EP3442924A1 - Use of treated desert sand as an aggregate for concrete - Google Patents
Use of treated desert sand as an aggregate for concreteInfo
- Publication number
- EP3442924A1 EP3442924A1 EP17716847.3A EP17716847A EP3442924A1 EP 3442924 A1 EP3442924 A1 EP 3442924A1 EP 17716847 A EP17716847 A EP 17716847A EP 3442924 A1 EP3442924 A1 EP 3442924A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sand
- concrete
- desert sand
- aggregate
- stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
Definitions
- the invention relates to the use of treated desert sand as an aggregate for concrete.
- the aggregate forms a filler which does not affect the strength of the concrete and which is bound by the binder of ground cement clinker, concrete admixtures and concrete admixtures.
- the concrete additives influence the setting behavior of the concrete and its rheological properties.
- the concrete admixtures are chemically active in the setting concrete, such as water.
- sand Although most types of sand that are used as aggregates are mostly quartz-quar- tered, different types of sand also contain car- bonate-containing rocks, for example, when the sand is beach sand or grainy or basaltic rocks when the sand from Gravel pits dates. The sand provenance thus determines its chemical composition, the particle size distribution and also the grain shape.
- the worldwide demand for construction land is large. Sand is the economic commodity in third place in world consumption. The worldwide demand for sand per year is about 15 billion tons.
- the scarce reserves of sand suitable as a concrete additive mean that building sand is meanwhile obtained by ships from the sea. For this purpose, the suitable sand is transported by ship over long sea distances.
- desert sand especially when mined as surface sand or as dune sand, has a round to spherical sand form.
- the grain shape is created by rolling the sand over millions of years within the desert, with the individual grains being ground round.
- beach sand which is repeatedly circulated by the surf, has a round shape of the individual grains of sand.
- Desert sand as such is therefore not suitable for use as a concrete aggregate for concrete applications requiring particularly strong concrete.
- a geologically young break sand is usually required, which is usually obtained from rivers, where the sand is removed from moraines. It may thus be necessary to transport sand at great expense in sandy desert regions in order to use it there as a building sand.
- the object of the invention is therefore to develop a method by which desert sand can be used as an aggregate for concrete.
- the object according to the invention is achieved in that the desert sand has previously been crushed in a high-pressure roller press in which the desert sand is crushed in a bed in a bed by compressive stress and agglomerated and then in a second stage the agglomerates are destroyed by a further mechanical stress, wherein the compressive stress in the first stage is effected by a single pressure between two surfaces with over 50 MPa pressure.
- desert sand having a substantially round grain shape is provided by a high-pressure roller press, as described by Schonert et al. has been published for the first time in German Offenlegungsschrift DE 27 08 053 and the disclosure of which is incorporated in this application.
- the desert sand is fractured, forming a fissured and irregular grain shape that is roughly comparable to the irregularity of rock split commonly used for road construction in Europe.
- this desert sand thus treated suddenly tends to agglomerate, forming flakes which, in a second stage, are destroyed by further mechanical stress.
- air classifiers are suitable, in which the slightly disintegrating slugs fall over jalousie-like arranged sheets and thereby break up and free the treated desert sand from its agglomeration.
- the broken desert sand is detected by a corresponding air separation process from the grinding circuit, if it is a high-pressure roller press in a circular mill or the desert sand is broken by a single pass through the high-pressure roller press with Schülpendesagglomerator.
- sand obtained has the property of forming a steeper angle of slope in a bed than the round-grained desert sand has.
- the sand of sand treated by a high-pressure roller press differs from a grinding in the muller or a vertical mill.
- the formation of the steeper slope angle is due to the fact that, according to Schönert et al. high pressure treated sand a grain has shape, which leads to a mutual wedging of the individual grains of sand in the bed. It is assumed here that the same geometric properties of the crushed sand by a high-pressure treatment lead to the concrete strength of freshly broken desert sand is higher than other natural sands.
- the high-pressure treatment according to Schönert et al. treated desert sand of provenance Dubai, Oman, United Arab Emirates and Saudi Arabia, but also Morocco proved particularly suitable.
- the 7-day strength, 40-day strength and 100-day strength of a high-pressure treated sand of 50 MPa proved sufficient for use in the construction of high-rise buildings, bridges and underwater foundations.
- the criteria of concrete strength are specified in the corresponding standards, such as DIN 1045, DIN 1992.
- the formulations for the respective desired concrete, in particular the particle size distributions of the sand to be used, are also specified in the relevant concrete manuals.
- the given grain size and grain size distribution can be at the preparation of the crushed by the high-pressure treatment sand by known means such as sifting and mixing can be adjusted.
- the sand is conveyed back pneumatically or via a mechanical conveyor after passage of the roller press back again and again abandoned the roller press.
- the circulating sand as regrind is spotted by a static or a dynamic sifter, such as a rod sifter.
- the fine material leaves the circulating grinding plant and the grits as coarse material of the classifier are recirculated.
