A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of .... "/>
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Plastic shrinkage and drying shrinkage

Feb 06, 2020 · Plastic shrinkage cracking refers to the cracks formed when concrete has not yet set. It occurs when the concrete is in the form of plastic only. The main cause behind crack formation is the rapid drying process. Cracks can be seen the next day after the finishing operations. Plastic shrinkage cracks can form randomly or [].

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A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

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concrete is the combined effect of dry-ing shrinkage, plastic shrinkage, and the chemical shrinkage that accompa-nies hydration. The type of shrinkage that predominates depends on the mix, materials, and drying conditions. Chemical shrink-age begins as soon as the cement comes in contact with the water. Pure cement-and-water pastes have been shown.

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Drying shrinkage Plastic shrinkage is a result of early drying. The loss of pore water causes drying shrinkage, which is a long-term occurrence. At 50 percent RH, 500 microstrain is typical after 28 days.The loss of water from gel pores (produced in the gel during hydration) is more closely connected with drying shrinkage.

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Guidelines to Avoid Plastic Shrinkage Cracks. Protect the plaster from sun & wind to avoid drying too quickly, initiate plastering timing to avoid direct sunlight and strong wind on plastering surface. Saturate the masonry wall adequately with water before plastering. This will avoid the brick work from absorbing the water in plaster..

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This problem has been solved! Who are the experts? Experts are tested by Chegg as specialists in their subject area. We review their content and use your feedback to keep the quality high. (2) The main difference between plastic shrinkage and drying shrinkage are as follows : In plastic shrinkage the vo . View the full answer..

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Plastic shrinkage cracks form within the initial three hours of concrete casting although they are often not noticed until the following day. Plastic shrinkage cracks aren't directly affected by the reinforcement in the concrete. Plastic shrinkage cracking is basically a physical action, as the shrinkage of clayey soils under drying conditions.

What is the difference between plastic shrinkage and drying shrinkage of concrete? What preventive measures would you take to minimize/prevent cracking associated with plastic shrinkage?.

WHAT ARE PLASTIC SHRINKAGE CRACKS? Plastic shrinkage cracks are so-called because they form while the concrete is still plastic, ie has not set. Rapid drying of the surface of the plastic concrete causes it to shrink and crack, but the cracks are not always evident during finishing operations and may not be discovered until the next day.

A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

Drying shrinkage happens after the concrete is set. Plastic shrinkage is associated with bleeding, which is the appearance of moisture on the surface of concrete. This is usually caused by the settling of heavier components in a mixture. Bleed water typically evaporates slowly from the surface of concrete.

Plastic shrinkage and drying shrinkage (particularly when RH is greater. than 45%) is caused by the physical loss of water by evaporation or drying. Autogenous shrinkage is caused by the chemical loss of water due to the hydration reaction. However, the insight of the fundamental mechanism for these three shrinkages is essentially very similar..

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Plastic shrinkage cracks. Cracks caused by excessive drying from exposed surfaces Plastic shrinkage cracks can form in young concrete, within the first few hours after placing. At this time the concrete is plastic and has little strength. Water can move relatively freely and tends to move upwards towards the surface, a phenomenon known as bleeding.

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Physically, concrete that experiences a drying shrinkage of about 0.05 percent (500 millionths or 500 x 10-6) will shrink approximately 0.6 in. per 100 ft (50 mm for every 100 m). In more graphic terms, that is about two inches for the length of a football field. There are several factors that affect drying shrinkage. Is drying shrinkage.

The drying shrinkage consistently increased with the increase in the modulus of LSS. The oxyalkylene alcohol-based SRA could significantly reduce the autogenous and drying shrinkage of AAS mortars while the magnesia expensive agent was comparatively less effective. The autogenous shrinkage of AAS mortars was inversely proportional to the.

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Others are plastic shrinkage cracks and drying shrinkage cracks. By definition, plastic shrinkage cracking occurs while the concrete is still plastic and typically while the slab is still being finished. ... Control drying shrinkage cracks by properly placing joints in the slab—2 1/2 to 3 times in feet the thickness of the slab in inches (so.

