About project

Definitions

HSLWC (abbr. high-strength lightweight concrete) is kind of concrete which has highest strength characteristics and lowest average density. The high-strength lightweight concretes is called concretes with specific strength Rsp more than 25 MPa.

Specific strength (Rsp) is ratio of compressive strength Rcom to relative density of the material (ratio of concrete average density to the true density of water).

Open panel
  • Registration

Scientific and technical goal of project "High-strength lightweight concrete" is creation of technology of high-quality building materials to increase efficiency of building and decreasing the cost of the specific area. Main task to achieve this goal is formulated: develope technology of new kind of concrete multifunctionaldestinationwitha universal set ofperformance properties.

Improving the quality of concrete as a most popular building material is a global trend which aimed to combine the positive attributes of light and heavy concretes. That is decreasing the average density and increasing the strength of concrete can to provide structural and heat insulating properties of these materials at the same time. But reduction the density of concrete less than 1800 kg/m3 leads to significant loss of strength and bearing capacity all in all.

Authors of this project developed technology of energy-efficient high-strength lightweight concrete (HSLWC) which has average density 1300-1500 kg/m3 and class of strength more than B45. Our concrete is almosttwice lighter and warmer than traditional heavy concrete, but it has the same high strength and freeze-thaw resistance (more than F300). Such properties are not possible for cellular concrete which are used today.

The high-strength lightweight concrete is fine-grained concrete which contains microscale spherical particles of filler. These microspheres together with special components of the cement-mineral composition and peculiar modifiers allow to form the dense and strong structure of the concrete with intense closed porosity at the same time.

The developed conrete is classified as material for construction with high operational properties. It can be used for building of multi-storey and high-rise buildings, railway and automobile bridges, overpasses, junction, manufacturing of big-span reinforced concrete products (girders, beams, crossbars, etc.) and other special difficult building objects.

Application of the high-strength lightweight concrete for construction allows:

  • reduce the weight of the building and increase the maximum number of floors (up to 40%) due to low average density of concretes;
  • reduce the requirements for the grounds and foundations and reduce the total cost of works at "zero cycle" 2-2.5 times;
  • reduce the consumption of materials due to economy of concrete and metal reinforcement;
  • improve the energy efficiency of the building during its operation (energy saving in heating);
  • reduce the cost of transport and installation works in building process due to using the less lifting equipments;
  • reduce the cost of one square meter of housing in high-rise building at 30%.

    Total efficiency of construction is increased at 30-35% due to application of high-strength lightweight concrete!

The composition and expense components of HSLWC are selected to ensure high strength of dispersed phase and dispersed medium and also high adhesion of the phase boundary. The main component for decreasing the average density is hollow glass and/or alumina-silicate microspheres. The frame-forming part contains four components different dispersion that allows to get high dense packing ofparticles, fillpores and achieve strong structure. The special bicomponent modifier grafted to the surface of the microspheres intensifies cement hydration and increases adhesion of the cement-mineral matrix to the particles of hollow filler.

The main properties of high-strength lightweight concrete

Table 1

Propertiy

Unit

Value

Mobility (diameterspreading out of cone)

mm

more than 155

Average density

kg/m3 (lb/gal)

1300-1500 (10.8-12.5)

Total porosity

including closed

opened

%

to 33,4

31,9

1,50

Compressive strength

MPa

40.0-70.0

Flexural strength

MPa

5.0-8.5

Specific strength

MPa

30.0-50.0

Crack resistance

0.10-0.12

Crack resistance (MIIT method)

0.27-0.42

Modulus of elasticity

GPa

more than 10.0

Poisson's ratio

more than 0.10

Water absoption by weight

%

less than 1.0

Heat-conduction coefficient

W/(m∙K)

less than 0.60

Temperature conductivity coefficient

10-7 m2/s

less than 4.00

Specific heat capasity (T=25oC)

kJ/(kg∙K)

1.08-1.17

Water resistance

more than 0.99

Freeze-thaw resistance

more than F300

Advantages of high-strength lightweight concretes

Concrete was and is main structural material for building of housing. The developed high-strength lightweight concrete has positive qualities and advantages in relation to traditional lightweight and heavy concretes (table 2). The low average density (almost 2 times) is the most important feature of HSLWC that is distinctive aspect from heavy concrete. Moreover the such concrete has high compressive strength (B30-B55) and high heat-conduction and temperature conductivity coefficients (more than 2.5 times).

