The hydration, strength development and composition of hydration products of supersulphated cements were characterized from the first 48 hours up to 360 days. Two compositions of 80% Blast furnace slag, 10–15% Fluorgypsum and 10–5% Portland cement were cured in dry and wet conditions. The main hydration products …
WhatsApp: +86 1822175507351 [16, 17], understanding the reaction mechanisms of composite cement containing slag 52 and limestone is of high importance. 53 The impact of calcium carbonate on the hydration of ternary slag-limestone cement is 54 the focus of the present study. A multi-technique approach was applied to study 55 hydration.
WhatsApp: +86 18221755073Therefore, since demand for these cement is growing [16], [17], understanding the reaction mechanisms of composite cement containing slag and limestone is of high importance. The impact of calcium carbonate on the hydration of ternary slag-limestone cement is the focus of the present study. A multi-technique …
WhatsApp: +86 18221755073In the example of Fig. 1, after 28 h the heat evolution of the blend with slag is noticeably higher than that of the blend with quartz — this indicates the start of the reaction of the slag. Recent progress in understanding the impact of SCMs on hydration is discussed later, was reviewed in [5] and also forms part of another article in this volume [6].
WhatsApp: +86 18221755073The plot shows that the use of slag with a lower specific surface area resulted in a slightly shorter induction period, a slightly higher maximum hydration heat …
WhatsApp: +86 18221755073The chemical composition of the slag had a large influence on the amount of the hydrates formed and thus on the volume of the hydrated slag. ... (SSC) consist of 80–85 wt.% of slag with 10–15 wt.% of anhydrite and an alkaline activator, often Portland cement clinker [2]. The main hydration products are ettringite and C–S–H [3], [4]. SSC ...
WhatsApp: +86 18221755073In this study, the fresh state and hydration properties of 0–60% lithium slag blended cement pastes were investigated at water-binder ratio of 0.47. The workability of the fresh pastes was evaluated by measuring the air content, marsh cone flow, mini-slump flow, setting times, and through rheology tests. A 40% lithium slag cement could …
WhatsApp: +86 18221755073The 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 ...
WhatsApp: +86 18221755073The 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 ...
WhatsApp: +86 18221755073However, few studies focused on the very early-age hydration of cement-steel slag composite binder. Although it has been widely reported that the hydration of cement-steel slag composite binder is significantly slower than that of plain cement [[17], [18], [19], 33], this knowledge is merely based on the isothermal calorimetry or the …
WhatsApp: +86 18221755073These become more vivid as hydration progresses. Hydration of blast-furnace slag produces a higher amount of calcium silicate hydrate (C–S–H) gel and a lower amount of C–H than normal concrete at any given hydration age [1]. New hydration products of slag are formed during the hydration of BFS/Portland cement (PC) …
WhatsApp: +86 18221755073The results illustrate that UGCS has influence on the hydration heat evolution of blended cement due to its filler effect and pozzolanic reaction. The …
WhatsApp: +86 18221755073To improve the utilization of steel slag as a mineral admixture, the function of steel slag with different fineness in composite paste is necessary to be explored. This …
WhatsApp: +86 18221755073Influences of carbonated steel slag on concrete properties5.1. Microscopic pore structure. The carbonated steel slag concrete usually forms a dense interface microstructure [176]. Furthermore, the hydration products of Portland cement, free magnesium oxide, and calcium oxide in the concrete can also undergo carbonation, …
WhatsApp: +86 18221755073Semantic Scholar extracted view of "A conduction calorimetric study of gasifier slag-portland cement blends" by C. Bland et al. ... The influence of different additions on portland cement hydration heat ... 2000; The effect of temperature, in the range 10–60°C, on the early hydration of two Portland cements from Mexico and three …
WhatsApp: +86 18221755073The use of geopolymer as a cementitious material for geopolymer concrete (GPC) is beneficial for the sustainable development and green transformation of the …
WhatsApp: +86 18221755073According to the results above, it is found that FA will hinder the hydration of cement at early age under 20℃ but will benefit the early hydration of cement under 60℃ (as shown in Fig. 4), which is similar to the findings from Han [3]. In contrast, SL will benefit the early age hydration of cement at both 20℃ and 60℃.