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Jul 01, 2015 · Plastic shrinkage may lead to cracking that propagates easily due to the very low concrete strength and ultimately impair concrete performance and require expensive repairs. The risk of plastic shrinkage cracking increases with increased evaporation rates, i.e. for exposed surfaces at high wind speed, high temperature and low relative humidity ....

The drying shrinkage consistently increased with the increase in the modulus of LSS. The oxyalkylene alcohol-based SRA could significantly reduce the autogenous and drying shrinkage of AAS mortars while the magnesia expensive agent was comparatively less effective. The autogenous shrinkage of AAS mortars was inversely proportional to the.

Proper concrete curing can minimize plastic shrinkage cracking and dry shrinkage cracking. Curing Methods There are three curing methods recognized in the 2004 TxDOT Standard Specifications: 1. Form curing - Form curing allows the concrete to cure by preventing mix water evaporation. Because the concrete is in direct.

Add to media jar containing dry ingredients and mix well until dissolved.. Yeast extract 3.000 Malt extract 3.000 Dextrose (Glucose) 10.000 Agar 20.000 Final pH ( at 25 C) 6.2±0.2 **Formula adjusted, standardized to suit performance parameters Directions Suspend 20.5 grams in 490 ml purified/distilled water.

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Ubani Obinna. -. February 21, 2020. Autogenous shrinkage is caused by self-dessication in young concrete as water is consumed during hydration reaction. This occurs majorly within the early days of casting the concrete, while drying shrinkage is the reduction in volume caused mainly by the loss of water during the drying process and this.

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1)Plastic shrinkage. 2)Drying shrinkage. 3)Autogenous shrinkage. 4)Carbonation shrinkage. Now the types of shrinkage are explain as; a) plastic shrinkage :- Due to plastic shrinkage cracks will be appear on the surface of hardened concrete or fresh concrete when its placed on the surface horizontal. The plastic shrinkage occur mostly due to.

initial setting period of newly poured concrete in the plastic stage. Plastic shrinkage is directly proportional to the cement content and indirectly proportional to the water-cement ratio. Drying Shrinkage – The drying shrinkage is a continual process and happens in hardened cement concrete surfaces due to the evaporation of water molecules at the final setting time of concrete.

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Plastic shrinkage of common problems and solutions under 8 scorching, airlines Analysis of the causes: generally known as scorching (Burn Mark) includes the surface of the product due to plastic degradation resulting in discoloration and the filling end of the product scorched black phenomenon.

The Shrinkage limit, Plastic Limit and Liquid limit together form the Atterberg limits, important for the effect of water on clay or silt soils. The relationship between the three is that the shrinkage limit defines when dry soil becomes friable, the plastic limit is where the soil becomes malleable and the liquid limit where the soil becomes.

. Plastic-shrinkage cracking: Cracks that run to the mid-depth of the concrete , are distributed across the surface unevenly, and are usually short in length. Most often occurs while concrete is curing, due to the surface of the concrete drying too rapidly relative to the concrete below.

The Shrinkage limit, Plastic Limit and Liquid limit together form the Atterberg limits, important for the effect of water on clay or silt soils. The relationship between the three is that the shrinkage limit defines when dry soil becomes friable, the plastic limit is where the soil becomes malleable and the liquid limit where the soil becomes.

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TIP 17 - Drying Shrinkage of Concrete Drying shrinkage requirements are becoming more common in specifications for concrete. The typical specification clause: Length hange measured in accordance with ASTM 157: 500 microstrain (0.05%) at 28 days of drying. The specified limit of length change can be 400 microstrain (0.04%) or lower.

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Plastic shrinkage cracking (as shown below) is caused by rapid drying of the concrete surface. They can occur at any time of the year, from cooler low-humidity weather conditions to, in particular, hot weather conditions involving any one or a combination of high temperature, low humidity and wind. Plastic Shrinkage Cracking of Concrete.

