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A
Seminar
on
WEB BASED
QUALITY CONTROL
of READY MIXED
CONCRETE
By
Sumit Kumar Dutta

INTORDUCTION
 Ready mix concrete is popularly called as RMC.
 The first ready mix factory which was built in
1930’s.
 The consumption of cement in the form of RMC is
about 5% in India, where as in developed countries
it’s about 70%.
 The leading RMC supplier worldwide is the
mexican concrete and cement company cemex.

Definition
 The Indian Standard Specification IS 4926:2003
defines RMC as:
“Concrete mixed in a stationary mixer in a central
batching and mixing plant or in a truck-mixer and
supplied in fresh condition to the purchaser either
at the site or into the purchaser’s vehicles”..

Concept of RMC
 Ingredients are weigh batched at centrally located plant .
 Delivered to the construction site in transit mixers and can
be used straight away without any further treatment.
 RMC is manufactured under computer-controlled operations
and transported and placed at site using sophisticated
equipment and methods

QUALITY CONTROL OF RMC
As per IS 4926_2003
 Forward control
 Immediate control
 Retrospective control

Forward control
 materials storage,
 monitoring of quality of materials,
 modification of mix design
 Plant maintenance
 calibration of equipment
 plant and transit mixer condition.

Immediate control
• Weighing
• Observation of concrete during production,
• Workability of the fresh concrete
• Making adjustments at the plant automatically
or manually to batched quantities
• Inspection at delivery by driver and customer
for uniformity and adjustments to workability
within company policy.

Retrospective control
• Sampling of concrete
• Testing and monitoring of test results
• Stock control of materials
• Diagnosis and correction of faults identified from
complaints

Web based system for quality
control of RMC
 Computer is making companies’ business easier, providing
better communication and reducing costs
 Marketing, procurement , tendering and cost control are some
examples for applying electronic commerce in construction
processes
 Many construction companies have now their own web sites
and they share information with other team members by using
the Internet

Method
 The program simply connects the manufacturer and the
customer
 program checks the properties of the materials used in
concrete production, the properties of fresh and hardened
concrete
 informs the responsible persons included in the job
 reduces the costs and prevents possible delays by means of
continuous checking at every stages of the production of
concrete.

System properties
STEP 1
consists of five options for data entering in the main
menu including
 Order list
 manufacturer list
 waybill list
 sample properties
 vehicle track

Step 2
 customer orders the RMC through this web page on the
Internet by selecting the order list menu
 all necessary data about delivery and properties of concrete
and customer’s personnel information are available and
filled by the customer

Step 3
 Having obtained all informations from the customer, concrete
characteristics are entered by the manufacturer according to
the customer’s order.
 This procedure is done either manually or automatically by
the computer
 system checks and compares the given data both from the
customer and manufacturer to prevent any differences in
concrete properties

Step 4
 Time intervals for transportation of the concrete are entered
into this program in the waybill list menu
 manufacturer enters the corresponding data before the
 truck-mixer leaves the batching plant and when it arrives to
the construction site
 customer enters the relevant parts in this menu when the
concrete arrives at the site.
 temperature of the concrete is measured both at the batching
plant and the site and entered by the manufacturer and the
customer,

Step 5
 The sample properties menu option includes the test results
obtained from the concrete samples
 system checks the results according to the relevant standards

Step 6
 If the required standard values would not be obtained from these
results, the system gives some warnings to the responsible parties
either by e-mail or phone messages.
 Using the sending options in the main menu, contact addresses are
added to the program by which manufacturers could easily
communicate with the other parties or customers

Vehicle tracking
 location of the truck, its speed, driver information, the load
carried and in which direction the truck moves are checked any
time by erecting a General Packet Radio Service (GPRS)
device on the truck
 Continuous Internet connection is provided and information are
sent or received immediately by using this system

Temperature control
 the temperature of the concrete inside the truck-mixer is
followed by using this device.
 temperature is measured periodically by the GPRS system and
data are transferred to the main system via satellite
 If the concrete temperature reaches to undesirable values at
that time interval, necessary precautions are taken
immediately by this system
 if such an event happens, the manufacturer calls the truck-
mixer back to the batching plant

Solution
 Erecting an additional system that adds a retarding admixture
immediately after the warning of the GPRS system
 this program provides to give warning messages when
entered data are not compatible with the relevant standards
 Finally, the main system transfers data about the required
amount of aggregates, water, cement and admixtures in the
batching plant directly to the Internet.

communication pattern between the batching plant, construction site and truck-mixer

Advantages
 program improves the quality control of the RMC.
 It allows a closer customer–supplier relationship
 It saves time
 It extends planning time for the manufacturer
 It reduces the costs
 Immediate access to data is provided for the customer while
all information is transferred instantly to the Internet
 Mistakes are avoided
 labor work is reduced by computerization
As a result, the efficiency of the quality control is improved.

CONCLUSION
This new way of the quality control of RMC
creates a better-qualified work and the
opportunity for the companies to improve their
business methods

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151577

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