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An early-strength and slow-setting type high pier-column machine-made sand concrete and its preparation method

A machine-made sand and concrete technology, applied in the field of concrete, can solve the problems that concrete retardation and early strength cannot be guaranteed at the same time, high stone powder content, high mud content, etc., to achieve long setting time, prolong setting time, and ensure early strength Effect

Active Publication Date: 2019-08-23
中建西部建设贵州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to design a kind of early-strength and retarded high pier column machine-made sand concrete and its preparation method to solve the problem that the prior art concrete retardation and early strength cannot be guaranteed at the same time, to solve the problem of machine-made sand due to Excessive stone powder content and high mud content affect the working performance of concrete

Method used

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  • An early-strength and slow-setting type high pier-column machine-made sand concrete and its preparation method
  • An early-strength and slow-setting type high pier-column machine-made sand concrete and its preparation method
  • An early-strength and slow-setting type high pier-column machine-made sand concrete and its preparation method

Examples

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Effect test

Embodiment 1-8

[0023] An early-strength and retarded-setting type high pier-column machine-made sand concrete, which is composed of cement, mineral admixture, sand, stone, composite admixture, modified active fiber and water and other raw materials. The mass parts of each component are shown in the table 1.

[0024] The mass parts of each component of table 1

[0025]

[0026]

[0027] The cement is P.II 42.5R cement, SO 3 = 2.84%, MgO = 2.06%, cement fineness = 3.42%, loss on ignition ≤ 0.28%, initial setting time = 80min, final setting time = 140min, 3d compressive strength = 24.1MPa, 28d compressive strength = 45.8MPa .

[0028] The mineral admixture is mineral powder, SiO 2 、Al 2 o 3 And the total content of CaO is 87.1%, and the specific surface area is 440m 2 / kg.

[0029] The machine-made sand is crushed from natural rock ore, with stone powder content ≤ 10%, MB value = 0.8%, and fineness modulus: 2.9.

[0030] The crushed stones are natural rock ore crushed stones, the ...

Embodiment 9-11

[0044] An early-strength and slow-setting type high pier-column machine-made sand concrete, which is composed of cement, mineral admixture, sand, stone, composite admixture, modified active fiber and water and other raw materials, cement, mineral admixture, sand, Stone and water carry out batching by table 1 embodiment 2. Embodiment 9 is compared with Example 2, no modified active fiber is added, and the composite admixture is the same as Example 2; Embodiment 10 is compared with Example 2, and the composite admixture that is added does not contain Meishan New Materials. Adhesive and mud-repelling agent, solid content and water reducing rate are constant, modified active fiber is the same as Example 2; Compared with Example 2 in Example 11, no modified active fiber is added, and the compound admixture added Meishan Xincai viscosity reducer and mud inhibitor are not included in the formula, and the solid content and water reducing rate remain unchanged. The index and preparati...

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Abstract

The invention discloses early-strength setting-retarding high pier stud machine-made sand concrete and a preparation method thereof. The concrete is composed of, by mass, 450-550 parts of cement, 50-100 parts of mineral admixture, 827-891 parts of machine-made sand, 896-965 parts of gravel, 2.25-8.25 parts of admixture, 2.25-27.5 parts of modified active fiber and 144-176 parts of water. An early-strength setting-retarding function of the composite admixture and early-strength anticracking performance of the modified active fiber are utilized fully, so that the concrete has the advantages of long setting time, high early strength, good anticracking performance and excellent durability, the problem that artificial sand is increasingly in shortage is solved by utilizing the machine-made sand, and the problem of contradiction between ensuring early strength and controlling setting time in the prior art is solved.

Description

technical field [0001] The invention relates to an early-strength and slow-setting type high pier-column machine-made sand concrete and a preparation method thereof, belonging to the technical field of concrete. Background technique [0002] With the advancement of infrastructure construction, expressways and urban interchanges have developed rapidly, and large-volume reinforced concrete structures have been widely used. The pier column is an indispensable and important part of the bridge structure, and its quality is related to the safety of the overall structure. As a typical mass concrete, high piers often face problems such as insufficient early strength, early cracks and poor durability. According to the relevant theory of concrete hydration, the above problems can be solved by controlling the temperature rise, reducing the heat of hydration, and increasing the setting time of concrete. However, the setting time of concrete is too long and the early strength of concre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/14C04B14/38
CPCC04B14/383C04B18/141C04B28/04C04B2201/05C04B2201/50C04B14/02C04B24/24C04B2103/0068C04B2103/22C04B22/002Y02W30/91
Inventor 何德军林喜华周涛张广智袁义进柯旭何欣赵士豪班录江孙庆云
Owner 中建西部建设贵州有限公司
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