The current construction industry is changing too fast. The designs have become robust than ever, the materials are produced with a higher degree of quality control and the process of making concrete has been locally standardised. The new ideas, big data, sophisticated software, high precision technology are aiding the supply of higher quality concrete. The article covers the following contents- a. Introduction b. Types of Concrete for Modern World Construction Requirements c. Self-Compacting Concrete d. Self-Healing Concrete e. High-Performance Concrete f. Light Weight Concrete g. 3-D Printed Concrete h. Conclusion

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Civilverse Admin 3 July 2021
5 Types of Concrete for Needs of Modern World
Construction
civilverse.org/modern-types-of-concrete
Table of Contents for Types of Concrete-
1. Introduction
2. Types of Concrete for Modern World Construction Requirements
3. Self-Compacting Concrete
4. Self-Healing Concrete
5. High Performance Concrete
6. Light Weight Concrete
7. 3-D Printed Concrete
8. Conclusion
1. Introduction
The current construction industry is changing too fast. The designs have become robust
than ever, the materials are produced with a higher degree of quality control and the
process of making concrete has been locally standardised. The new ideas, big data,
sophisticated software, high precision technology are aiding the supply of higher quality
concrete.
Concrete is the flag-bearer product in the construction material research field. No
wonder, it is the most used product. Concrete is their core element of sky-kissing
buildings to giant bridges to your favourite hotels & malls.

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In this article, I present to you the five types of concrete that have been developed
considering the modern-day requirements. Their properties are unique in their own way
and have their application from place to place. A type of concrete needs no compaction,
the other can repair its’ cracks and some other concrete type is lighter than the normal
concrete.
Let us dive in.
2. Types of Concrete for Modern World Construction
Requirements
21 Century is the era of smartness. Smartness reflects in our surroundings. To match the
pace with the constantly developing new requirements, the concrete has become smarter
too. With access to better techniques, focus on sustainability, better utilisation of
resources and time and cost-effective requirements, the developments in concrete are
bound to happen.
st

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The modern world construction designs are higher, thinner, complex and more unique
than before. This leads to the development of materials that can cater to challenging
needs. The materials need to have the following characteristics-
1. Higher Strength to carry higher loads. Thus, resulting in slimmer design.
2. Sustainability- The carbon footprints of the material should be least from its’
production to the use and disposal after useful life.
3. Easy to produce- Such materials would be generally more economical.
4. Easy to handle, transport and use- The material should be able to be
transported to higher levels and used in different conditions.
5. Maintenance free- The maintenance cost of the structure should be lower to
justify the capital expenditure on the structure. Thus, the material used in
construction should have no or least maintenance.
6. Light weight- This will enable the designs to me slimmer as the self-weight will be
lesser.
7. Easily Available- The local availability of the material will have lesser
transportation cost and higher acceptance.
3. Types of Concrete: Self-Compacting Concrete
If you are a civil engineer, you already know the importance of the compaction of
concrete. The uncompacted concrete contains tiny air pockets that weaken the concrete.
For 1% volume of air bubbles in a concrete sample, the compressive strength of concrete is
reduced by 5%. However, the flexural strength is not affected much.
Now, consider concrete that doesn’t need compaction. It flows into every corner of the
formworks, fills all the empty spaces between the reinforcement bars and leaves no room
for air. This way, your structure will be free of honeycombs due to improper filling of
concrete between formwork and heavy reinforcement. Such type of concrete exists and is
known as Self-Compacting concrete.
The self-compacting concrete has higher workability and doesn’t need external vibrations
for compaction. Moreover, a well-prepared self-compacting concrete mixture is free of
segregation and bleeding.

