Chemical and physical effects of high-volume limestone …
The hydration of Portland cement blended with iron-rich sewage sludge ash (IRSSA) was investigated. The addition of IRSSA results in a retarding effect on cement clinker hydration during early ages, especially C 3 S, while the reaction degree of cement clinker increases at later ages. The second peak observed in the deceleration period of heat ...
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Effects of Intergrinding 12% Limestone with …
Cement properties, including chemical and physical properties and mortar properties, such as compressive strength, drying shrinkage, and sulfate expansion were investigated comprehensively for...
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Impact of limestone fineness on cement hydration at early …
In addition to the chemical effect, limestone acts as filler in cementitious systems [1].As such, limestone enhances cement hydration by providing nucleation sites for C-S-H [10].Moreover, the presence of limestone particles increases the shearing rate during mixing because of the decrease of the distance between particles [10, 11].The nucleation sites and the …
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Effect of High Content Limestone Powder on …
558 Vol.38 No.3 C engmeng et al: Effect of High Content Limestone Powder on Micro... hydrates and an increase in compressive strength [22]. G Puerta-Falla et al found that MK increases the reactivity of limestone and enhances the formation of carboaluminate in the hydration products[23]. However, at present, the amount of LP used in
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Effects of Alternate Wet and Dry Conditions on the …
Abstract. Sulfate attack in concrete structures significantly reduces their durability. This article reports the experimental findings on the effects of sodium sulfate on limestone calcined clay cement (LC 3) in an alternate wet and dry media.The samples underwent wet–dry conditions of 28 cycles.
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Portland-Limestone Cement
Effects on fresh concrete. Workability. In general, the fineness of the limestone is the main factor that influences workability. ... The data shown in Table 1 indicate that the limestone content of cement can be increased from the level typically used in conventional portland cement (about 3.5%) to 15% while maintaining equivalent performance ...
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Effectiveness of Limestone Powder as a Partial Replacement of Cement …
The objective of this study is to investigate the performance of normal- and high-strength concretes including limestone powder (LP) through their mechanical properties. Moreover, sustainable flat plates made of these concretes were investigated through their punching strength. For this purpose, two different types of concrete (normal- and high-strength) …
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Cement with high-volume limestone powder: effect of …
The effects of limestone powder (LP) of different fineness on the packing density, strength and hydration behaviour of cement blended with a high volume of LP were studied using Vicat setting time tests, strength tests, isothermal calorimetry and scanning electron microscopy.
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The effects of limestone aggregate on concrete properties
Some of these benefits include good strength, low possibility of alkali-silica reaction and the decrease in drying shrinkage in concrete. This research discusses the consumption …
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Effect of cement substitution by limestone on the hydration …
The effect of limestone on the hydration and microstructural development of ultra high performance concrete (UHPC) with different levels of replacement (34%, 54% and 74% by volume) was investigated. Up to 54% replacement of cement by limestone the mixes showed better workability and higher compressive strength (170 MPa at 56 days for 54% ...
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Recent Developments on the Effects of Micro- and Nano …
It has physical effects (nucleation effect and dilution effect) and chemical effects on the hydration process of cement. This paper reviews the effects of three representative limestone materials on the hydration process, hydration products, and hydration kinetics.
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A review on effects of limestone powder on the properties of concrete
Effects of LS from different sources on the workability of concrete were compared in [31].From Fig. 3, it can be seen that limestone from quarry waste (QLS) reduced the spread flow values of concrete, but those produced by direct grinding (PLS) increased the flow values of concrete which were mainly attributed to the surface morphology and fineness of the particles.
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Influence of Limestone Powder as Partial Replacement of Cement …
This paper summarize and discuss the effect of the limestone powder (CaCO 3) as a compensating material with cement on the compressive and tensile strength and discuss the effect of elevated ...
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Limestone particle sizes and sulfate impact on the early …
This study explores the underlying mechanisms behind the varying grain size distribution of limestone and sulfate requirement in Limestone Calcined Clay Cements (LC 3) on the effects of early hydration and rheological properties.In this paper, the experimental study involving a 45 % replacement of cement demonstrates that the filler effect increases with the …
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Limestone addition effects on concrete porosity
The main aim of this study is to assess the effect of limestone use as cement component on the porosity, (including water absorption and sorpitivity) of cementitious mixtures (such as cement paste, mortar and concrete) and establish how this may be used in practice. ... Increased Limestone Mineral Addition in Cement the Affect on Chloride Ion ...
