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Guidance for the Sampling and Analysis of Concrete Designated for - state nj

Guidance for the Sampling and Analysis of Concrete Designated for - state nj 2025

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The document provides an updated guidance from the New Jersey Department of Environmental Protection regarding the sampling and analysis of concrete designated for recycling. It emphasizes the importance of in situ sampling prior to demolition as the preferred method for assessing contamination levels, clarifies requirements for sampling and analysis, and outlines procedures for self-certification of clean sites. The guidance aims to ensure that recycled concrete does not contaminate clean sites and complies with relevant environmental regulations.

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What is the code for sampling and analysis of concrete?

IS 1199:1959: Methods of sampling and analysis of concrete. As you know, testing of the raw materials for concrete and concrete, both fresh and hardened, should be part of the quality control program.

How often should concrete samples be taken?

Samples for strength tests of each class of concrete placed each day shall be taken not less than once a day, nor less than once for each 150 cubic yards of concrete, nor less than once for each 5000 square feet of surface area for slabs or walls.

How do you store concrete samples?

At the end of 20 hr 4 hr, remove the lids from the cylinder molds and store the specimens in a water bath at a temperature of 60F to 80F. At an age of 2 d and no later than 5 d, replace lids. Reseal with masking tape and ship directly to the laboratory. At the laboratory, specimens must be stored at 73F3F.

Where should concrete samples be taken?

Samples should be taken as close to the point of placement as possible. Many times they are obtained at the point of discharge of the concrete from the mixer. Other points of sampling may be specified, such as the discharge of a concrete pump.

How to take samples of concrete?

If water is added to the mixer to adjust the slump at the site of the work, sample after the water is added and the concrete is thoroughly mixed. Sample by repeatedly passing a receptacle through the entire discharge stream, or by diverting the stream completely so that the whole stream discharges into a container.

How to take concrete core samples?

Drill cores perpendicular to surface and not near formed joints or obvious edges of a concrete placement (unit of deposit). D. Take cores near the middle of a concrete placement (unit of deposit) when possible. In columns or walls, for instance, samples should be taken near mid-heightnot at the top or bottom.

Guidance for the Sampling and Analysis of Concrete Designated for - state nj 2025

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