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how does slag cement affect time of set

Concrete Set Time Slag Cement

How Does Slag Cement Affect Time of Set? At temperatures less than 85 degrees Fahrenheit, concrete containing slag cement can have longer times of set, when compared with 100 percent portland cement concrete. The lower the ambient and/or concrete temperatures, the slower the set times will be (Figure 1).

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Slag cement with fly ash Slag Cement Association

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 times than concrete made with fly ash (Figure 2). Pumpability and Finishability. Pumpability with slag cement

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Slag Cement an overview ScienceDirect Topics

If the slag cement particles are finer than the Portland cement particles, the rate of bleeding will decrease, and in contrast, if the slag cement particles are coarser than the Portland cement particles, bleeding will increase when substituted on an equal-mass basis. The setting time of concrete containing slag cement is commonly retarded.

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Slag Cement Questions

Slag cement concrete sometimes turns green for a short period of time due to the oxidation state of sulfide sulphur compounds during portland/slag cement hydration. This is normally a temporary condition and the concrete, upon exposure to air and sunlight, will ultimately become lighter than 100% portland cement concrete.

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Slag Cement precast Concrete

How Does Slag Cement Affect Color? Slag cement is lighter in color than portland cement. Elements made with slag cement will therefore have a lighter finished color. The higher the percentage of slag cement used, the lighter the color will be. This provides greater visibility of

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(PDF) Effect of Slag Cement on Drying Shrinkage of Concrete

The effect of a partial replacement of cement with slag cement on free shrinkage is evaluated for curing periods between 3 and 28 days. Mixtures include concrete containing different replacement

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Slag Cement Benefits and Use in Concrete Slag Cement News

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 and detailed information sheets are located here.

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LEHIGH SLAG CEMENT PRODUCT DATA SHEET

same factors affect the set time of concretes made with slag cement as with ordinary portland cement. Generally, the higher the slag cement dosage, the slower the set time. This provides some advantages during hot weather concreting. Retarding admixtures and cold weather tend to slow set times for slag cement concretes.

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Slag cement strength

Slag cement increases the compressive and flexural strength of conventional concrete (Figures 1 and 2) and is often a vital component in producing high strength concrete. 28-day strengths generally increase as the percentage of slag cement increases, up to about50 percent slag cement as a percent of cementitious material.

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Table 1 Setting Time of Concrete at Various Temperature

Use of Admixture and Its Effects on Setting Time. Initial set, as defined by ACI 116R, is a degree of stiffening of a mixture of cement less than final set, generally stated as an empirical value indicating the time in hours and minutes required for the cement paste to stiffen sufficiently to resist to an established degree, the penetration of a weighted test needle.

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Ground Granulated Blast Furnace Slag (GGBS) Chemical

May 09, 2018· Due to this property it imparts lower early age strength in concrete. Other properties of Ground Granulated Blast Furnace Slag concrete are as follows: Setting time. The setting time of concrete is mainly influenced by the temperature and water cement ratio. Using of GGBS in concrete generally increase the setting time slightly up to 30 minutes

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Setting Time of Cement Concrete Stages and Processes

Final Setting Time is defined as the period elapsing between the time when water is added to cement and the time at which the needle of 1 mm square section with 5 mm diameter attachment makes an impression on the test block . 600 minutes is the maximum time specified for the final set for all the above mentioned Portland cements.

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Slag set time in cold weather Structural engineering

Dec 13, 2007· Can someone tell me how much slag affects the set time of concrete? I asked for 15%-25% slag replacement because Type II cement is not readily available in the area. This is for a digester tank containing wastewater. But the concrete supplier does not want to use slag because it is harder to obtain than flyash and he said the outside

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Properties of Hardened Concrete with Blast Furnace Slag

At 7 days and beyond, the flexural strength of slag concrete is equal or exceeds controlled concrete flexural strength. The larger flexural strength of blast furnace slag concrete is the result of the stronger bond which is achieved in cement-slag-aggregate system due to slag particle shape and surface texture. Figure-4 shows slag particles.

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Slag in the mix design Concrete Engineering general

Aug 16, 2007· Advantages: you can increase the percentages in the warm/hot climatic conditions, slag will retard or slow the set of the cement paste, but if the concrete temps are in the 80's, you will have not problem with the set-times. The contractors will love it. Slag works great with HRWR's, both Mid Range and High Range.

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8 FACTORS AFFECTING SETTING & HARDENING OF CEMENT

Sep 22, 2016· Generally speaking, if mixed materials are added into the cement clinker, the anti-erosion will increase, and the heat of hydration and the early strength will decrease. (2) The Mixing Amount of Gypsum. Gypsum is called the retarding agent of cement which is mainly used for regulating the setting time of cement and is an indispensable component.

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Initial and Final Setting time of Cement Effects How

Oct 06, 2017· Within this time cement continues with reacting water and slowly cement starts losing its plasticity and set harden. This complete cycle is called Setting time of cement. Initial Setting time of Cement:-The time to which cement can be moulded in any desired shape without losing it strength is called Initial setting time of cement. Or

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Blast Furnace Slag Cement an overview ScienceDirect Topics

Pozzolana cement and blast-furnace slag cement have many common grounds in performance (see Table 4.6), such slow hydration, setting and hardening process, low early strength, high growth of the later strength, low heat of hydration, high corrosion, poor frost-resistance, and easy carbonization. The water demand of pozzolana cement is large.

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Slag Concrete an overview ScienceDirect Topics

12.3.1.1 Disruption model for steel slag aggregate concrete. Consider the disruption of two different concretes: an ordinary concrete that has undergone external loading and a steel slag concrete that may fail due to a steel slag particle expansion. For ordinary aggregate concrete, due to an external force acting, the strength of concrete

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GGBS Concrete CSMA The Cementitious Slag Makers

With GGBS, the setting time will be extended slightly, perhaps by about 30 minutes. The effect will be more pronounced at high levels of GGBS and/or low temperatures. An extended setting time is advantageous in that the concrete will remain workable longer and there will be a reduced risk of cold joints. This is particularly useful in warm weather.

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(PDF) Setting of Alkali-Activated Slag Cement. Influence

The objective of this work was to determine the mechanisms that govern the setting times of alkali-activated slag (AAS) cement pastes, as a function of the nature of the alkaline activator used.

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