High thixotropic fast hardening self-compacting concrete for CRTS III type slab track skylight construction and preparation method
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A technology of self-compacting concrete and slab track, which is applied in the direction of track, track maintenance, track laying, etc., can solve problems such as insufficient stability, and achieve the effect of improving convenience, improving thixotropy, and obtaining raw materials easily
Active Publication Date: 2019-11-08
CENT SOUTH UNIV +2
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[0007] The purpose of the present invention is to provide a kind of high thixotropic rapid hardening self-compacting concrete and preparation m
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Embodiment 1
[0038] A kind of high thixotropic rapid-hardening self-compacting concrete used for the construction of CRTS III type slab track skylight, calculated as one cubic concrete, the weight ratio of each component is:
[0039] 115 parts of rapid hardening sulfoaluminate cement
[0040] Portland cement 20 parts
[0041] 12 parts of fly ash
[0042] 20 parts of plaster
[0043] Sand 220 parts
[0044] Stone 210 parts
[0045] 42 parts of water
[0046] Powder water reducer 1.6 parts
[0047] 5 parts of thixotropic viscosity modifier, wherein the mass fraction of inorganic thixotropic viscosity modifier is 93%, which is composed of equal mass mixture of diatom shale powder and feldspar powder, the mass fraction of organic viscosity modifier is 2%, and the composition is Wenlun Glue, the mass fraction of an organic polymer thixotropic agent is 5%, and the composition is a mass mixture of polyacrylic acid and polymethacrylic acid;
[0048] 0.1 part of hardening accelerator, wherei...
Embodiment 2
[0059] A rapid-hardening self-compacting concrete used for the construction of CRTS III slab track skylights, calculated as one cubic concrete, the weight ratio of each component is:
[0060] 100 parts of rapid hardening sulfoaluminate cement
[0061] Portland cement 25 parts
[0062] 10 parts of fly ash
[0063] 20 parts of plaster
[0064] Sand 200 parts
[0065] Stone 195 parts
[0066] 40 parts of water
[0067] 1.5 parts of powder water reducer
[0068] 6 parts of thixotropic viscosity modifier, of which the mass fraction of inorganic thixotropic viscosity modifier is 95%, which is composed of attapulgite clay and rutile powder and other mass mixtures, the mass fraction of organic viscosity modifier is 2%, and the composition is hydroxypropyl Methyl cellulose, the mass fraction of organic polymer thixotropic agent is 3%, and the composition is a mass mixture such as polyoxyethylene and polyvinyl alcohol;
[0069] 0.1 part of hardening accelerator, wherein the main ...
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Abstract
The invention discloses a high thixotropic fast hardening self-compacting concrete for CRTS III type slab track skylight construction and a preparation method. The concrete mainly comprises the following components: cementitious materials, sand, stone, water and chemical admixtures. The preparation process includes: blending fast hardening sulphoaluminate cement, Portland cement, fly ash, gypsum,sand, a powder water reducer, a thixotropic viscosity modifier and a hardening accelerator into dry powder, and conducting mixing with water and stone on site through simple mixing equipment. The highthixotropic fast hardening self-compacting concrete can meet the technical indexes of CRTS III type slab track self-compacting concrete and the requirements of skylight construction, the compound useof the thixotropic viscosity modifier and the hardening accelerator endows self-compacting concrete with high self-compacting concrete, after being poured into a sealed membrane cavity, the concretehas rapidly increased viscosity under a standing state, and improved aggregate and bubble stability, and reduces the occurrence of aggregate settlement and bubble floatation, the concrete uniformity is improved, and a pouring molded track structure concrete filling layer and a track slab have good bonding quality.
Description
technical field [0001] The invention relates to the field of concrete materials, in particular to a highly thixotropic rapid-hardening self-compacting concrete used in the construction of CRTS III type slab track skylights and a preparation method. Background technique [0002] The CRTS III track structure is a track structure type with independent intellectual property rights in my country. It has made systematic innovations in design theory, structural design, engineering materials, construction technology, etc., and has been applied in many passenger dedicated lines. The main track structure type used in line construction. [0003] The main structural features of the track structure are as follows: (1) The prefabricated track slab and the cast-in-place self-compacting concrete layer form a "composite slab" structure, and the composite slab should keep working together for a long time. The composite slab structure is the basic feature of the CRTS III slab structure. (2) Al...
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