WhatsApp: +86 18221755073DOI: 10.1680/ADCR.2003.15.3.129 Corpus ID: 96777573; Effect of activator mix on the hydration and strength behaviour of alkali-activated slag cements @article{FernndezJimnez2003EffectOA, title={Effect of activator mix on the hydration and strength behaviour of alkali-activated slag cements}, author={Ana Fern{'a}ndez …
WhatsApp: +86 18221755073The hydration process of slag blended cement is still under investigation due to the complex interactions between clinker and slag. The aim of this work is to link the …
WhatsApp: +86 18221755073The mix procedure applied for all mixtures complied with GB/T 17671-1999 [41].The clinker and gypsum were mixed with ratio of 95:5 to be pure cement, and ground to the fineness of (350 ± 10) m 2 /kg. The specific gravity of cement was 3.16 m 2 /g. The specific gravity of slag was 2.87 m 2 /g. The purity grade of gypsum was 87.2%.
WhatsApp: +86 18221755073Silico-manganese (SiMn) slag is a byproduct of SiMn alloy production process, which has been blended with a clinker to produce Portland slag cement. The influence of mechanical activation (in vibratory mill) on the heat of hydration, physical properties, and structural changes is elucidated and compared with a ball-milled control …
WhatsApp: +86 18221755073Finally, the beneficial effects of using slag waste in concrete were quantified by determining associated CO 2 emissions. It is concluded that slag incorporation in concrete significantly reduces the CO 2 emissions, (up to 68%) depending on the cement replacement level, thus promoting green construction and sustainable development.
WhatsApp: +86 18221755073The 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. For this purpose three different activators were used: waterglass (Na2SiO2.nHaOH with a SiO2/NaO ratio equal 1·5), NaOH and Na2CO3. The …
WhatsApp: +86 18221755073The 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 …
WhatsApp: +86 18221755073The precursor material in AAS cement is a ground granulated blast furnace slag (GGBFS). The density and specific surface area of GGBFS are 2.87 g/cm 3 and 432 m 2 /kg respectively. The main chemical composition is shown in Table 1.The basicity coefficient (M= (CaO + MgO) / (SiO 2 + Al 2 O 3)) is 1.05.According to the State …
WhatsApp: +86 18221755073The influences of different fineness lithium slag power as admixture on the cement water requirement, strength and adaptablity between admixture and cement of cementitious materials, and the ...
WhatsApp: +86 182217550731. Introduction. Blast furnace slag is a byproduct from pig iron production and it has been used as a mature addition in cement industry for several decades, especially in European and north American countries [1], [2], [3], [4].The chemical composition of slag varies depending on the origin significantly, such as where iron ore …
WhatsApp: +86 18221755073A retarding effect of the slag on the hydration of the cement phases was also observed. The R3 isothermal calorimetry reactivity test showed that the slag's reactivity was similar to that of siliceous fly ashes commonly used in concrete, and that increasing the fineness of the slag resulted in a more reactive material. ... Influence of slag ...
WhatsApp: +86 18221755073The hydration and the microstructure of three alkali activated slags (AAS) with MgO contents between 8 and 13 wt.% are investigated.The slags were hydrated in the presence of two different alkaline activators, NaOH and Na 2 SiO 3 ·5H 2 O (WG). Higher MgO content of the slag resulted in a faster reaction and higher compressive strengths …
WhatsApp: +86 18221755073The feasibility of sulphoaluminate cement (SAC) utilization in support mortar was studied. Setting time and strength of as-received sulphoaluminate cement (SAC) paste were examined, hydration kinetics behavior was determined through Isothermal Calorimeter, and hydration mechanism was investigated by X-Ray diffraction analysis …
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