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The cement paste with UFS showed adverse effects on the rheological behaviour. The yield stress ( τ 0 ) and the plastic viscosity ( η p ) increased with the rising dosage of UFS. Under the period of steady-state shearing (1800 s), the initial shear stress ( τ i ) and minimum shear stress ( τ min ) increased consistently as the UFS content ...
Results show that fly ash (164 kg CO 2 eq, 54% reduction) and GGBS (141 kg CO 2 eq, 61% reduction) reduce the global warming potential of pure-cement concrete (357 kg CO 2 eq) without considering SCM transportation.
The phosphorus slag (PS) can be used as a supplementary cementitious material due to its potential hydrating activity. However, its usage has been limited by its adverse effects, including prolonged setting and lowered early-stage strength. In this study, we achieved ultrafine granulation of PS using wetmilling (reducing d50 to as low as 2.02 μm) in order to increase its …
Replace 35%–50% of the cement with slag cement. Up to 70% of the cement may be replaced when concrete is used for mass concrete placements. 4.2.6.3. Option 3. Replace 35%–50% of the cement with a combination of coal ash, slag cement, MFA, natural pozzolan, or at least 3% silica fume; however, no more than 10% may be silica fume. Up to 70% ...
The application of steel slag aggregate (SSA) as aggregate in concrete can have adverse effects on the workability, volume stability and residual strength after high-temperature exposure. However, these adverse effects can be mitigated or even eliminated by employing superplasticizer, proper aging processes and pre-heating treatments.
Slag Cement Safety Data Sheet According To Federal Register / Vol. 77, No. 58 / Monday, March 26, 2012 / Rules And Regulations Revision Date: 08/09/2018 Date of Issue: 09/11/2012 Version: 2.0 08/09/2018 EN (English US) 1/7 SECTION 1: IDENTIFICATION 1.1. Product Identifier Product Form: Mixture
Partially replacing slag with VGP shows an adverse effect on the flowability, of which the higher the VGP ratio is, the lower the flowability is. Introducing only 10% VGP (V10) into the mixture results in a reduction in the flowability by 23.81%. ... It is worth mentioning that the introduction of VGP into traditional cement concrete mixture ...
This study aims to improve the mechanical properties of cement-steel slag mortar by the addition of alkaline activators (NaOH, Na 2 CO 3 /NaOH and water glass) to promote the optimal utilization of steel slag. In this paper, the setting time, flexural and compressive strength, early-age hydration kinetics and microstructure are investigated to explore how the alkaline …
The compressive strength of 5 μm-20% and 3 μm-20% are still higher than that of cement. When steel slag dosage comes to 30%, only 3 μm-30% has a close compressive strength with cement. The raw steel slag could replace cement with only 10% dosage without adverse effect on the mechanical property.
To reduce the adverse effects of slag and the consumption of natural sand and macadam, Liu et al. [15] prepared a cement-stabilized ... The results showed that 20% slag and 4% cement meet the ...
This paper summarizes and analyzes the relevant research on steel slag powder (SSP) as a cementitious material, studies the effect of SSP replaces cement as single or multiple admixtures, with different specific …
At lower water-binder ratios, however, the adverse effects of steel slag on the strength of compression, penetrability, and the carbonation resistance of concrete were less pronounced. When the W/B was high early in the drying process, steel slag accelerated shrinkage, but it had no impact on the final shrinkage at 90 days.
The addition of steel slag promoted the cement hydration, while lithium slag inhibited the cement hydration, from the XRD peak intensity of porlandite of S10 and L10. ... further replacement of OPC by SS had an adverse effect and mechanical properties were considerably declined. Under standard curing, L10S10 had compressive strength of 48.2 MPa ...
This study develops an innovative wet carbonation process utilizing Magnesium Slag(MS), Salt Lake Bischofite (SLB), and CO 2 to prepare carbonized materials mainly composed of aragonite and active silica gel, all raw materials were solid wastes. Subsequently, it was employed as Supplementary Cementitious Materials (SCMs) additive in cement, with the …
In this review, steel slag usage in the cement and concrete industry and its environmental effects were examined. Also, its physical and chemical structure, its effect on the …
The analysis results indicate that the incorporation of steel slag powder (SSP3) may have adverse effects on the initial setting time, volume stability, compressive …
Sample GS has the highest increased percentage exceeding 20%, which is attributed to the chemical effects of steel slag. In the ternary composite cementitious system, the hydration of cement and steel slag produces Ca(OH) 2 and C-S-H gel, and then the pozzolanic reaction of GBFS occurs for Ca(OH) 2 and produces more gel.
Interestingly, this approach does not have any adverse effects on the mechanical properties, durability, and microstructure of the specimens [36], [39]. ... To further investigate the effect of DEC on the hydration of cement-slag composite cementitious materials with different SS dosage, the calculated chemically bound water and Ca ...
The hydraulic and related properties of Portland-slag cement containing granulated blast furnace slag as high as 40% (w/w) has been examined at room temperature under the mixed activation of ...
