The influence of slag properties, mix parameters and curing temperature
The fineness of slag has little effect on the strength/hydration relationship and no great benefit to strength or hydration is achieved by grinding the slag finer than around 310 m2/kg, for a slag cement paste cured at 40 °C.
Hydration of slag-blended cements
In this paper, the hydration of slag in blended cements is investigated through the measurement of hydration reaction indicators such as portlandite content, non-evaporable and …
The hydration of slag, part 1: reaction models for alkali-activated
Reaction models are proposed to quantify the hydration products and to determine the composition of C–S–H from alkali-activated slags (AAS). Products of the slag hydration are first summarized from observations in literature. The main hydration products include C–S–H, hydrotalcite, hydrogarnet, AFm phases (C4AH13 and C2ASH8) and ettringite. Then, three …
Influence of mineral admixtures on strength and hydration …
The paper delineates the effect of mineral admixtures on the strength and hydration products of lime-activated slag cement. The slag cement was prepared by activating ground granulated blast-furnace slag with lime and plaster of Paris. The compressive strength of mortar specimens made with admixtures such as silica fume, fly ash, glass powder and ordinary …
Influence of brine on hydration reaction of calcium …
Table 1 shows the components of the slag and CSA used herein through the XRF analysis. Table 2 shows the mineral composition of type-K CSA expansive agent. The components of brine are shown in Table 3 through ICP-OES. The CSA is a type-K expansive cement material in the classification of ACI 223R–10 [60].From previous studies using the …
Insights into the role of slag fineness on the hydration of slag
However, the influence of slag fineness on the hydration of G·SAC remains unclear. To this end, this study aims to reveal the impact of slag fineness on the hydration of G·SAC, from aspects of hydration heat evolution, hydrate formation, pore structure, and mechanical properties. ... The properties of slag cement and its influence on the ...
Hydration and mechanical properties of cement-steel slag …
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 …
Hydration and Properties of Magnesium …
Magnesium potassium phosphate cement (MKPC) is an excellent rapid repair material for concrete, and many mineral admixtures have been applied to promote its performance. This study focuses on the quantitative …
Modeling the Influence of Ground‐Granulated Blast Furnace …
Understanding the effect of slag substitution on the hydration of cement is still challenging; hence, this research is aimed at predicting the hydration of slag-incorporating …
The Influence of Temperature on the Hydration Rate of …
The review of existing studies has shown different ways to describe the influence of curing temperature on the hydration rate of cement and corresponding strength development [12,13,14,15,16,17]. A.G. Saul [ 18 ] has proposed a time-temperature factor (TTF), also known as a maturity index, as a way to express the development of concrete's ...
(PDF) Influence of Steel Slag on Properties of Cement
This literature review found that steel slag increases the fluidity of cement-based materials, with a setting time approximately 210% to 300% longer than that of Portland cement (PC).
Influence of limestone on the hydration of ternary slag cements
The hydration kinetics, microstructure and pore solution composition of ternary slag-limestone cement have been investigated. Commercial CEM I 52.5 R was blended with slag and limestone; maintaining a clinker to SCM ratio of 50:50 with up to 20% slag replaced by limestone. The sulphate content was maintained at 3% in all composite systems.Hydration was followed …
Hydration and Properties of Slag Cement Activated by …
The reaction kinetics are also studied by examining the hydration products of slag-blended cement paste through the technologies of X-ray diffraction (XRD), scanning electron microscopy (SEM), and nuclear magnetic resonance spectroscopy (NMR). ... Those experimental results provide detailed insights into the understanding of how the activators ...
Influence law and control mechanism of manufactured sand …
The utilization of tunnel slag processed manufactured sand for high-performance concrete preparation and its application in engineering construction can yield significant economic and social benefits. However, most studies in the field of hydration have predominantly focused on the stone powder, and completely disregarded the influence of sand particles on hydration.
Influence of wet grinded slag on the hydration of phosphogypsum-slag
The impact of C-S-H seeding on the hydration of slag blended cement was systematically investigated, trying to understand and explore the potential of C-S-H seeding in blended cement.
Influence of curing temperature on the process of hydration …
In this paper, the influence of temperature on the process of hydration of supersulfated slag cements was studied. Two methods of curing were used: Initial Curing Regime 1 (24 h at 23 °C followed by 6 days at either 13, 23, 38 or 50 °C) and Initial Curing Regime 2 (placed immediately after casting at 13, 23, 38 and 50 °C for 7 days) for both ...
