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Concrete crushing based on the high-voltage pulse

High-voltage pulse discharge (HVPD) technology has a broad prospect in concrete crushing. The model of concrete beam sections is established by ANSYS/LS-DYNA finite element software. The shock wave, caused by the electrohydraulic effect of HVPD with 50 kJ

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2 Types of Concrete Crushers HXJQ

Aug 01, 2019· Generally, the concrete crushing station is composed of a concrete crusher (sand making machine), a screening machine, a feeder, a conveyor belt, a steel frame, a drive system, an electric control system, a motor unit and the like. Working principle of mobile concrete crusher

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(PDF) Behaviour of concrete columns with drilled holes

Openings and drilled holes are often provided in concrete structural elements to allow . The provision of even one hole resulted in concrete crushing at the level of the . hole.

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Experimental Study and Finite Element Modelling of

Experimental Study and Finite Element Modelling of Reinforced Concrete Column Having An Opening the columns still failed due to crushing of concrete at the ends of columns. Mainly the column failed due to formation of two intersecting diagonal cracks passing through holes. As the concrete has spalled off at this stage, therefore buckled

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PRECAST CONCRETE MANHOLES

Using an allowable concrete stress of 45% of the minimum specified compressive strength of 4,000 psi, the allowable compressive stress would be 1,800 psi. Substituting this value for s yields the following: = 3.4 s H 1,800 = 3.4H then H = 530 feet The above example illustrates that precast concrete manhole

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Can Old Concrete be Crushed for Recycling? FTM Machinery

Nov 29, 2019· Jaw Crushers Most recyclers use a jaw crusher for primary crushing because it can handle large pieces of concrete and residual reinforcement. An excavator loads the concrete into the jaw crusher then it chew the larger chunks of concrete into smaller pieces. It reduces concrete to 60-80 mm which can be usually used as fill.

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Anchoring To Concrete PDHonline

A concrete anchor is a steel shaft either cast into concrete at placement or post-installed after the concrete has hardened. Cast-in anchors are threaded shafts with a buried end termination of a hex head, threaded nut, or 90° (L-) or 180° (J-) hook, or headed (non-threaded) studs welded to a surface plate.

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Why & How to Use Recycled Crushed Concrete Superior

Nov 07, 2019· The first step to recycling old concrete is to use industrial crushing equipment in order to break up the original structure. Next, the broken up concrete is run through a secondary impactor. After being crushed to an even smaller size, the crushed concrete is then screened so that dirt and other foreign objects can be removed.

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Crushing Concrete Cube or Cylinder at 28 days

Apr 01, 2018· Concrete elements are designed on the basis of a 28-day cube’s crushing strength. A 28-day cube’s strength actually represents the characteristic strength of the concrete. It is mandatory to test the concrete cubes or cylinders at the age of 28 days as per almost all building code requirements.

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Several Concrete Elements Affect the Crushing Process

Oct 20, 2012· "Several Concrete Elements Affect the Crushing Process" was written by dupingping under the Technology category. It has been read 944 times and generated 0 comments. The article was created on 20 October 2012 and updated on 20 October 2012. Total comments :

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Nonlinear finite-element analysis of concrete dowels

Sep 01, 1997· As shown in Fig. 14, the cap position is a function of the volumetric plastic strain. In this way, deformations caused by pore crushing can be included. Fig. 7. Element mesh of concrete slab and concrete dowel (elevation). Fig. 8. Element mesh of steel strip with drop-shaped hole. 1276 D. Kraus and 0. Wurzer Table 1.

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Curing Concrete How Long it Takes & How To Cure The

After concrete is placed, the concrete increases in strength very quickly for a period of 3-7 days. Concrete which is moist cured for 7 days is about 50% stronger than uncured concrete. Water curing can be done after the slab pour by building dams with soil around the house and flooding the slab. The enclosed area is continually flooded with water.

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Ways to Recycle and Reuse Concrete

Jan 07, 2019· How Concrete Is Recycled . Concrete is recycled by using industrial crushing equipment with jaws and large impactors. After the concrete is broken up, it is usually run through a secondary impactor and is then screened to remove dirt and particles and to separate the large and small aggregate.

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Aggregate Crushing Value Test Cement Concrete

May 17, 2019· Concept and significance of the Aggregate crushing value test. The ‘ aggregate crushing value test ` gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Aggregate crushing value is defined as the percentage by weight of the crushed (or finer) material obtained when the test aggregates are subjected to a specified load

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DESIGN OF ANCHOR BOLTS EMBEDDED IN CONCRETE MASONRY

Standard Test Methods for Strength of Anchors in Concrete and Masonry Elements, ASTM E488-10, ASTM International, 2010. Allowable Stress Design of Concrete Masonry, TEK 14-7C, National Concrete Masonry Association, 2011. Strength Design Provisions for Concrete Masonry, TEK 14-4B, National Concrete Masonry Association, 2008.

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WO2004070121A1 Techniques for pile breaking Google Patents

The present application relates to a method of breaking a concrete or grout element (10, 20) having a reinforcement means (11) which has been treated such that it will not substantially adhere to the surrounding concrete or grout. One or more expandable elements (12, 13, 14) are cast within the concrete or grout at a desired level and a fluid is supplied to the expandable element in order to

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Construction aggregate Wikipedia

Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates.Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as

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7 Different Crushed Stone Sizes and Their Applications

Jul 27, 2020· #1 The # 1 crushed stone grade is the largest of the crushed stone grades and includes stone between 2-4 inches long. This material is great for larger jobs or for filling in larger holes. #3 This size of the stone ranges from 1/2 to 2 inches long. This material is a great choice for railroad projects and those that require drainage.