Sep 09, 2021 · How to calculate inventory shrinkage Examples showing the effect of shrinkage Free Download for Newsletter Subscribers 73 for a result of 31 The use of a shrinkage-reducing admixture or a crack-reducing admixture will reduce the overall drying shrinkage, The use of a shrinkage-reducing admixture or a crack-reducing admixture.

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Marcin Stelmarczyk. Plastic shrinkage cracking in concrete is mainly a physical process, in which chemical reactions between cement and water do not play a decisive role. It is commonly believed.

It represents that strain caused by the loss of water from the hardened material Drying shrinkage and the viscoelastic phenomena (creep and stress relaxation) have many things in common First, they both originate from the same source, that is, the hydrated cement paste Second, the strain-time curves of the two are very similar Third, the.

plastic shrinkage. The volume reduction that occurs primarily due to moisture loss after the concrete has hardened is known as drying shrinkage. In addition to drying shrinkage, hardened concrete can also experience volume reductions such as thermal contraction, autogenous shrinkage and carbonation shrinkage. Due to the.

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A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

Cracks formed by restraint to volume changes caused by loss of excess water. The time at which shrinkage cracks occur depends on the rate of drying but is usually several months to three or four years after casting. The loss of moisture from fresh concrete results in a reduction in volume. If the shrinkage movement is opposed by some external.

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Apr 05, 2019 · Drying shrinkage (often, simply shrinkage) is the reduction in volume of hardened concrete due to loss of moisture by evaporation. ... In shrinkage, the loss is due to difference in the relative humidity of concrete and the environment, in creep it is due to sustained applied stress. Advertisement. Advertisement..

According to EN 1992-1-1, drying shrinkage strain develops slowly, since it is a function of the migration of the water through the hardened concrete. Fig 2: Drying shrinkage crack in concrete Expression 3.9 in EN 1992-1-1 gives the development of drying shrinkage strain with time as given in Equation (2); εcd(t) = βds(t, ts).kh.εcd,0 ———————- (2).

Plastic Shrinkage (b). Drying Shrinkage. Plastic Shrinkage. This type of shrinkage menifests itself soon after the concrete is placed in the form while the concrete is still in plastic state. Loss of water by evaporation from the surface of concrete or by absorption by aggregate or subgrade is believed to be the reason for plastic shrinkage.

Drying shrinkage (often, simply shrinkage) is the reduction in volume of hardened concrete due to loss of moisture by evaporation. ... In shrinkage, the loss is due to difference in the relative humidity of concrete and the environment, in creep it is due to sustained applied stress. Advertisement Advertisement.

PSC makes substantial efforts to assure the accuracy of this data. However, PSC assumes no responsibility for the data values and urges that upon final material selection, data points are validated with the manufacturer. In the shrinkage chart for plastic material below you will find various nylon shrinkage rates, PVC shrinkage, and others. Shorten the distance between the gate and the fusion area. Reduce the use of mold release agents. Adjust the gate position so that the plastic melt collides with the pin type or wall after passing through the gate. Change the gate form, use overlapping gates or lug gates, set enough stagnant area in the gate area.

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The shrinkage of plastics signifies the volume contraction of polymers during the cooling step of the processing of polymers. This contraction is partly due to the difference of density of polymers from the melt state and the cooled, rigid state. Most of the plastic molded part shrinkage occurs in the mold while cooling.

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Drying shrinkage is caused by the loss of surface -absorbed water from the calcium silicate hydrate ( C-S-H) gel and also due to the loss of hydrostatic tension in the small pores. Swelling is the opposite phenomenon of shrinkage. This shrinkage is mainly due to the deformation of the paste, though the aggregate stiffness also influences it.

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Apr 05, 2019 · Drying shrinkage (often, simply shrinkage) is the reduction in volume of hardened concrete due to loss of moisture by evaporation. ... In shrinkage, the loss is due to difference in the relative humidity of concrete and the environment, in creep it is due to sustained applied stress. Advertisement. Advertisement..

