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Microexpanded ultrahigh-performance concrete and preparation method

An ultra-high-performance, micro-expansion technology, which is applied in the field of highway bridge engineering and building materials, can solve the problems that the technical performance cannot fully meet its needs, the construction difficulty of ultra-high-performance concrete, and the shrinkage of ultra-high-performance concrete are large. No-steam curing construction, good construction performance, and improved flow performance

Active Publication Date: 2019-01-15
宁波市高等级公路建设指挥部 +1
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AI Technical Summary

Problems solved by technology

[0003] The technical performance of ordinary high-performance concrete (compressive strength ≤ 60MPa, tensile strength ≤ 5MPa) can no longer fully meet its needs, so it is necessary to develop an ultra-high performance concrete material (compressive strength ≥ 150MPa, tensile strength ≥ 25MPa) To meet the aforementioned engineering technical needs
Although the current ultra-high performance concrete has been demonstrated and applied in engineering, there is still a long way to go before large-scale promotion. It mainly has the following problems: 1) ultra-high performance concrete shrinks greatly and is easy to crack; 2 ) The construction of ultra-high performance concrete is difficult, and its components are not easy to disperse; 3) The cost of materials is too high, and the cost of engineering projects is greatly increased

Method used

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  • Microexpanded ultrahigh-performance concrete and preparation method

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preparation example Construction

[0027] The preparation method of micro-expansion ultra-high performance concrete comprises the following steps:

[0028] 1) According to the weight ratio of the raw material components, weigh the corresponding parts by weight of Portland cement, mineral admixture, silica fume, volume stabilizer, quartz sand, steel fiber, high-dispersion and low-viscosity water reducer and water ,spare. The raw materials are equipped as follows:

[0029] Portland cement is P.Ⅱ type Portland cement produced by Hubei Yadong Cement Co., Ltd., with a strength grade of 52.5 and a specific surface area of ​​435m 2 / kg, standard thick water requirement 29.8%, initial setting time 125min, final setting time 184min, 3d compressive strength and flexural strength were 32.0MPa and 5.6MPa, 28d compressive strength and flexural strength were 60.1MPa and 10.8 MPa.

[0030] The mineral admixture is compounded by fly ash, floating beads and finely ground limestone powder. The weight ratio is: fly ash: floati...

Embodiment 1~3 and comparative example 1~3

[0043] Examples 1-3 are micro-expansion ultra-high performance concrete prepared by using the raw materials and their corresponding component ratios and preparation methods described in the present invention. Comparative Example 1 uses the above-mentioned raw materials and preparation methods, but not prepared according to the ratio of the present invention The ultra-high performance concrete that forms, embodiment 1~3 and comparative example 1 are as shown in table 2 for each raw material component weight ratio ratio:

[0044] Table 2

[0045]

[0046] Comparative examples 2 to 3 are ultra-high performance concrete prepared by using conventional admixture fly ash (National Standard Class I fly ash) and ettringite and other materials. The weight ratio of each raw material component is shown in Table 3:

[0047] table 3

[0048]

[0049] The main performance parameters of the ultra-high performance concrete that each embodiment 1~3 and comparative examples 1~3 make in ta...

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Abstract

The invention discloses micro-expanded ultrahigh-performance concrete and a preparation method. The concrete is prepared from the following ingredients in parts by weight: 100 parts of Portland cement, 10 to 55 parts of mineral additives, 20 to 60 parts of silicon ash, 10 to 35 parts of volume stabilizers, 150 to 250 parts of quartz sand, 15 to 40 parts of steel fiber, 2.0 to 5.0 parts of high dispersion and low viscosity type water reducers and 30 to 45 parts of water. The micro-expanded ultrahigh-performance concrete replaces a negative bending moment region conventional mechanical tensioning prestress structure to form a non-prestress simple support rotation continuous system; the self-bearing force, interface bonding, micro-expanded expansion performance and durability requirements canbe met; the construction efficiency of the non-prestress simple support rotation continuous system bridge is effectively improved. The concrete has the ultrahigh pressure-resistant and tension-resistant intensity, ultrahigh durability, micro expansion performance, steam curing avoidance, bonding performance and reasonable economic performance; meanwhile, good construction performance is realized.

Description

technical field [0001] The invention relates to the field of highway bridge engineering and building materials, in particular to a micro-expansion ultra-high performance concrete and a preparation method thereof. Background technique [0002] Usually, in the bridge structure with a basic span of 30m and then simply supported and then continuously prefabricated T-beam construction, the continuous beam is formed by setting the cast-in-place section on the top of the pier and tensioning the negative moment steel tendon by mechanical tensioning. Prestressing is used to resist the tensile stress on the upper edge of the negative moment zone at the top of the pier, preventing concrete from cracking or reducing the crack width. However, this method requires high technology, equipment, personnel and management, and the construction is relatively cumbersome, which increases the workload and difficulty of construction, and affects the scheduled use of the bridge. Therefore, if a kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/08C04B18/082C04B14/28C04B18/146C04B2103/0068C04B2103/10C04B14/06C04B14/48C04B2103/302
Inventor 刘慈军徐文冰周玉娟陈涛余以明李顺凯王全超黄玉良明阳
Owner 宁波市高等级公路建设指挥部
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