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Pulverizer Attachments Concrete and Rock Crusher Epiroc

Down-the-hole drilling tools (DTH tools) our BP bulk pulverizers are ideal for secondary demolition and additional reduction of reinforced concrete elements. Carrier weight class ¹ 10 t 30 t 22,000 lb 66,000 lb (6) 30 t 50 t Crushing force, jaw tip: 115 t 127 tn.sh. Operating pressure:

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Crushing Concrete Wall with Flag of Vietnam Motion

Aug 09, 2020· This video is unavailable. Watch Queue Queue. Watch Queue Queue

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Why & How to Use Recycled Crushed Concrete Superior

Nov 07, 2019· The first step to recycling old concrete is to use industrial crushing equipment in order to break up the original structure. Next, the broken up concrete is run through a secondary impactor. After being crushed to an even smaller size, the crushed concrete is then screened so that dirt and other foreign objects can be removed.

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Experimental Study and Finite Element Modelling of

Experimental Study and Finite Element Modelling of Reinforced Concrete Column Having An Opening the columns still failed due to crushing of concrete at the ends of columns. Mainly the column failed due to formation of two intersecting diagonal cracks passing through holes. As the concrete has spalled off at this stage, therefore buckled

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Several Concrete Elements Affect the Crushing Process

Oct 20, 2012· "Several Concrete Elements Affect the Crushing Process" was written by dupingping under the Technology category. It has been read 944 times and generated 0 comments. The article

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Experimental Study and Finite Element Modelling of

Experimental Study and Finite Element Modelling of Reinforced Concrete Column Having An Opening the columns still failed due to crushing of concrete at the ends of columns. Mainly the column failed due to formation of two intersecting diagonal cracks passing through holes. As the concrete

Ask For Price

Pulverizer Attachments Concrete and Rock Crusher Epiroc

Down-the-hole drilling tools (DTH tools) our BP bulk pulverizers are ideal for secondary demolition and additional reduction of reinforced concrete elements. Carrier weight class ¹ 10 t 30 t 22,000 lb 66,000 lb (6) 30 t 50 t Crushing

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Why & How to Use Recycled Crushed Concrete Superior

Nov 07, 2019· The first step to recycling old concrete is to use industrial crushing equipment in order to break up the original structure. Next, the broken up concrete is run through a secondary impactor. After being crushed to an even smaller size, the crushed concrete

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Crushed Concrete & Concrete Aggregate 101 Superior

Jul 29, 2019· What is Crushed Concrete or Concrete Aggregate? Crushed concrete is made up of asphalt debris from other construction projects that can be reused to create driveways, pathways, garden beds and more. When any concrete structure, road, sidewalk or parking lot is demolished, that concrete

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Concrete Slab Surface Defects: Causes, Prevention, Repair

3. Warm the subgrade before placing concrete on it during cold weather. 4. Avoid placing a slab directly on polyethylene film or other vapor barriers. Use a 100-mm (4-in.) layer of compactible, drainable fill (not sand). A “crusher

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Crushing Concrete Wall with Flag of Vietnam Motion

Aug 09, 2020· This video is unavailable. Watch Queue Queue. Watch Queue Queue

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9 Method Of Demolition For Building Full Explain Process

Nov 18, 2020· 1. Drilling of holes for placing explosives: Holes of 25 mm to 30 mm diameter in columns, piers etc. are drilled at a distance of 200 to 300 mm centre to centre. The hall is properly filled with explosive material. 2. Quantity of explosive: The amount of explosive to be filled in the drill hole

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7 Different Crushed Stone Sizes and Their Applications

Jul 27, 2020· #1 The # 1 crushed stone grade is the largest of the crushed stone grades and includes stone between 2-4 inches long. This material is great for larger jobs or for filling in larger holes. #3

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Hole Company The, Concrete Cutting, Demolition & Crushing

Hole Company The Phone and Map of Address: Unit 34 Kells Business Park Kells Co. Meath, Meath, Business Reviews, Consumer Complaints and Ratings for Concrete Cutting, Demolition & Crushing

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Crushed Concrete Aggregate| Concrete Construction Magazine

Jun 30, 2011· Recycled concrete qualifies for recycled material credits, and because it usually is found locally, it qualifies for local credits. • Concrete with recycled concrete aggregate has a smaller carbon footprint. • Crushing old concrete

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Hammermill Crushers McLanahan

The Centerfeed Hammermill is a secondary crusher designed to accept feed from a primary with controlled top size ranging from 3" to 5" (75mm to 125mm). Industrial Hammermills are not limited to

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Investigation on the fracture mechanism of homogenized

Jul 19, 2019· The homogenized micro-crack crushing technology for concrete pavement maintenance has received increased attention in China. To study the fracture mechanism of the homogenized micro-crack crushing

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Curing Concrete How Long it Takes & How To Cure The

After concrete is placed, the concrete increases in strength very quickly for a period of 3-7 days. Concrete which is moist cured for 7 days is about 50% stronger than uncured concrete. Water curing