.5*4 CUS-50 50 167 304 243 442 606 737 0.2*4 cus ...

Concrete Durability Requirements Based on ACI

the air content will be 5 ± 1 percent. If further reduction in the air content or the use of non-air-entrained concrete is necessary, prior approval will be obtained from HQDA (DAEN-ECE-G), Wash-ington, DC or the appropriate Air Force major command. e. Cement content. Either the contractor or the contracting officer may be ...

What is Concrete Proportioning? - Slag Cement

Jul 30, 2020· The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. Various types of slag are produced: - Blast-furnace slag—The nonmetallic product, consisting essentially of silicates and aluminosilicates of calcium and of other bases, that is developed in a molten condition …

Slag Cement - Lehigh Hanson, Inc.

The air content of the concrete in the mixer drum may increase when the mixer ... silica fume and granulated blast furnace slag. Metakaolin has no apparent effect on the air content. o Air contents generally decrease with the addition of fly ash. Air

CONSTRUCTION REQUIREMENTS - Tennessee

dioxide from the air ... high metakaolin or slag content are ... by partially replacing cement by various percentages of ground granulated blast furnace slag for M35 grade of concrete …

Ground granulated blast-furnace slag - Wikipedia

In the U.S., blends of slag and portland cements were introduced in 1896. Today, slag cement can account for 30% to 50% of the cement content in concrete. For applications such as mass concrete and in marine environments, that figure can rise to more than 70%.

SECTION 704—CEMENT CONCRETE

Mar 02, 2012· The only ingredient in the concrete that is compressible is the air. Cementitious material, water, and aggregates do not respond to the small rise in pressure. So the pressure change is correlated to the air content of the concrete. Entrained air is formed in concrete using a surfactant. The smaller the bubble, the stronger the bubble.

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

Air content Temperature Resistance to ASR Durability Sulfate resistance Freeze-thaw resistance ... TABLE 4.2.2.1.b.1 — Total air content for concrete exposed to cycles of freezing and thawing 3/4" 7.5 1/2" Nominal maximum ... + pozzolan or slag cement, or IS(<70)(HS)+ pozzolan or slag cement ASTM C1157 NA MS HS

Ground granulated blast-furnace slag - Wikipedia

However, air-entrained alkali-activated slag concrete suffered more damage than Portland cement concrete during the freeze-thaw tests. Pu et al. (1988) (cited by Wang et al., 1995 ) studied the frost resistance of AAS concretes having different strengths (low, medium and high) according to a Chinese standard in which the freezing took place in ...

"Ground Granulated Blast Slag (GGBS) In Concrete – A Review"

Concrete produced with our slag cement CEMSlag TM often yields higher 28-day compressive and flexural strength than comparable products. Reduced heat hydration Concrete produced with CEMSlag TM has lower heat of hydration that reduces thermal cracking, especially important for projects that involve mass concrete structures like dams.

Strength and Durability Characteristics of a 70% Ground ...

Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a …

The Disadvantages of Fly Ash in Concrete | Hunker

Air content Temperature Resistance to ASR Durability Sulfate resistance Freeze-thaw resistance ... TABLE 4.2.2.1.b.1 — Total air content for concrete exposed to cycles of freezing and thawing 3/4" 7.5 1/2" Nominal maximum ... + pozzolan or slag cement, or IS(<70)(HS)+ pozzolan or slag cement ASTM C1157 NA MS HS

Concrete Air Testing: An In-Depth Look - Gilson Co.

entrained air due to fluctuations in LOI and fineness of the fly ash or ground granulated blast furnace slag material. 2. Additional compressive test specimens may be needed to determine strengths for form removal due to the slowed strength development inherent with fly ash or ground granulated blast furnace slag concrete.

STANDARD PRACTICE FOR CONCRETE PAVEMENTS

3. Air Content. Design cement concrete to have an air content of 6.0% in the plastic state. Design AAAP concrete mixes to have an air content of 7.0% in the plastic state. Obtain the air content through the addition of a solution of an air-entraining admixture as specified in Section 704.1(e)4. Use the quantity of air-entraining admixture

SCMs in Concrete: Slag Cement - National Precast Concrete ...

Super Air Meter (SAM) is a modified Type B concrete air meter invented by Tyler Ley, PhD, PE, who promises the SAM will change the way we view concrete's freeze-thaw durability.(To read more about Tyler, see our Tyler Ley Interview blog post with Dr. Ley himself).. The SAM uses an extended test procedure to determine air content and characterize the size and distribution of air …

GGBS - Ground Granulated Blast Furnace Slag for Concrete!

furnace slag as a partial replacement for Portland cement in concrete if the following limits are met: a. Replace no more than 50 percent of the cement by weight. b. Replace the cement with slag at the rate of 1.0 lb (1.0 kg) of slag to 1.0 lb of cement.