The Influence of Slag on the Hydration of Cement
Factors influence the reaction degree of slag in slag blended cement; Low reactivity and reported reaction extent of limestone in blended cement; Physical effects of limestone on the hydration of cement clinkers; Review of several existing models simulating the hydration of cementitious materials; Hydration products of slag in blended cement
Modeling the Influence of Ground‐Granulated Blast Furnace Slag …
The possible influence of slag on the hydration of cement is higher when a lower w/c of about 0.3 is used in the mixture in the later ages as the replacement level of slag increases. The increase in w/c ratio to about 0.6 can accelerate the early hydration of slag-blended cement systems but it has a negligible effect in the later ages as the ...
The Influence of the Acceleration Admixture Type and …
Prospective research is a detailed study on the amounts of C-S-H phase and portlandite to determine the hydration rate. Keywords: cement, slag blended cement, accelerating admixtures, concrete, hydration heat, initial setting time, ... The influence of slag on the heat of hydration is described by many authors [19,20,21]. These sources indicate ...
Utilization of ladle furnace slag as cement partial …
Ladle furnace slag (LFS) is a potential new resource for the preparation of cementitious materials with early hydration activities. To evaluate the application performance of LFS as a supplementary cementitious material, the effects of LFS on the hydration and hardening performance of cement were studied from the aspects of the hydration process, the physical …
Influence of steel slag fineness on the hydration of cement-steel slag
Steel slag has the potential to be used as a mineral admixture, but its wide utilization is restricted by the low activity. Grinding may increase the slag's hydration activity. However, little is known about the role of superfine steel slag in the composite cement paste. In this work, the hydration, microstructure, and macroscopic performances of the samples containing ground …
Influence of fineness on the cementitious properties of steel slag
Hydration heat of steel slag. Figure 2 shows the exothermic rates during the hydration of the three steel slags with different finenesses. The exothermic process of steel slag is very similar to that of cement which can be divided into five stages: (1) short rapid exothermic stage at which the first exothermic peak forms; (2) dormant period at which the exothermic rate …
The influence of slag properties, mix parameters and curing temperature
The results suggest that slag and blend reactivity is clearly influenced by the level of replacement in the system; at low slag levels the hydration of the system is reduced, resulting in a significant drop in strength, however at higher slag to Portland cement ratios, slag seems to be more effectively activated resulting in increased strength ...
Study on the hydration characteristics of steel slag cement
In this study, the hydration characteristics of stainless steel slag cement (SS) and ordinary Portland cement (OPC) were compared and analyzed using isothermal calorimetry, X …
Influence of slag chemistry on the hydration of alkali-activated blast
Influence of the Al 2 O 3 content of the slag on the hydration kinetics using NaOH (a) at early ages (internal mixing), (b) up to 5 days (external mixing), using WG (c) at early ages (internal mixing) and (d) up to 5 days (external mixing). Download: Download full-size image; Fig. 4.
Influence mechanism of autoclaved aerated concrete waste …
The influence of WAP on the hydration process and products of the pastes was examined using XRD testing. ... In this study, the incorporation of WAP influenced the hydration process of slag-cement blends. The results indicated that the leachable sulfate in WAP significantly impacted early hydration. Furthermore, the incorporation of WAP ...
Influence of steel slag fineness on the hydration of cement-steel slag
The wet-grinding specimens presented a higher hydration heat than that of raw steel slag specimens, and the microstructure of 3 μm-40% (3 μm steel slag mixed with cement as a dosage of 40%) is ...
Influence of slag on water resistance of magnesium silicon …
This paper primarily investigated the influence of slag content on the hydration reaction of S-MSPPC, with a focus on the microstructure and water resistance mechanism. ... Investigation of magnesium phosphate cement hydration in diluted suspension and its retardation by boric acid. Cement Concr. Res., 87 (2016), pp. 77-86, 10.1016/j.cemconres ...
The Influence of the Acceleration Admixture Type and …
The Influence of the Acceleration Admixture Type and Composition of Cement on Hydration Heat and Setting Time of Slag Blended Cement. April 2022; Materials 15(8) ...
Influence of fineness on the cementitious properties of steel …
Replacing part of cement by steel slag with high Al 2 O 3 content might accelerate the initial hydration of cement, resulting in a shorter setting time and greater loss in fluidity [12]. …