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Green Concrete from Sustainable Recycled Coarse Aggregates ...

Present investigations deal with the development of green concrete (M 30 grade) using recycled coarse aggregates for sustainable development. Characterization of recycled coarse aggregates showed that physical and mechanical properties are of inferior quality and improvement in properties was observed after washing due to removal of old weak mortar adhered on its surface.

Materials | Free Full-Text | Probabilistic Conversion of ...

This paper investigates the effect of recycled coarse aggregate incorporation on the relationship between 150 mm cubic and Փ 150 mm cylindrical compressive strength (the reference strength of standards) by comparing data from recycled and natural aggregate concrete compositions in which both cubes and cylinders were tested. A conversion factor from cubic to cylindrical strength is proposed in ...

Nike Shoes — Design Life-Cycle

Nike being such a massive corporation, has its products in high demand. The embodied energy and process of production, distribution, dissembling, and recycling can be broken down. The production of the shoe is an intensive process with a collaboration of …

Concrete Cube Testing Machine, Cube Compression Testing ...

We are an ace manufacturer, trader and supplier of Concrete Cube Testing Machine and have marked our name very strongly in the market at present. It is meant for testing the concrete cube which is part of a simple yet cost effective test process that allows in judging compressive strength of concrete as well as for quality assurance to ensure concrete is fit for defined purposes in line with ...

Carbonation of concrete - Understanding Cement

Carbonation is the result of the dissolution of CO 2 in the concrete pore fluid and this reacts with calcium from calcium hydroxide and calcium silicate hydrate to form calcite (CaCO 3 ). Aragonite may form in hot conditions. Within a few hours, or a day or two at most, the surface of fresh concrete will have reacted with CO 2 from the air.

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Concrete Testing Procedures - Tests for Slump & More ...

Air-entrained concrete is typically specified in areas of the country where frost-related damage can occur. The measurement of air content in fresh concrete of normal density is typically performed using the pressure method ().Another useful test is ASTM C 173.However, the pressure method is frequently preferred because it is relatively fast.

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Comparative analysis on natural and recycled coarse ...

First, we had casted the test cubes and the sizes are 150 × 150 × 150 m m and quantities we got based on our calculations, & we used Water – Cement ratio in our mix is 0.55, We tested the cubes for the compression strength of prepared concrete cubes with the help of CTM (compressive testing machine) because compressive strength is the major ...

Testing of Strength of Recycled Waste Concrete and Its ...

The specimens used for testing include cubes, cylinders, and flexural beams. The influence of admixtures on the strength of waste concrete was examined. The compressive strengths of FCM, WCM, and SWCM are compared and the results show that there is not much difference in the strengths of FCM and SWCM after 28 days.

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List of Chemical Plant and Equipment Companies in India ...

Pune - India. Manufacturer and Exporters of Construction Machinery Like Bar Bending And Cutting Machine, Concrete Pump, Boom Placer, Concrete Mixer, Earth Compactor, Weigh Batcher, Needle Vibrator & Slab Trolley. Supplier of: Mixers and blenders for the chemical industry. Chemical industry plant and equipment.

Automation in Construction

though concrete may be recycled, the recycling process involves mul-tiple treatment stages such as sorting, crushing, and cleaning, thus in-creasing the cost. In practice, recycled concrete is used as a lower grade concrete compared with normal concrete. The recycling rate of C&D wastes is limited. While roads and bridges annually produce>150

Saroj MANDAL | Professor | Ph.D ( Engg.) | Jadavpur ...

About 144 numbers of borehole data collected from several soil testing agencies in the Kolkata city, are taken in the present analysis. ... to prepare concrete. Cubes and cylinder test s ...

Physico – mechanical properties of multi – recycled ...

This research examines the possibility of multiple recycling of concrete, as it is shown in Fig. 1, from some rejected precast concrete pieces is generated recycled aggregate, with which is made recycled concrete afterwards; with the possibility of repeating the process as often as necessary.Fresh and hardened properties of recycled concrete made with recycled concrete coarse aggregate from a ...