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Synergistic Effects of SAP, Limestone Powder and White Cement …
These findings underscore the efficacy of limestone powder in augmenting the durability of SAP-integrated white fair-faced concrete. Intriguingly, an increase in limestone powder content correlates with enhanced durability of the fair-faced concrete. The underlying mechanism can be attributed to the micro-aggregate filling effect of limestone ...
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The effects of limestone aggregate on concrete properties
The ratio of limestone as aggregate in the concrete in 1974 was only 1.3%. Since then, the shipments and the usage of limestone have increased every year with the demand of concrete and the shortage of other natural aggregates as illustrated in Fig. 2. The ratio of limestone as aggregate exceeded 8% in 2003.
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Performance improvement of Portland-limestone cement …
At low replacement, the limestone powder not only can enhance the hydration of clinker by the so-called filler effect but also reacts with C 3 A in cement, producing hemicarbonate (Hc) and monocarbonate (Mc), contributing to compressive strength [4].Since the permissible limestone contents, which do not decrease compressive strength, depend on the amount of …
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Effects of limestone replacement ratio on the sulfate …
A comparative study has been performed on the sulfate resistance of Portland limestone cement (PLC) mortars exposed to extraordinary high sulfate concentrations (200 g/l).PLCs have been prepared by using two types of clinkers having different C 3 S/C 2 S ratios and interstitial phase morphologies. Blended cements have been prepared by replacing 5%, …
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The influence of the higher limestone content of General …
It is recommended that the allowable limestone content of GP cement be increased from 7.5 to 12%, resulting in an estimated 6% reduction in CO2eq emissions associated with cement …
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ANALYSIS OF THE EFFECT OF VARIOUS TYPES OF …
that both tensile and compressive strength decreases with the increase of the limestone content in cement. Limestone can worsen or improve workability, depending on distribution of limestone …
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Effect of Cement Type and Limestone Powder Content on
All mixtures contain paste with cement, silica fume and a water/binder ratio of 0.38 by mass. The concrete composition consists of 47 vol.% paste and 53 vol.% aggregates. The replacement of the cement by limestone powder and the amount of PCE was adapted according to the investigations.
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Effect of Calcium Nitrate on the Properties of Portland–Limestone …
The effect of calcium nitrate (CN) dosages from 0 to 3% (of cement mass) on the properties of fresh cement paste rheology and hardening processes and on the strength of hardened concrete with two types of limestone-blended composite cements (CEM II A-LL 42.5 R and 42.5 N) at different initial (two-day) curing temperatures (−10 °C to +20 °C) is presented.
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Evaluation of the Efficiency of Limestone Powder in Concrete and …
The results indicate that the efficiency of limestone powder in partially replacing cement can be achieved by particle packing and particle distribution in the concrete and the benefits of ...
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Effect of limestone waste on the hydration and …
During the hydration process, the net reaction heat of limestone waste in the cement blends ranged from 0.38 J/g to 4.1 J/g. In addition, the thermodynamic modeling and XRD indicated that the monocarbonate and hemicarbonate were stable in the limestone-cement blends, and the limestone waste increased the stability of ettringite.
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A fresh perspective on effect of metakaolin and limestone …
Certain negative effects had also emerged during the growth. The price of cement increased by 20% in 2016 compared with that in 2010 [2]. Moreover, from an environmental consideration, the production of cement was the main contributor to the global CO 2-emissions (65% of the total key greenhouse gases) [3]. Therefore, the high cost of the ...
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Analysis of the Effect of Various Types of Limestone as a …
Obtained results indicate that both tensile and compressive strength decreases with the increase of the limestone content in cement. Limestone can worsen or improve workability, depending on ...
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Effect of limestone powder on the properties of alkali …
Limestone (LS) is a sedimentary rock, which occupies around 15 % of the crust of the earth [1], [2]. The LS is the almost common pattern of CaCO 3 which is used widely for cement manufacture. Part of CaCO 3 may turn into dolomite by replacement with MgCO 3 at levels up to 46 %. In spite of most of the available limestones are pure, they contain less than 5 % …
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Long-term properties of concrete containing limestone powder …
However, it was reported that high-volume limestone powder concrete exhibited lower resistance to carbonation than high-volume fly ash concrete . Negative effect of limestone powder on the resistance to carbonation of concrete was also observed with the replacement ratio exceeding 10–15% .
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Effect of limestone powder addition on corrosion initiation …
Limestone powder (LP) has been widely used as a cement alternative in concrete formulation owing to its low cost and environmental benefit [1]. By acting as a physical filler between cement grains, LP contributes to a more preferable particle packing with increased packing density, thus making the concrete matrix more compact [2].
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