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Ultra-high performance concrete with low water-binder ratio and preparation method thereof

A technology with ultra-high performance and water-binder ratio, applied in the field of concrete, can solve problems such as not being able to meet the requirements of use well, and achieve the effects of excellent resistance to chloride ion penetration, excellent mechanical properties, and high compactness

Inactive Publication Date: 2020-11-13
安徽精公检测检验中心有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

However, the compressive strength of ultra-high-performance concrete developed at present is about 120 MPa. In some special fields and prefabricated components, there are higher requirements for the strength and electric flux of ultra-high-performance concrete, requiring low water-binder ratio. Ultra-high strength, conventional ultra-high performance concrete can not meet the requirements of use

Method used

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  • Ultra-high performance concrete with low water-binder ratio and preparation method thereof

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preparation example Construction

[0022] The present invention also provides a method for preparing ultra-high performance concrete with a low water-binder ratio as described above, including:

[0023] 1) The polycarboxylate water reducer, defoamer and water are first mixed to obtain the admixture;

[0024] 2) secondly mixing cement, silica fume, fly ash, mineral powder and sand to obtain a mixed powder, and then adding steel fibers under stirring to obtain a mixed material;

[0025] 3) The mixture, admixture and water are mixed for the third time to obtain ultra-high performance concrete with low water-binder ratio.

[0026] In the above-mentioned preparation method, the mode and time of the first mixing can be selected in a wide range, but in order to further improve the mechanical properties (crack resistance and compression resistance), fluidity and chloride ion penetration resistance of concrete, preferably , the first mixing is carried out by stirring, and the mixing time is 100-200s.

[0027] In the a...

Embodiment 1

[0039] 1) Weigh 152g of polycarboxylate superplasticizer-1, 0.3g of defoamer-1 and 152g of water, stir for 150s to obtain the admixture, and set aside;

[0040] 2) Weigh 4.52kg of PⅡ52.5 cement, 2.28kg of S140 mineral powder, 500g of silica fume-1, 298g of grade I fly ash, 7.6kg of natural quartz sand (average particle size is 1.0mm), 2.2kg of steel fiber (length 18mm, diameter 0.20mm), spare.

[0041] Add cement, mineral powder, silica fume, fly ash, and natural quartz sand into the mixing pot and stir for 120s, then add steel fibers while stirring. The feeding time of steel fibers is controlled at 60s. After the feeding is completed, continue stirring for 120s to obtain Mixture.

[0042] 3) Add 304.3g of admixture and 912g of water to the above mixture, and stir for 120s to prepare a concrete mixture.

[0043] 4) The concrete mixture prepared above was placed in a concrete mold by pouring, placed on a concrete vibrating table, vibrated for 120s, and finally placed in a sta...

Embodiment 2

[0045] According to the method of Example 1, the difference is that the polycarboxylate superplasticizer-1 is replaced by the polycarboxylate superplasticizer-2, the defoamer-1 is replaced by the defoamer-2, and the PⅡ52. 5 Replace cement with PO 52.5 cement, replace grade I fly ash with grade II fly ash, replace silica fume-1 with silica fume-2, replace natural quartz sand with artificial quartz sand, and replace S140 mineral powder with S120 slag powder, the average particle size of quartz sand is 0.08mm; the steel fiber meets the requirements: the length is 12mm, and the diameter is 0.22mm;

[0046] In steps 2) and 3), the weight ratio of cement, silica fume-2, fly ash, mineral powder, quartz sand, steel fiber, admixture and water is 500:50:20:250:900:250:30: 80, 1 part by weight corresponds to 8g; in step 1), the weight ratio of polycarboxylate superplasticizer-2, defoamer-2 and water is 30:0.07:40, 1 part by weight corresponds to 5g.

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Abstract

The invention discloses ultra-high performance concrete with a low water-binder ratio and a preparation method thereof. The ultra-high performance concrete with the low water-binder ratio contains cement, silica fume, fly ash, mineral powder, sand, steel fibers, additives and water which are independently stored or stored in a mixed mode, wherein the weight ratio of the cement to the silica fume to the coal ash to the mineral powder to the sand to the steel fibers to the admixture to the water is 500: (20-200): (20-70): (200-400): (600-1300): (150-400): (15-45): (18-120); the additive containsa polycarboxylate superplasticizer, a defoaming agent and water in a weight ratio of 30: (0.05-0.12): (30-60); the polycarboxylate superplasticizer at least meets the following conditions that the water reducing rate is not lower than 30%, and the solid content is not lower than 40%. The ultra-high performance concrete with the low water-binder ratio has excellent mechanical properties, fluidity,chloride ion penetration resistance and an ultra-low water binder ratio, and meanwhile, the preparation method has the advantages of being simple and convenient to operate and simple in process.

Description

technical field [0001] The invention relates to concrete, in particular to an ultra-high-performance concrete with a low water-binder ratio and a preparation method thereof. Background technique [0002] Ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), is a new type of cement-based structural material with excellent properties such as ultra-high strength, high durability, and high toughness. Ultra-high performance concrete has achieved a great leap forward in engineering materials, and it is also the most innovative cement-based engineering material in the past three decades. However, the compressive strength of ultra-high-performance concrete developed at present is about 120 MPa. In some special fields and prefabricated components, there are higher requirements for the strength and electric flux of ultra-high-performance concrete, requiring low water-binder ratio. Ultra-high strength, conventional ultra-high performance concrete can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B40/0039C04B2103/302C04B22/002C04B2103/50C04B18/141C04B18/146C04B18/08C04B14/06C04B14/48
Inventor 恽进进徐文祥王圣娜陈钦松肖慧丽轩红钟谢发权王一健黄爱斌傅婷卢海军张亚楠沈江平叶书峰王莹徐雪玲
Owner 安徽精公检测检验中心有限公司
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