Recycling of Waste Concrete - The Constructor

Waste concrete generated due to concrete cube and cylinder testing, destructive methods of testing of existing structures etc. Advantages of Concrete Recycling: Usually demolished concrete were shipped to landfills for disposal, but due to greater environmental awareness, the concrete is being recycled for reuse in concrete works.

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A Simple Guide to Concrete Cube Testing - QEM Solutions

Cube Testing The cubes are generally tested at 7 & 28 days unless specific early tests are required, for example to remove a concrete shutter safely prior to 7 days. Usually 1 cube will be tested at 7 days and 2 cubes at 28 days, however this may vary depending of the requirements, check the design first.

Experimental Study on the Behavior of R.C.Beams and ...

The practice of recycling of demolished concrete for use in pavements and sub grades ... The aggregates are prepared by breaking already tested concrete cubes available at Structural Laboratory and are properly sieved and brought to size of 20mm (Maximum) ... The treatment process adopted is the one that is adopted by Rajprasad (2006) [6] as ...

Waste concrete for recycling: concrete cubes and precast ...

Waste concrete for recycling: concrete cubes and precast column. ... by crushing the waste concrete of laboratory test cubes and precast concrete columns. ... in a gravity concentration process ...

Influence of field recycled coarse aggregate on properties ...

This paper investigates the influence of different amounts of recycled coarse aggregates obtained from a demolished RCC culvert 15 years old on the properties of recycled aggregate concrete (RAC). A new term called "coarse aggregate replacement ratio (CRR)" is introduced and is defined as the ratio of weight of recycled coarse aggregate to the total weight of coarse aggregate in a concrete ...

How concrete block is made - material, manufacture, used ...

The concrete commonly used to make concrete blocks is a mixture of powdered portland cement, water, sand, and gravel. This produces a light gray block with a fine surface texture and a high compressive strength. A typical concrete block weighs 38-43 lb (17.2-19.5 kg).

A Quality Engineers Guide to Concrete Cube Testing

Concrete is one of the widely used building materials on planet earth. Concrete has a reliable reputation, durable and useful material. Surprisingly, people always find it challenging to take samples correctly and manage the concrete cube testing as well as the certification process. A comprehensive strength of concrete cube test provides an idea about all the characteristics of …

Thesis Case Study Report by Bhanu Mahajan -

Process The A-Frame structure is lifted off the ground on columns having standard RCC footings, The members of the structure are 6 ft in length with a cross section of 8"x8". All inclined ...

Concrete test cube manufacturing and curing procedures ...

The strength of concrete is generally measured by testing concrete cubes which are prepared from the concrete used in that particular construction. The cube strength of concrete is specifi ed by a structural engineer and is assessed by crushing concrete cubes at a specifi ed age (28 days after casting).

Abhijit Mistri - Curtin University - Kolkata, West Bengal ...

The analysis of test results reveals no significant degradation of the building after the fire which signifies that the structure can be used with full expectancy of performance for the remaining service life. This document can be used as a reference for future forensic investigations of …

Recycled Concrete Aggregate Research Papers - Academia.edu

Strictly from the experimental findings, there is Improvement in thecompressive and tensile strength of concrete with steel fibres and SBR after 28 days of testing. The compressive strength increase in SFRC, PMC, and PMSFRC is 31.98%, 16.93%, and 36.16% …

Behaviour of Recycled Coarse Aggregate Concrete: Age and ...

Mixture Proportion. The concrete cubes were mixed with different w/c ratio according to IS: 10262-1982 [].As the w/c ratio varies, the cement content also varies from 620 to 286.15 kg/m 3 respectively. Water content was kept constant as 186 kg/m 3 for all the mix. For other tests such as air permeability, shrinkage and capillarity action the respective samples were casted with cement content ...