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Grading method of ultra-high performance concrete

An ultra-high performance, concrete technology, used in the field of concrete test research

Pending Publication Date: 2022-01-11
中国水利水电第三工程局有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims at the problems existing in the prior art, and provides a method for grading ultra-high performance concrete, which uses alcohol instead of water to mix the cementitious materials, and overcomes the problem of fine particle aggregation in the dry accumulation measurement method , the consistency-dependent problem of the minimum water demand method, and also overcomes the hydration problem of the gelling material in the wet bulk density method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0036] Under the same match, use different fine limestone powder for further description of the invention, the parameters of the limestone powder using limestone powder are shown in Table 1:

[0037] Table 1 Process parameters and physical performance indicators for stone powder production

[0038]

[0039] Example 1 Table 2 ratio using micro-fed:

[0040] Table 2

[0041]

[0042] Note: The above ratios are the ratio of volume.

[0043] For the first time, it is recommended to select the initial anhydrous ethanol and gelling material to be selected for the proportion of the initial anhydrous ethanol and the gelling material. Subsegrade is gradually reduced to the solid concentration, or the mixture cannot be Become a paste.

[0044] Before experimenting, the density of the gelling material was measured to determine the specific amount of the gelling material, the measurement of the density of the gelling material was detected by GB / T 208-2014 cement density assay. Table 3 i...

Embodiment 2

[0083] In order to verify the effectiveness of the method of the present invention, a three sets of micro-levels are mixed with UHPC, and the UHPc having a better UHPc is mixed with a 0.2 hydrophone ratio, Table 10 is used in the example. UHPC coordination ratio.

[0084] Table 10

[0085]

[0086]

[0087] The sand used in this example is the river sand of the fine mode 2.5, the mud is less than 0.5; the steel fiber used is a copper-plated steel fiber having a length of 12 mm, and the water reduction agent is a polycarboxylic acid having more than 30% reduction efficiency. High efficiency water reduction.

[0088] In accordance with Table 10, the quality of material required is calculated, in the laboratory, in accordance with the mass quality of the calculation material, weigh the balance accuracy of ± 1g at the time of weighing.

[0089] The mixture was stirred using a cement rubber mixer, and all gelation materials and sand were first stirred at a mixing pan, stirring the ...

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Abstract

The invention discloses a grading method of ultra-high performance concrete. The grading method comprises the following steps: respectively weighing a required amount of absolute ethyl alcohol and a required amount of a cementing material; adding a cementing material and absolute ethyl alcohol into a stirrer, stirring until the cementing material is in a wet and nucleation state, and then adjusting the stirrer to a high-speed running state for stirring to obtain a pasty stirred material; transferring the pasty stirred material into a cylindrical mold, filling the mold until the mold is excessive, removing the redundant part, weighing the amount of the pasty material in the mold, and calculating to obtain the solid concentration; and repeating the steps at a continuously lower volume ratio of the absolute ethyl alcohol V to the cementing material V until the maximum solid concentration, namely the filler density, is found. According to the invention, anhydrous ethanol is used for mixing a cement-based cementing material, the anhydrous ethanol, the cement, silica fume, slag powder and limestone powder are not subjected to hydration reaction during mixing, the cementing material particles are completely piled in an original state, and hydration interference is eliminated.

Description

Technical field [0001] The present invention belongs to the technical field of concrete test, and in particular, to a level method of ultra-high performance concrete. Background technique [0002] UHPC is ultra-high performance concrete, the most innovative material in the current cement-based engineering materials, which is known for its superior durability and ultra high mechanical properties, currently widely used in cross-sea bridges, architectural decoration UHPC, UHPC is designed based on maximum bulk density theory, UHPC is designed to form a tightly stacked, ie, millimeter granules (aggregate) accumulated by different particles (aggregates). Micron-grade particles fill, micron particle deposited gaps filled with submicron granules. [0003] The current evaluation of micro-assigned methods has the following three types: dry reactor measurement method, minimum water supply method and wet stack density method (maximum solid phase content). [0004] Dry accumulation can be di...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/146C04B18/141C04B14/28C04B24/026C04B14/48C04B14/06C04B2103/302
Inventor 马强强陈晨王亚萍孔海峡宋金平罗伟
Owner 中国水利水电第三工程局有限公司
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