· So the recommendation in this article is that when casting a topping layer of fresh concrete on old concrete, adhere to the following guidelines; (1) Prepare the surface properly. (2) Make sure that the substrate is at saturated surface dry condition. (3) Use a bonding agent and follow the manufacturer’s technical recommendation properly.
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The pH values for the old concrete indicated that there is no corrosion of the steel rebar’s. Nevertheless, the old concrete has large variations in depth of the carbonated zone ranging from 20 to 55 mm. Despite the
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:Civil EngineeringConcrete Arch BridgePublish Year:2021old concrete before the addition of fresh concrete but in modern market, number of chemicals are available in market that can contribute to the bonding strength at the
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· The modulus of elasticity assumed for investigated old concrete is 1.55 times greater than the value specified in regulations [], possibly due to various aggregates types in concrete mixes. Based on the early experimental investigation performed by Ambroziak et al. [ 30 ] it can be concluded that the 95-year-old concrete has good
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The U-value is the measure of heat transmittance through a material and the lower the U value the less heat is transmitted through a construction i.e. the better the insulation quality. For concrete the k-value depends on its bulk density and the moisture content in service. (CIBSE guide Table A3.1., 1980) For further information see U-values
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· Making Old Concrete New Again (and Even Better) By Concrete Craft. September 17, 2015. While concrete is one of the hardest and most durable finishes for outdoor landscaping, walkways, and driveways, it’s not indestructible. Especially in colder climates, salting to combat snow and ice can eventually pit the surface and make it look
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· For best results, mix and apply one bag of resurfacer at a time. One 40-pound bag will usually require six pints of water. Use warm water in cool temperatures, and cold water in warmer temperatures. At 73 degrees Fahrenheit, you will have about 20 minutes of working time before the resurfacer hardens.
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· The investigation found the following conclusions: The mean dry density value equalled 2114 kg/m 3 and fulfilled the requirements for normal weight concrete. The mean value of the water absorption of old concrete equalled 5.39 ± 0.13%, and this concrete could be categorized as having a poor concrete quality.
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· Key Takeaways: The minimum required thickness for pouring concrete over existing concrete depends on factors such as the application method and the size of aggregates in the mix. Newly-poured concrete does not naturally bond to the existing slab, so it’s important to address bonding restrictions. Assess the structural soundness of the
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The structural analysis of a 95-year-old concrete arch bridge located in Jagodnik (Poland) is performed in this paper, in order to check its behavior under today’s traffic loads. The mechanical properties of both the concrete and the reinforcement are investigated by testing cores and bar stubs extracted from the bridge. Structural analysis confirms that
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· Here are a few ways to reuse and upcycle old concrete. (877) 265-8369, (323) 663-4841 [email protected] Mon-Fri: 9:00-5:00 Facebook-f X-twitter Instagram Linkedin Customer Login Call us! Facebook-f
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· interface between new concrete (overlay) and old concrete (substrate) plays an important role in the strength values gener ally fall within the ranges reported else-where (Beushausen, 2010; J
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:Interface RoughnessOld Concrete Strength · The chloride content of the old concrete did not exceed 0.2% by mass of cement; thus, the old concrete arch bridge was not exposed to chloride attack. The pH
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· Furthermore, Oertel et al. acquired pore solution of ultra-high performance concrete by a two-step centrifugation (5 min at 5000 rpm and 90 min at 200 rpm) and measured the pH value of the concrete pore solution with an electrode [13]. 3. pH measurement methods
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In the equation: φ represents the mass content of old mortar of RA.f(φ) represents the ratio of the quantity proportion of RA with old mortar content of φ to the interval width of abscissa, i.e., relative frequency/interval width.β represents the abscissa value corresponding to the peak of the curve, which is defined as the old mortar content coefficient in this paper.
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· New/old concrete interface is usually the weakest zone in repair of concrete substrate, wet-joint of precast elements and overlay of concrete bridge. In this study, superplasticizers with coupled functions of new/old concrete interfacial agent and water reducer were developed by using silane to modify polycarboxylate superplasticizer
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· In this study, the field evaluation of the old concrete in a historical reinforced concrete structure (a stadium) has been conducted using destructive and nondestructive methods. The extent of the damage and unseen patterns of concrete
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· Abstract. New-to-old concrete interfaces, which widely exist in concrete structures, are commonly regarded as weak links. Hence, many researchers have studied the splitting tensile bond behavior of concrete interfaces. However, these studies were focused on the behavior under quasi-static loading.
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:Publish Year:2021Concrete Arch BridgePublished:2021/04 · To investigate this, straight shear tests were conducted on a total of 24 concrete Z-type specimens, consisting of 14 new and old specimens without dowel bars and 10 specimens with dowel bars. This study explores the impact of multiple factors on the interfacial shear strength of concrete specimens.
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If this school is built using single wythe concrete masonry walls with cell insulation only and a resulting wall R-value of 7 hr.ft2.oF/Btu (1.23 m2.K/W), an estimate of the building envelope energy use for this structure is approximately 27,800 Btu/ft2 (87.7 kW.h/m2), as shown in Figure 1.
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· As presented in the earlier assessment [1], the overall condition of the aged concrete in the historical structure presented ‘very poor’ conditions, including cracking, scaling, rebar corrosion, carbonation, spalling of concrete, etc. However, the assessments were local and thereby restricted a thorough assessment of the overall performance
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This is a nominal value most product manufacturers specify when concrete is dry enough to allow their product to lay down on it. However, concrete with a moisture content of 5.5% is in equilibrium when the relative humidity of the ambient air is 90%. If the ambient relative humidity is lower, like, 60%, the equilibrium moisture content of
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Request a Callback. +1 800 329 3375. Supporting equipment all across the U.S. /. +1 800 329 3375. /. [email protected]. Every week contractors make thousands of dollars recycling and repurposing concrete. Learn how concrete is crushed, re-used, and sold.
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· Paving your driveway with concrete will increase your property value and curb appeal. There are many benefits to having a paved driveway, especially when it’s concrete. How much your property value rises depends on the quality of the work, market conditions, and other homes in the area. And, of course, whether or not your driveway is
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· Evaluation of existing concrete structures. The ACI developed ACI 562 (ACI, 2016) to provide minimum requirements for evaluating existing concrete structures and subsequently developing repairs. This document has not yet been adopted as part of the building code but in the interim can be used by design professionals to provide
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· In the present paper, some new–old concrete specimens with different chiseled depths at the interfaces were made to simulate the wet joints of precast concrete structures. The distribution characteristics of the coarse aggregate volume fraction in the interfacial zones of new–old concrete specimens were obtained by DIP (Digital Image
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:Civil EngineeringConcrete and CementCoarse Aggregate Distribution · Proper assessment of the properties of old concrete is critical to make decisions regarding the reconstruction and repair of old concrete structures.
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:Civil EngineeringInterface RoughnessConcrete and Cement · There are a large number of interfacial zones of new–old concrete in precast concrete structures, and the wall effect causes the reduction of coarse
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Step 1: Clean the Concrete. For surface preparation, wear heavy boots and protective glasses and blast off surface dirt with a gas-powered pressure washer that can reach at least 3,500 psi. Fit the wand with a 25-degree fan tip, and hold it 6 to 8 inches from the surface as you clean the concrete with slow, even sweeps.
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References Jedidi M (2018) Evaluation of the concrete quality using destructive and non–destructive tests. MOJ Civil Eng 4(4): 219-223. Breysse D (2012) Non-destructive evaluation of concrete strength: a historical review and a
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Trituradora de piedra vendida por proveedores certificados, como trituradoras de mandíbula/cono/impacto/móvil, etc.
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