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Slump Flow Test for Self Compacting Concrete. Image Courtesy- Researchgate
3.1 Composition of Self-Compacting Concrete-
It is prepared as normal concrete but with additives. The chemical additives used are
superplasticisers that maintain the concrete’s fluidity. The air-entraining agents added to
the concrete prevent the concrete from freezing and thawing.
The mineral additives used are ground granulated blast furnace slag, fly ash, silica etc.
3.2 Uses of Self Compacting Concrete-
1. Pipes/Conduits
2. Pile foundation
3. Heavily Reinforced Sections
4. Columns with higher lift height where external vibration is difficult
5. Jacketing of existing structure
4. Types of Concrete: Self-Healing Concrete
The weak nature of concrete in tension is one of the biggest drawbacks of concrete. The
cracks develop in the tension zone leading to lesser durability. The reduced life of the
structure is mainly because of the entry of harmful liquids and gases into the cracks. If the
crack is up to the reinforcement, the foreign material may corrode it causing deterioration
of the structure.
The concrete has the property of healing the cracks itself by hydration of cement. This
property only works for tiny cracks when sufficient water is available. However, the
property of crack repairing can be induced in the concrete by adding additives. The

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concrete that can heal its’ cracks is called Self-healing concrete or Self-repairing concrete.
Crack Repairing of Self-Healing Concrete. Image Courtesy- Delft University
The researches have been going on since 1994 to develop Self-Healing Concrete and
implement the technology on real structures. The lab-results are promising but it is yet to
be tested on the real structures on a vast scale.
4.1 Methods of Self-Healing
1. Capsule Based Self-Healing Method- Urea-Formaldehyde capsules of 20-70
micron filled with epoxy resins and gelatine microcapsules achieved self-healing of
concrete under compression and splitting.
2. Vascular Self-Healing Method- Air curing healing agent provided by glass
tubes. The tubes depleted upon cracking of concrete. The external healing agent
could be added to the cracks for enabling self-healing mechanism.
3. Electrodeposition Self-Healing Method- Theconcrete cracks are treated with
solution and electric current is passed through it. This enables the electrolysis and
deposits the electrode material to deposit on the crack. Read the full article on
electrodeposition method here.
4. Microbial Self-Healing Method- The bacterial action can heal the cracks and
also makes the concrete water-tight.
5. Self-Healing by Embedding Shape Memory Alloys- Shape Memory Alloys
used as reinforcing material can repair the damage in emergency. The super-elastic
behaviour closes the cracks.
4.2 Uses of Self-Healing Concrete
The bacteria-based self-healing concrete has been used in a canal project in Ecuador.
After one year of canal usage, the concrete was found to be crack-free and water-tight.
1. Liquid Storing or Conveying Structures.
2. Structures subjected to tension.
5. Types of Concrete: High-Performance Concrete

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“A concrete meeting special combinations of performance and uniformity requirements that
cannot always be achieved routinely using conventional constituents and normal mixing,
placing, and curing practices.”
American Concrete Institute
In Europe, concrete having a compressive strength of more than 60 MPa and a water-
cement ratio lower than 0.4 is termed high-performance concrete. The
High-performance concrete is generally prepared with the same material as normal
concrete. It is the proportion, procedure of preparing, placing and curing the concrete
that makes it high-performance.
5.1 Materials Used for High-Performance Concrete
1. Cement- The cement used is OPC of grade 43 and 53.
2. Superplasticisers- The superplasticisers used should be compatible with the
cement. The optimum % of superplasticiser against the cement content should be
determined in lab. It is generally 0.8-1.5%.
3. Silica- The addition of silica fumes makes the concrete more impervious and
economical.
4. Aggregate- The aggregate size used is smaller than in the normal concrete.
5. Slag
The attached image shows the prediction and actual effects of water content, cement
content and coarse to fine aggregate ratio on the slump of High-Performance concrete
prepared using super-plasticisers.

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Image Source- Here
5.2 Uses of High-Performance Concrete-
The high-performance concrete can be used where the strength requirement is more and
the member cross-section is to be kept minimum.
1. Bridges
2. High Rise Structures
3. Highway Pavements
4. Tunnels
6. Types of Concrete: Light Weight Concrete-
The weight of the normal concrete ranges between 2250 to 2400 kg/m^3 (140-150
lb/ft^3). The self-weight of the concrete is considered in the design. Thus, resulting in
bigger cross-sections. However, if the concrete weight is reduced by some method, the
design will be more optimum for cost. The concrete that is lighter in weight than normal
concrete is called lightweight concrete.