- the crushed desert sand is adjusted to the desired particle size distribution by sieving, which can also be done in the aforementioned circulation.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016004349 | 2016-04-11 | ||
DE102017102225.2A DE102017102225B3 (en) | 2016-04-11 | 2017-02-06 | Use of treated desert sand as aggregate for concrete, process for its production and desert sand as aggregate |
PCT/EP2017/058375 WO2017178362A1 (en) | 2016-04-11 | 2017-04-07 | Use of treated desert sand as an aggregate for concrete |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3442924A1 true EP3442924A1 (en) | 2019-02-20 |
Family
ID=59650891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17716847.3A Withdrawn EP3442924A1 (en) | 2016-04-11 | 2017-04-07 | Use of treated desert sand as an aggregate for concrete |
Country Status (7)
Country | Link |
---|---|
US (1) | US20190177221A1 (en) |
EP (1) | EP3442924A1 (en) |
CN (1) | CN109071341A (en) |
DE (1) | DE102017102225B3 (en) |
MA (1) | MA43470B1 (en) |
MX (1) | MX2018012352A (en) |
WO (1) | WO2017178362A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018120331B3 (en) * | 2018-08-21 | 2019-02-28 | Khd Humboldt Wedag Gmbh | Aggregate for concrete and use of concrete recyclate as aggregate for concrete |
CN111375546B (en) * | 2020-03-20 | 2021-09-03 | 重庆广播电视大学重庆工商职业学院 | Sand and stone particle recycling and treating equipment for building and using method thereof |
CN112551968B (en) * | 2020-11-06 | 2022-01-04 | 浙江大学 | Desert sand-ferrochromium slag 3D printing concrete material and construction method thereof |
CN112358246B (en) * | 2020-11-20 | 2022-09-13 | 中铁二十局集团有限公司 | High-elevation pumping high-performance desert sand concrete and preparation method thereof |
DE102022102938A1 (en) | 2022-02-08 | 2023-08-10 | Dyckerhoff Gmbh | Concrete mix and method for its production, use of the concrete mix and method for the production of a concrete component |
CN114751687B (en) * | 2022-05-31 | 2022-09-30 | 河海大学 | Fiber composite modified desert sand reinforced cement mortar and preparation method thereof |
DE102022114264A1 (en) * | 2022-06-07 | 2023-12-07 | Tilman Fritsch | Process for producing an additive for a binder or a building material, additive for a binder or a building material and use of a mixture of slate and desert sand as an additive for a binder or a building material |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE748444C (en) * | 1942-11-19 | 1944-11-03 | Process for increasing the adhesion of cement to pressure-resistant, non-porous aggregate in concrete | |
DE2708053C3 (en) * | 1977-02-24 | 1986-05-07 | Schönert, Klaus, Prof. Dr.-Ing., 7500 Karlsruhe | Process for fine and ultra-fine comminution of materials with brittle behavior |
DE3248537C2 (en) * | 1982-12-29 | 1986-10-23 | Erich 8500 Nürnberg Rabe | Sintered molded bodies based on quartz sand and a method and device for their production |
SU1571029A1 (en) * | 1988-03-14 | 1990-06-15 | Центральный Научно-Исследовательский Институт Строительных Конструкций Им.В.А.Кучеренко | Raw mixture for manufacturing lightweight heat-resistant concrete |
US8293006B2 (en) * | 2009-09-01 | 2012-10-23 | King Saud University | Cement/aggregate composition, concrete product and method for making a concrete product |
CN101717215B (en) * | 2009-11-11 | 2011-11-09 | 天津大学 | Concrete aggregate produced by desert fine sands and production method thereof |
US9039830B2 (en) * | 2012-10-09 | 2015-05-26 | King Saud University | Cement composition containing dune sand and limestone powder, concrete products and method for making concrete products |
ES2718929T3 (en) * | 2014-05-10 | 2019-07-05 | Innovative Sand Gmbh | Procedure and device for producing artificial crushing sand, as well as crushed sand, through heat treatment by using sand in the form of fine sand and / or round sand as the starting material |
DE102014006942B3 (en) * | 2014-05-10 | 2015-07-16 | Dennis Behnisch | Process for the production of a sand suitable for the production of concrete or as bulk material for reclamation |
CN105036651A (en) * | 2015-07-24 | 2015-11-11 | 石河子大学 | Desert sand concrete |
-
2017
- 2017-02-06 DE DE102017102225.2A patent/DE102017102225B3/en not_active Expired - Fee Related
- 2017-04-07 MA MA43470A patent/MA43470B1/en unknown
- 2017-04-07 WO PCT/EP2017/058375 patent/WO2017178362A1/en active Application Filing
- 2017-04-07 MX MX2018012352A patent/MX2018012352A/en unknown
- 2017-04-07 US US16/092,930 patent/US20190177221A1/en not_active Abandoned
- 2017-04-07 EP EP17716847.3A patent/EP3442924A1/en not_active Withdrawn
- 2017-04-07 CN CN201780022983.0A patent/CN109071341A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN109071341A (en) | 2018-12-21 |
MX2018012352A (en) | 2019-02-11 |
US20190177221A1 (en) | 2019-06-13 |
WO2017178362A1 (en) | 2017-10-19 |
MA43470B1 (en) | 2020-10-28 |
DE102017102225B3 (en) | 2017-09-07 |
MA43470A1 (en) | 2020-03-31 |
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