Even if an increase in slag aggregates content generates a decrease in the mechanical properties of the final concrete, the loss of strength is very low …
· In contrast, GBF slag concrete showed similar results with that of OPC. These differences of slumps between EAF and GBF mixtures were caused by the difference in the particle size of binders. The addition of fine EAF slag decreases the air content of the concrete mixture, potentially resulting in a decrease of fluidity.
· 5.9. Air Content. Air content of concrete was measured using the method described in ASTM C231. The results are shown in Figure 10. From the figure, the use of SSA resulted in a slight increase in the air content for …
· The influence of air-cooled blast furnace slag aggregates as replacement of natural aggregates on the water absorption of concrete and mortar was studied, and the mechanism was analyzed. The interface between aggregate and matrix in concrete was analyzed by using a micro-hardness tester, a laser confocal microscope and a scanning electron microscope with …
· o There may be a decrease in air content as cement content is increased. o Air content can be affected by the cement manufacturing process resulting in contamination of cement with finish mill oil or grinding agents. Cementitious Supplementary Materials - Air contents are affected by fly ash, silica fume and granulated blast furnace slag.
· HEAVY CONCRETE COMPOSITION USING SLAG BY-PRODUCTS EP10820841.4 () EP2484651B1 () Korea Railroad Research Institute;
· 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 …
Standard ASTM specifications necessary for those working with slag cement are summarized, including ASTM C 989, ASTM C 595, ASTM C 1157. Three pertinent ACI Committee reports also are summarized. This information sheet is a great starting point for anyone who wants to learn more about using slag cement concrete. View Download.
· This expelled air bubbles might increase the air content of the concrete. 4.1.4 Steel Slag Similar to EAFS and BOFS, a slight reduction in slump and increase in fresh density was observed by (Sezer and Gülderen 2015 ) when the conventional coarse and fine aggregates were separately replaced by the steel slag aggregates.
· Ground granulated blast furnace slag also has a lower heat of hydration and, hence, generates less heat during concrete production and curing. GGBFS is a desirable material to utilize in mass concrete placements where control of temperatures is an issue. GGBFS can be used instead of cement with the ratios from 10 to 90%.
· This test method is intended for use with concrete made with relatively dense aggregates. It is not applicable to concrete made with lightweight aggregate or air-cooled blast furnace slag. For these materials use ASTM C 173. B. REFERENCES ASTM C 231 - Air Content of Freshly Mixed Concrete by the Pressure Method
The benefits of using slag cement include: Improved workability. Easier placeability and finishabiltiy. Higher long-term compressive and flexural strengths. Reduced permeability. ASR mitigation properties. Improved durability and …
Portland slag cement, which is most commonly used in the region, was used for the study complying with IS 455 [21].Its specific gravity was 2.87 having initial and final setting times of 70 minutes and 480 minutes, respectively.For fine aggregate, natural sand was used, having a maximum size of 4.75 mm.Its specific gravity was 2.72, conforming to Zone-III, and having a …
Slag cement does not contain carbon and therefore should not cause fluctuations in air content. Slag cement is also compatible with pozzolans such as fly ash or silica fume. The percentage of slag cement to use for maximum strength development is usually between 40 and 50 percent. This is also normally the optimum percentage to use in concrete ...
· Fig. 2 shows the results of the air content for the various types of mixes. Generally, the air content increased when RCA or SSA was introduced. It has been observed that up to 25% replacement, the increase in air content is marginal and close to the expected value of ACI 211.1 for maximum size of aggregate of 20 mm. For the higher percentage ...
The slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. Physical properties of the slag shall be in accordance with the requirements for fineness as determined by air permeability and air content, slag activity index, and compressive strength.
· Blastfurnace slag cement with different slag content (48%, 63% and 78%) and two different strength classes (32,5 and 42,5) were used. Table 1 shows the chemical composition and Table 2 the most important physical properties. ... Table 4: Consistence and air void content of the fresh content * Consistence a 10 and a 45: time in minutes after ...
Slag cement does not contain carbon and does not cause instability in the entrained air content. Time of Set. Time of initial set is influenced by the use of slag cement and fly ash. Concrete made with slag cement can have faster set …
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 ...
Our experimental research was focused on the development of concrete mixture designs with 100% replacement of natural aggregates of fraction 0/32 mm by steel slag of fraction 0/8 mm and air-cooled ...
Use of steel slag in concrete mixtures Nasser Al-Nuaimi, Ramzi Taha, Abdulazeez Kilayil, and Abdelhamid Ben Salem ... Air content (%) Fresh concrete density (kg/m3) Hardened concrete bulk density(kg/m3) 35 347.77 201 709 1076 0 80 0.90 2508.75 2428.97 35 347.77 201 709 0 1076 70 1.20 2705.29 2600.15 35 347.77 201 709 269 807 70 1.40
Ground Granulated Blast Slag GGBS In Concrete – A. 20191012 ensp 0183 ensp Ground Granulated Blast Slag GGBS In Concrete – A Review The glass content of slag‟s suitable for blending with Portland cement typically varies between 90100 and depends on the cooling method and the temperature at which cooling is initiated The glass structure…
· Concrete made with pozzolanic SCMs can continue to gain strength well beyond 28 days, although the rate of strength development steadily slows over time. Slag cement concrete not only boasts increased compressive …
· SiMn slag, a nonferrous metal, is generated in the smelting of SiMn, and has a high Si-based oxide content and low Fe-based oxide content. Frias et al. reported that the fine powder of SiMn slag is appropriate for the use as an aggregate in concrete because it increases volumetric stability when employed as a cement admixture [ 15, 16, 17 ].
SCIC #2, Concrete Proportioning, reviews the benefits of using slag cement and examines procedures for proportioning the material according to ACI 211.1. Slag cement may be proportioned from 20% to 80% of the mix, depending on the application and other conditions that are briefly reviewed. Many producers already offer a selection of concrete ...
· GGBFS blended concrete without Air entraining admixture (AEA) shows significantly lower air content than in a typical OPC concrete. Dose of AEA required to entrain a given volume of air is more for GGBFS blended concrete, …
· The air content of fly ash and slag concrete also varies sig- ... The air content and the slump of concrete decreased by about 146 and …
According to [55], slag cement concrete without an air-entraining admixture show significantly lower air content than ordinary Portland cement concrete, and for the same air content, the dosage of air-entraining admixture should be two times higher. Air entraining of concrete of as much as 5%–6% and high values of water/cement ratio result in ...