Rheological evaluation method for internal phase stability of ultra-high performance concrete

A technology of ultra-high performance and evaluation method, which is applied in the direction of material inspection products, design optimization/simulation, etc., can solve the problems of high detection cost, irreversible damage of materials, long test cycle, etc., and achieve the effect of short evaluation cycle

Active Publication Date: 2022-07-01
JIANGSU SOBUTE NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the above-mentioned method has certain feasibility, its shortcomings and deficiencies are also obvious.
The cross-sectional image method needs to cut and polish the hardened test block, and its test period is long, and it will cause irreversible damage to the material; while non-destructive testing methods such as X-CT tomography, magnetic force method and terahertz electromagnetic wave method, although the test period Short and non-destructive, but the detection cost is extremely high and the operation is difficult

Method used

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  • Rheological evaluation method for internal phase stability of ultra-high performance concrete
  • Rheological evaluation method for internal phase stability of ultra-high performance concrete
  • Rheological evaluation method for internal phase stability of ultra-high performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] First, use Ultra high performance concrete premix (no sand) and Series of polycarboxylate superplasticizers, with and without additions In the case of the concrete thickener, two kinds of UHPC slurries were prepared; denoted as the first UHPC slurries and the second UHPC slurries, respectively.

[0053] Then, the internal structure recovery index and the structure recovery relaxation time of the first UHPC pure paste and the second UHPC pure paste are respectively determined by the evaluation method provided by the present invention.

[0054] Specifically, the measurement methods of the internal structure recovery index and the structure recovery relaxation time of the first UHPC pure pulp and the second UHPC pure pulp are as follows: (1) The UHPC pure pulp is loaded into the flat plate rotary rheometer. In the silo, "100s -1 Pre-shear - 1Pa constant shear stress - 100s -1 Pre-shear - 3Pa constant shear stress - 100s -1 Pre-shear - 5Pa constant shear stress - 10...

Embodiment 2

[0059] First, use Ultra-high performance concrete premix (no sand), ordinary river sand with particle size not exceeding 1.18mm, and Series of polycarboxylate superplasticizers, with and without additions In the case of the concrete thickener, two UHPC mortars were prepared; denoted as the first UHPC mortar and the second UHPC mortar, respectively.

[0060] Then, the internal structure recovery index and the structure recovery relaxation time of the first UHPC mortar and the second UHPC mortar are respectively determined by the evaluation method provided by the present invention.

[0061] Specifically, the method for measuring the internal structure recovery index and the structure recovery relaxation time of the first UHPC mortar and the second UHPC mortar adopts the following methods: (1) Load the UHPC mortar into the material cup of the coaxial cylindrical rheometer , using "50s -1 Pre-cut, 0s -1 -50s -1 -0s -1 The rheological test was carried out using the linear ...

Embodiment 3

[0066] First, use Ultra-high performance concrete premix (no sand), ordinary river sand with particle size not exceeding 1.18mm, and Series of polycarboxylate superplasticizers, with and without additions In the case of the concrete thickener, two UHPC mortars were prepared; denoted as the third UHPC mortar and the fourth UHPC mortar, respectively.

[0067] Then, the internal structure recovery index and the structure recovery relaxation time of the third UHPC mortar and the fourth UHPC mortar are respectively determined by the evaluation method provided by the present invention.

[0068] Specifically, the method for measuring the internal structure recovery index and the structure recovery relaxation time of the third UHPC mortar and the fourth UHPC mortar adopts the following methods: (1) Load the UHPC mortar into the material cup of the coaxial cylindrical rheometer , using "30s -1 Pre-cut, 0s -1 -30s -1 -0s -1 The rheological test was carried out using the “linear...

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Abstract

The invention belongs to the technical field of building material testing, and particularly discloses a rheological evaluation method for internal phase stability of ultra-high performance concrete. According to the method, the rheological property of the ultra-high performance concrete mixture containing no fiber and coarse aggregate is tested, simple and easily available rheological parameters such as yield stress, shear rate-time and the like are measured, and indexes such as an internal structure recovery index and relaxation time are fitted by using a theoretical model; the phase stability of the ultra-high performance concrete containing the fibers and the coarse aggregates can be evaluated. Compared with a current destructive method and a non-destructive method for evaluating phase distribution, the evaluation method has the advantages that the phase stable distribution degree of the hardened ultra-high performance concrete can be evaluated only through the rheological index of the early plastic stage, and the evaluation period is extremely short; the required yield stress and shear rate-time parameters are easy to measure, complex program processing is not needed, evaluation can be completed only through a single theoretical model, and compared with a traditional method, the method has incomparable advantages.

Description

technical field [0001] The invention belongs to the technical field of building material testing, and in particular relates to a rheological evaluation method for internal phase stability of ultra-high performance concrete. Background technique [0002] Ultra-high Performance Concrete (UHPC) is a cement-based composite material with extremely low water-to-binder ratio, close packing of multiple fine particles, and toughening of fine steel fibers. With the continuous development of technology and engineering needs, the introduction of coarse aggregate into the UHPC system can effectively reduce the amount of rubber material and inhibit shrinkage deformation, which is not only conducive to improving volume stability, but also improving mechanical properties such as elastic modulus to a certain extent. However, due to the low yield stress, high viscosity and large flow state of fresh UHPC due to the high superplasticizer dosage and the ease of construction, the density differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38G06F30/20
CPCG01N33/383G06F30/20Y02W30/91
Inventor 郑晓博刘加平刘建忠沙建芳韩方玉张堃宇张淑伟
Owner JIANGSU SOBUTE NEW MATERIALS
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