Plastic shrinkage cracks appear especially in concrete floors and pavements exposed to strong evaporation (Figure 1). The main driving force of plastic shrinkage cracking is evaporation of water that creates menisci and high tensile stresses in the capillary water near the surface. When the bleeding water on the surface of the concrete is ....

A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

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The drying shrinkage of concrete during curing is a source of residual stress and cracks. The problem is particularly severe for a large structure, such as a large concrete floor. ... Treating truck wash-water or returned plastic concrete with stabilizing admixtures delays its setting and hardening, thereby facilitating the incorporation of.

A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

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Plastic shrinkage cracks in concrete slabs. These cracks occur due to the water loss from the concrete. When the evaporation rate is higher than the bleeding rate, the top of the slab surface shrinks due to drying and cracks at the end. Usually, concrete slabs undergo high evaporation due to their large surface area.

Plastic shrinkage cracks are random cracks that sometimes occur in the exposed surface of fresh concrete during or within the first few hours after the concrete has been placed, while the concrete is still plastic and before attaining any significant strength. Such cracks are caused by the evaporation of surface water, and consequent drying and shrinking of the exposed surface of the plastic.

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Surface shrinkage, shrinkage hole (vacuum bubble) Analysis of the causes: the phenomenon of product surface depression. By the plastic volume shrinkage generated, commonly in the local meat thick area, such as reinforcement or column position and face intersection area.

There are 4 types of Shrinkage as listed below. Plastic Shrinkage. Drying Shrinkage. Carbonation Shrinkage. Autogenous shrinkage. Let us discuss all types of shrinkage in detail. 1. Plastic Shrinkage in Concrete. Plastic shrinkage happens very soon after concrete casting.

18 2 CAPILLARY SHRINKAGE CRACKING 19 It can be observed in nature that drying suspensions may crack as a result of water loss. Plastic 20 concrete, i.e., concrete before hardening, exhibits a similar behavior. In Figure 1, the process of 21 capillary pressure build-up which may eventually lead to cracking is shown schematically.

Drying Shrinkage. Contraction of hardened concrete due to the loss of capillary water in the concrete is identified as drying shrinkage in concrete. Drying shrinkage occurs in 3 -4 days or even after several months after concreting. Thin members having a large surface area are susceptible to drying shrinkage cracks in concrete.

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0.6. SAN (30% GF) 0.1. TPE. 2.5. Plastic moulding shrinkage is the contraction of a plastic moulding as it cools after injection. Most shrinkage occurs in the mould during cooling, but some shrinkage occurs after ejection, as the part continues to cool. After that, the part may continue to shrink very slightly for several hours or even days.

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Plastic shrinkage and its probable cracking, the main topic of this research, occurs shortly after casting, while the concrete still is in its plastic phase, Figure 1.1. The phenomenon is defined as the shrinkage of young concrete which occurs due to rapid and excessive drying.

Wet or Dry Mix for Laying Patio Slabs and What Ratios to. 9/26/2016 · I am laying slabs to make a patio area, its approx 15M square, and im not sure whether to use a wet or dry mix for the mortar bed. As this is the first time ive done this, I am thinking the dry mix would be easier, but is it going to set properly, its only going to be for.

Jul 01, 2015 · Plastic shrinkage may lead to cracking that propagates easily due to the very low concrete strength and ultimately impair concrete performance and require expensive repairs. The risk of plastic shrinkage cracking increases with increased evaporation rates, i.e. for exposed surfaces at high wind speed, high temperature and low relative humidity ....

The shrinkage rate of fabric refers to the percentage of fabric shrinkage after washing or immersion in water Stock loss = 140,000$ - 125,000$ = 15,000 $ For example, if grain is dried from 25 percent down to In the example, multiply 0 0 percentage points), the total moisture shrink would be 10 0 percentage points), the total moisture shrink.

The primary cause of "plastic shrinkage" cracks is the rapid evaporation of water from the surface of the concrete. Immediately after the concrete has been placed, the particles within the concrete begin to settle. When the particles settle, the water within the concrete displaces and rises to the top. This process is better known as "bleeding.".