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The light-weight concrete has a density of 1440-1840 kg/m^3 (90-115 lb/ft^3). The 20-
35% reduction in self-weight causes a significant reduction in structural member sizes.
Also, lightweight concrete has better thermal insulation. High-strength lightweight
concrete up to 50-60 MPa can be produced by adding suitable binding material and
admixture but it will also increase the density of the concrete.
Lightweight Concrete. Image Courtesy- Boral
6.1 Types of Light Weight Concrete-
1. Light Weight Aggregate Concrete- One of the methods of reducing the weight
of the concrete is to use light weight aggregates. Pumice, expanded shale, kiln fired
clay or slate, air-cooled blast furnace slag etc. are light weight due to porous nature.
These materials are good to be used as light weight aggregate. The porous nature of
aggregate requires more water. Hence, pre-soaking of aggregate is recommended to
control the water-cement ratio.
2. Aerated Concrete- The concrete is light weight due to increase in volume. The air
voids are created in the concrete by means of chemical reaction or using air-
entraining agent. It is also self-compacting concrete. Thus, the water requirement is
low and it can be used for hard-to-reach spaces. The aerated concrete is easy to
handle, place and finish.
3. No Fines Concrete- Another method of making concrete light weight is by using
only coarse aggregate. Due to absence of fine aggregate, the air voids are present in
the concrete, that reduces the weight of the concrete. The shrinkage is also lesser for
No fine concrete.
6.2 Uses of Light Weight Concrete
The main purpose of lightweight concrete is to reduce cost and to increase thermal
insulation. However, strength is a limiting factor. As a result, it is best suited for the
following uses-

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1. Partition Walls
2. Thermal Insulation
3. Flooring
4. Sewer systems
5. Addition of new floors over existing structures
6. Precast Members
6.3 Limitations of Light Weight Concrete
1. The primary setback of light weight concrete is the limiting strength. High-
performance light weight concrete has an upper cap to the strength of 50-60 MPa.
2. No fines concrete is not suitable for RCC.
3. As the water requirement of light weight aggregate concrete is low, it takes more
time for drying.
4. No fines concrete easily leads to segregation due to improper mixing.
7. Types of Concrete- 3D Printed Concrete
The construction industry has started to witness the breakthrough to a completely new
technology i.e., 3D concrete printing. It is the process of placing concrete into flat thin
layers through a computer-controlled nozzle called a 3D printer. A 3D concrete printer
can place the concrete into any shape and size with a high degree of precision.
3D Printer Concrete. Image Courtesy- Sika
The 3D printed concrete is the gateway to futuristic designs. The designs that were not
possible due to the limitation of formwork application can be easily constructed. The 3D
printed concrete doesn’t need formwork or labour.

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A 3D printer deposits the layers of concrete over another by moving back and forth. It can
be a gantry type or a robotic arm type. The concrete is aerated to allow easy flow through
the nozzle. The materials used for the concrete are essentially the same as the normal
concrete.
Gantry Style 3D Printer. Image Courtesy- 3DNatives
7.1 Benefits of 3D Printed Concrete-
1. Reduced time of construction.
2. No formwork requirement.
3. No labour requirement.
4. Higher quality control.
5. Lesser curing time. Minimum of 3 days.
6. Increased safety due to no workmen requirement.
7. Cost effective.
8. Sustainable. As the formwork wastage is not generated.
9. Can construct mass-accommodation in tight schedule in case of disaster or
rehabilitation.
7.2 Limitations of 3D Printed Concrete-
1. Equipment- For some complex shapes and size, project specific printers are to me
made.
2. Unsuitability for hot regions- Higher temperature adversely affects the
hydration of concrete resulting in poor quality control.
3. High Capex Cost- The 3D printed construction is cheaper but the printers are not.
The printer costs from $180K to $1M.
8. Conclusion

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All the above mentioned six types of concrete have their own pros and cons. However,
their utility in modern construction is undeniable. The uses of each type of concrete are in
multiple domains that offer more choice to the consumer.
The extensive ongoing researches on concrete throughout the world will provide more
efficient solutions to the construction industry. It is evident with the current
developments that the future holds many promising concrete types that will be cost-
effective, high-strength, more durable and sustainable.
What do you think of the concrete for the future? Share your thoughts with the world.
Comment below.
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Happy Engineering!