The high-strength lightweight concrete combines high strength, low water adsorption and high freeze-thaw resistance in contrast tolightweight concretes. Homogeneous strong structure of HSLWC provides a mark of frost-resistance more than F300 (where total porosity is 33.4%) that is unattainable for traditional cellular concretes. Today the heavy and lightweight kinds of concretes are combined in building for structural and thermal-insulation functions. And properties of HSLWC allows to combine these functions in one material.

Table 2

Indicator

High-strength heavy concrete

Traditional lightweight concrete

High-strength lightweight concrete

High strength

+

+

Low density

+

+

High specific strength

+

+

Closed porosity

+

+

Low water absorption

+

+

Low heat conductivity

+

+

Low sound conductivity

+

+

High frost resistance

+

+

Note: "+" is material has specified property; "–" is material has not specified property.

World analogues in the indicated direction

Developed composition of concrete exceed at 15-40% as compared with foreign analogues.

Table 3

Year

Country

Compressive strength, MPa

Average density, kg/m3

Specific strength, MPa

1999

 quwait Kuwait

22-25

1520-1550

14.4-15.0

2002

 germany

Germany

14-25

1800-1850

7.5-15.0

2003

 brazil

Brasil

40-50

1450-1600

24.5-30.5

2003

 turkey

Turkey

30-40

1800-1860

16.1-22.2

2004

 japan

Japan

47-54

1800-1850

27.5-30.0

2007

 russia

Russia

46-61

1800-1850

25.5-33.8

2007

 russia

Russia

42-48

1600-1650

25.4-28.7

2010

 malasia

Malaysia

43-48

1870-1990

22.9-24.1

2011

 turkey

Turkey

42-60

1840-1960

22.8-30.6

2012

 portugal

Portugal

40-70

1500-2000

22.8-35.0

2012

 russia HSLWC

40-70

1300-1500

30.0-50.0

Sphere of application of high-strength lightweight concrete

The energy-efficiency high-strength lightweight concretes can be used during the production of reinforced concrete

  • for the industrial and civil construction of multi-storeyandhigh-rise residentialand public buildings,
  • for the construction of automobile and rail bridges, overpassesandflyovers,
  • for the manufactureof big-span reinforced concrete products (girders, beams, crossbars, etc.),
  • other special difficult building objects.
Weight reduction of the elements in building construction allows to create difficult architectural idea and expand the sphere of application oflightweight concreteasa structural material.

An additional feature is the possibility of applying the such concrete for construction

  • in difficult ground conditions (shorelineof rivers, lakes, seas),
  • in areas with developedunderground communications (metro, tube, underground, tunnels),
  • in seismicallyunstable regions.
It makes possible to use the HSLWC for the construction in big and large-populated towns, in thetourist areas(hotels, inns), etc.

Moreover, the application of HSLWC can be actual in other direction where it exposes to high requirements of operational properties for concrete or exists limit weight of products. For example, the production of warm facades, balconies, special material-storage with spherical shape, etc.

Technological scheme for plant of reinforced concrete products

Technological scheme for plant of reinforced concrete products

Materials and composition (recipe) of high-strength lightweight concrete

The high-strength lightweight concrete is made of concrete mixture of special composition. It consists of cement, filler (microsphere) desired size, quartz sand, plasticizer and water. The mandatory part is mineral components included siliceous modifiers defined composition and granulometry. The effective plasticizers for these mixtures are polycarboxylate additives. HSLWC does not include a coarse aggregate. The special composition of HSLWC allows to provide the forming of dense and strength structure together with saturated closed porosity.

The cement CEM-I 42.5 N is used for preparation of developed concrete. The mineral part permorms the function of the packing to increase the density of concrete. Quartz sand has fraction 0.16-0.63 mm. The application of polycarboxylate additives (Sika, Melflux, Odolit-T and other) allows to increase the mobility and decrease the water demand of the concrete mixture. 

The important component for HSLWC with special operational properties is unique nanosized modifier which is developed in sientific center "Nanomaterials and nanotecnology" (MSUCE) and is used for modification of the surface of filler parts. It interacts with cement and hydration products to increase the adhesion of contact zone of the spherical parts and frame-forming components of HSLWC.

The quality of HSLWC products depends of prescription and tecnological factors: preparation and laying modes, mode of heat and humidity treatment and other.

