The concrete pouring guide that we will be discussing here is about checking ready-mix concrete records. We will be giving you some important notes about ready-mix concrete pouring at the end of this post as well.
Concrete is one of the basic materials being used in construction industry. The approval of this material requires careful checking to ensure quality and conformity with the design requirements as well as standards.
Ready-mix concrete is widely used concrete material in construction because of its variety of advantages. Companies tend to save significant time and energy when using ready-mix concrete especially supplied by a reputable ready-mix concrete supplier.
Here, without further ado, I will be giving you a list of things that need to be considered in your ready mix concrete pouring records.
What are the information that must be available in a particular ready-mix concrete delivery note?
What are the things that need to be checked at the site during concrete pouring?
Checking the Delivery Note
We have to ensure that all required information must be available in the delivery note of the ready-mix concrete supplied to the site or project.
Check your previous ready-mix delivery note if all the following pieces of information can be found at least. This is not necessarily in the same order.
- The name of the ready-mix supplier
- The serial number of the delivery note
- The delivery date
- Truck number
- Complete name of the contractor
- Complete name of the contract or name of the project
- Ready-mix concrete specified workability (the result of the slump test)
- The shade temperature
- Grade of concrete
- Cement type and source
- Source of the aggregates
- The nominal maximum size of the aggregates
- The water-cement ratio
- Time of loading from the ready mix plant
- Time of departure from the ready mix plant
- The arrival time of the truck at the placing area
- The departure time of the truck
- The complete time of the discharge
- Notes or remarks that truck was checked and free from impurities
What to Check at Site?
In addition to the above-required information, the following has to be obtained, witnessed and recorded at the site as well.
- Slump test in situ for each load or truck
- The temperature of the ready-mix concrete upon the truck arrival (for each load or truck)
- The quantity being delivered (or approximate quantity)
- Arrival time interval of trucks
- The obtained number of concrete cubes or cylinder samples to be used for compressive strength test (to ensure an adequate number of samples)
- The exact location and the structure in which a specific load was to be poured
Furthermore, I would like to add on this topic some important notes related to ready-mix concrete.
- The ready-mix concrete supplier must be carefully evaluated and approved by the engineer or client representative, and it must be officially written. All the materials used in ready-mix concrete must comply with the specification. The resources for manufacturing and delivery must be sufficient to ensure appropriate and timely completion.
- The contractor shall agree with the engineer or client representative the following:
- details of the equipment (operating and stand-by)
- method statement (plan, positioning, pour sequence, number of pumps, quality control, safety and risk assessment, factors that might affect pouring, etc.)
- The specification of following below shall also be considered for ready-mix concrete. We will try to tackle these topics in another post:
- trial mixing
- testing and quality of concrete
- The delivery note of ready-mix concrete must be encoded or computer generated.
- Copy of every delivery note must be provided to the site inspector at the site.
- All copies of the delivery note must be attached to the request for inspection and submitted officially to engineers, or client’s representative.
- The available standard for ready-mix concrete is BS 5328. You can also check the conformity of the ready-mix concrete with the mentioned standard.
- The number of revolution of the drum of the concrete mixer must be recorded by an automatic device.
- The amount of water in the ready-mix concrete shall not exceed over the maximum value allowed by the mix design.
- Slump test to be performed at the site must be in conformity with BS 1881.
- The water tank of every truck must always be full upon arrival at the site.
- The load must be rejected in any case the result of the slump is exceeding beyond the acceptable value.
- Daily temperature (maximum and minimum) shall be recorded including the wet bulb temperature.
- Water is not allowed to be added to the concrete mix at the site.
What is the meaning of …?
Concrete Pouring – also known as concrete or ready-mix casting, placing, or merely concreting.
Ready-mix Concrete – also spelled as “ready mix concrete” by others. It is the fresh concrete that is being mixed or produced in a plant known as the batch plant.
Delivery Note – a paper (or document) indicating pieces of information about the material being delivered at site.
Slump test – a test being performed at the site or laboratory for fresh concrete. It being conducted to determine the consistency of fresh concrete in relation to its final setting. It is also being conducted to determine the workability of the fresh concrete.
In situ – at the actual site location
BS 5328 – Specification for the Procedures to be used in Producing and Transporting Concrete
Ready-mix Concrete Topics
Ready-mix concrete is really a broad topic. Hope that in this topic (checking ready-mix concrete pouring records), you have obtained some basic yet essential knowledge for you to confidently proceed with the checking.
I will be trying to post more about the concrete pouring guide topics.
Hope that you found this post helpful, especially for those beginners or fresh graduates who are looking for good reference about this topic. Meanwhile, I would recommend you to read more about standards if you want to dig further technically.
If you have something to share regarding ready-mix concrete topics, I am more than happy to see it in the comments section below.