1. Introduction. In order to decrease the environmental impact of concrete within an environmentally sustainable design and reduce CO 2 emissions due to its production, Ground Granulated Blast-furnace Slag (GGBS), a glassy by-product of pig iron and steel manufacturing, is commonly used to produce blast-furnace slag cements and GGBS-concrete mixtures [1].
CO 2-mixing by directly injecting CO 2 into fresh cement-based materials is a burgeoning technology to produce low-carbon cement products. The objective of this study is to investigate the influence of the calcium carbide slag (CCS) content on the properties and carbon sequestration efficiency of cement pastes mixed under direct CO 2 injection conditions.
However, due to the significant deteriorative effect of SAC on cement strength, it was not feasible to improve the adverse effects of excessive GGBS using this method. (3) ... Properties of composite cement-sodium silicate grout mixed with sulphoaluminate cement and slag powder in flowing water. Constr. Build. Mater., 308 (2021), Article 125040.
Copper slag used in this work was brought from Oman Mining Company, which produces an annual average of 60,000 tons. In preparation of cement mortars, the sand and copper slag particles used were those passing 850 μm and retained on 600 μm according to OS26-1981 [14].The copper slag was ground in the laboratory into a fine powder to the …
An adverse effect is noticed when the PVA fiber volume fraction exceeds 0.3% volume fraction. (2) ... Investigation of engineering properties of normal and high strength fly ash based geopolymer and alkali-activated slag concrete compared to ordinary Portland cement concrete. Construct. Build.
Jin et al. [14] studied the sulfate resistance of alkali-activated slag concrete and found that the hydration product magnesium aluminum hydroxide is the key to its good durability in sulfate environment. ... Nonetheless, seawater erosion also has adverse effects on concrete, and these factors interact, resulting in complex and variable changes ...
CO 2 -mixing and steel slag synergistically improve early strength of concrete. Increasing steel slag content alleviates adverse effects of high CO 2 dosage. CO 2 -mixing …
According to the composition test results, the active component of steel slag is less than that of cement. So, the concrete strength with steel slag develops slowly. In addition, Wang [37] showed the influence of steel slag on the hydration of cement during the hydration process of complex binder. It was found that steel slag and cement affect ...
This paper presents an experimental study to investigate the effect of lithium slag (LS) on the durability properties of concrete. The lithium refinery residue known as LS is an industrial by-product that is produced during the production of lithium carbonate which may have serious adverse effects onthe environment.
This report addresses the use of slag cement as a separate cementi-tious material added along with portland cement in the production of concrete. This report does not address slags derived …
adverse effects of early age expansions giving no long-term expansions in any of the mixtures containing the extender. Keywords. Sulphate resistance, mortar expansion, initial compressive strength, ... resistance irrespective of the composition of slag or cement while low Al 2O 3 content of slag should ensure improved sulphate resistance in ...
White cement manufacturing process. White cement is a type of special cement, belongs to decoration cement.In general, Portland cement is greyish-green, as the name suggested, white cement is white. In the cement …
Alkali-activated slag (AAS) has the potential to be applied in winter construction due to its continuous hydration at subzero temperature. However, to further enhance the mechanical properties of AAS as structure repair material in cold regions, calcium oxide (CaO) at proportions of 1 wt%, 2 wt%, 3 wt% and 4 wt% were incorporated as partial replacement of …
1. Introduction. Magnesium slag (MS) represents a residual by-product derived from the silicothermic reduction process utilized in the production of magnesium metal [1].The Pidgeon method, a widely employed technique for magnesium manufacturing, results in the generation of approximately 5–10 tons of MS per ton of magnesium metal [2].In China, a …
Moreover, various techniques were adopted to overcome the adverse effect of RA on geopolymeric concrete and to further enhance the performance of geopolymeric RAC [23, 31].Among them, the incorporation of calcium-carrying materials such as OPC and slag into geopolymer RAC has been demonstrated as an effective method.
Towards this goal, the article investigates the roles of ground granulated blast furnace slag (BFS) and copper slag (CS) content, in addition to hooked-end steel fiber length, on the electrical properties of eco-friendly ultra-high performance hybrid fiber-reinforced self-compacting concrete (HFR-SCC) for the first time in the literature.
The substitution of more than 5% copper slag for portland cement does not seem to have a beneficial effect on concrete properties. This confirms a previous study [15] on the use of CBPD in concrete, where low CBPD contents (<5%) at 1ow water-to-binder ratios did not have an appreciable adverse effect on concrete strength. Higher CBPD ...
The results indicated that the addition of various types of SF extended the setting time of AASG pastes; however, excessive amounts of SF increased the volume of capillary pores, leading to adverse effects. Tam et al investigated the effects of fly ash and blast furnace slag on recycled concrete. The findings revealed that replacing 50% of ...
This work experimentally investigated the effects of curing temperatures (7, 15, 20 and 30 °C) on the setting time, strength development, shrinkage, and microstructure of alkali activated slag (AAS).The results indicated that the impact of the curing temperature was much more significant on the setting time of AAS than on that of ordinary Portland cement (OPC), …