Navigation menu

Relevance

For example: The urban population in RussiaFor example: The urban population in Russia
Strength concrete for high-risesStrength concrete for high-rises
Perspectives of HSLWCPerspectives of High-strength lightweight concrete

Industrial experience

Industrial experience of production of the High-strength lightweight concrete
Industrial experience of production of the High-strength lightweight concrete
Industrial experience of production of the High-strength lightweight concrete
Industrial experience of production of the High-strength lightweight concrete
Industrial experience of production of the High-strength lightweight concrete

Patent

Patent RU №2515450 - High-strength lightweight concrete

Sphere of application

Высокопрочный легкий бетон применяется в высотном строительствеHigh-rise construction
Высокопрочный легкий бетон применяется в многоэтажном строительствеMultistory building
Высокопрочный легкий бетон применяется в строительстве мостовBuilding of bridges
Высокопрочный легкий бетон применяется в строительстве дорожных развязокBuilding of interchanges and overpasses
Высокопрочный легкий бетон применяется в строительстве объектов энергетикиSpecial building (NPP)
Высокопрочный легкий бетон применяется в строительстве сферических хранилищSpherical storage
Высокопрочный легкий бетон применяется в строительстве полносборных трансформаторовPrefabrication transformers
Высокопрочный легкий бетон применяется при устройстве теплых фасадовWarm facades

Scientific publications

Some result of scientific research is published in journales which are included in RIC, Scopus and WoS:

  1. Some Aspects of Mixture Design for Multicomponent Composites // «Nanobuild: Research Internet Journal», 2011.
  2. Economic Prerequisites for Applications of High-Strength Lightweight Concrete // Journal «Scientific and technical Journal Povoljie», 2012.
  3. Strength of Nanomodified High-Strength Lightweight Concretes // «Nanobuild: Research Internet Journal», 2013.
  4. Peculiar Rheological Properties of High-Strength Lightweight Concretes Having Hollow Microspheres // Journal «Journal MGSU», 2013.
  5. Preparation and Research of High-Strength Lightweight Concrete by Hollow Microspheres // International journal «Advanced Materials Research», 2013.
  6. Hollow Micro-Spheres is an Efficient Filler for High-Strength Lightweight Concrete // Journal «Industrial and Civil Construction», 2013.
  7. Structuring and Properties of the Structural High-Strength Lightweight Concretes with Nanomodifier BisNanoActivus // «Building materials», 2014.
  8. Average Density and Porosity of High-Strength Lightweight Concrete // «Civil Engineering Journal», 2014.

  9. The materials was presented at conferences, seminars and exhibitions:
  10. International scientific and practical conference "Scientific and Technical Creativity of Youth - the way to a society based on knowledge", 2013, 2014.
  11. International Youth Conference "Risk assessment and safety in construction. New quality and reliability of materials and structures based on high technology ", 2012.
  12. National conference "Stability, safety and energy and resource saving in modern architectural, structural, technological solutions and engineering systems of buildings and structures", 2012.
  13. International Conference of Students, graduate students and young scientists "Theory and Practice of the effectiveness of building materials", 2012.
  14. International scientific and practical conference "Education and Science of the XXI Century - 2012", 2012.
  15. International scientific and practical conference "Science and education in modern society", 2012.
  16. International extramural scientific-practical conference "Education and Science: Current State and Prospects of Development", 2013.
  17. International scientific and practical conference "Modern scientific achievements - 2013", 2013.
  18. International Inter-University Scientific Conference of Young Scientists, graduate and doctoral students "Construction - formation of the living environment", 2013.
  19. International interuniversity scientific conference of students, undergraduates, graduate students and young scientists, 2013.
  20. International seminar-contest of young scientists and graduate students working in the field of binders, concrete and dry mixes, 2014.
  21. International scientific and practical conference "Science and Technology: A Step into the Future", 2014.
  22. International extramural scientific-practical conference "Science, Education, Society: Problems and Prospects", 2014.
  23. International Conference on concrete and reinforced concrete, 2014.

Protection of the rights

All information from this website is only for familiarization. These does not can to use without written consent by authors. Intellectual property is protected by a patent for an invention RU №2515450 C1 High-strength lightweight concrete (MPK C04B28/00, C04B111/20) from 11.10.2012. Copyright is FGBOU VPO Moscow State University of Civil Engineering.

S5 Box

Login

Register

*
*
*
*
*
*

Fields marked with an asterisk (*) are required.