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This paper presents a constitutive model for simulating the swelling-shrinkage volume change of expansive soils during wetting-drying cycles. Based on the concept of the critical swelling-shrinkage state proposed by Zhao et al. [21], the elastic swelling-shrinkage deformation, plastic swelling/shrinkage deformation, and accumulative deformation during wetting-drying cycles were.

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Plastic shrinkage cracks are random cracks that sometimes occur in the exposed surface of fresh concrete during or within the first few hours after the concrete has been placed, while the concrete is still plastic and before attaining any significant strength. Such cracks are caused by the evaporation of surface water, and consequent drying and shrinking of the exposed surface of the plastic.

Plastic shrinkage cracks in concrete slabs. These cracks occur due to the water loss from the concrete. When the evaporation rate is higher than the bleeding rate, the top of the slab surface shrinks due to drying and cracks at the end. Usually, concrete slabs undergo high evaporation due to their large surface area.

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1)Plastic shrinkage. 2)Drying shrinkage. 3)Autogenous shrinkage. 4)Carbonation shrinkage. Now the types of shrinkage are explain as; a) plastic shrinkage :- Due to plastic shrinkage cracks will be appear on the surface of hardened concrete or fresh concrete when its placed on the surface horizontal. The plastic shrinkage occur mostly due to.

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The former is the shrinkage from wet-to-dry. The latter is the shrinkage from dry-to-fired. You cannot add the dry and fired numbers together to get the total because the two are based on different starting points. Consider this example: 6.25 dry shrinkage + 6.66 fired = 12.9 whereas the actual total shrinkage is 12.5%. Shown is the way to .... Jul 01, 2015 · Plastic shrinkage may lead to cracking that propagates easily due to the very low concrete strength and ultimately impair concrete performance and require expensive repairs. The risk of plastic shrinkage cracking increases with increased evaporation rates, i.e. for exposed surfaces at high wind speed, high temperature and low relative humidity ....

The Shrinkage limit, Plastic Limit and Liquid limit together form the Atterberg limits, important for the effect of water on clay or silt soils. The relationship between the three is that the shrinkage limit defines when dry soil becomes friable, the plastic limit is where the soil becomes malleable and the liquid limit where the soil becomes.

Jul 01, 2015 · Plastic shrinkage may lead to cracking that propagates easily due to the very low concrete strength and ultimately impair concrete performance and require expensive repairs. The risk of plastic shrinkage cracking increases with increased evaporation rates, i.e. for exposed surfaces at high wind speed, high temperature and low relative humidity ....

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9. Adding Polypropylene Fibres in Concrete Mix. Polypropylene fibres can be added to the concrete mix to reduce the incidence of plastic shrinkage cracking.Fibres tend to bind the surface of the concrete together and provide some strength to the plastic concrete to resist the shrinkage forces. 10.

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The Shrinkage limit, Plastic Limit and Liquid limit together form the Atterberg limits, important for the effect of water on clay or silt soils. The relationship between the three is that the shrinkage limit defines when dry soil becomes friable, the plastic limit is where the soil becomes malleable and the liquid limit where the soil becomes.

A standard method to measure “mold shrinkage”, i.e. contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets). ASTM D955 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of ....

All materials shrink on cooling due to thermal contraction. The shrinkage of the plastic on cooling from the melt temperature to the mould temperature is known, somewhat perversely, as the mould shrinkage. The principal reason for mould shrinkage is thermal contraction which is measured by the thermal expansion coefficient of the plastic. The.

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Gypsum is a calcium sulphate source which is added to Portland cement to regulate early hydration reactions to improve strength development, decrease flash setting and reduce drying shrinkage. Gypsum and other Calcium sulphate compounds react with calcium aluminate in the cement to form Ettringite, within a few hours of mixing with water.

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🕑 Reading time: 1 minuteShrinkage cracks in concrete occur due to change in moisture of concrete. Concrete and mortar are porous in their structure in the form of inter-molecular space. They expand when they absorb the moisture and shrink when they dry. This is the main cause of concrete shrinkage cracks on drying. Shrinkage of [].

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