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Formula and low-cost design method of ultra-high performance concrete containing coarse aggregate

A technology with ultra-high performance and design methods, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as UHPC performance is too good, performance waste, promotion difficulties, etc., to achieve simple orientation, reduce Dosage, scientific guidance and strong effect

Active Publication Date: 2021-12-10
CHINA CONSTR THIRD BUREAU GREEN IND INVESTMENT CO LTD
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  • Application Information

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Problems solved by technology

It can be used to prepare multi-grade UHPC with relatively low cost but still has strong durability of UHPC, which solves the problems of difficult promotion and performance waste caused by the high performance and high cost of UHPC

Method used

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  • Formula and low-cost design method of ultra-high performance concrete containing coarse aggregate
  • Formula and low-cost design method of ultra-high performance concrete containing coarse aggregate

Examples

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Effect test

Embodiment 1

[0050] A low-cost design method for ultra-high performance concrete formulations containing coarse aggregate,

[0051] S1. Choose CaO content between 65%-70%, SiO 2 Between 20%-23%, Al 2 o 3 Cement with a content between 4-8% and a specific surface area ≥ 350; select a specific gravity of 2.6-2.7g / cm 3 of quartz sand.

[0052] S2. Pre-select the content of mineral powder, quartz sand and coarse aggregate, mineral powder 200kg / m 3 , Quartz sand 800kg / m 3 , Coarse aggregate 160kg / m 3 , select formulas composed of different aggregate sizes, and measure the porosity of the mixed aggregate composed of mineral powder, quartz sand and coarse aggregate at this content; figure 1 and 2 As shown, it is composed of two groups of aggregate sizes; in the figure, the dotted line is the optimal aggregate combination interval found through multiple experiments, and the solid line is an example of an aggregate combination. the test result indicates, figure 1 The porosity of the mixed a...

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Abstract

The invention provides a formula and a low-cost design method of ultra-high performance concrete containing coarse aggregate. According to the design method, the contents of mineral powder, quartz sand and coarse aggregate are preset according to raw material formula intervals, the porosity of a mixture of the mineral powder, the quartz sand and the coarse aggregate is measured, the content of a cementing material is gradually optimized on the basis of the porosity, and finally the low-cost ultra-high performance concrete formula with different grades of compressive strength is obtained. According to the invention, the optimal aggregate size interval is determined through the experiment, and the ultra-high performance concrete with excellent comprehensive performance can be obtained in the interval set by the invention. The method is simple in guidance and high in scientific guidance, can be used for preparing multi-grade UHPC which is relatively low in cost but still has high UHPC durability, and solves the problems of popularization difficulty and performance waste caused by the fact that UHPC is too good in performance and too high in cost.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to a formula of ultra-high-performance concrete containing coarse aggregate and a low-cost design method. Background technique [0002] Ultra-high performance concrete (UHPC) was invented in the 1970s and has been extensively researched and applied since the 1990s. UHPC has a wide range of application prospects due to its much higher compressive strength and durability than ordinary concrete, and because of its excellent flexural and tensile capabilities, UHPC has the potential to partially replace steel bars. [0003] Compared with ordinary concrete, UHPC uses the principle of close packing to combine particles of different particle sizes with an optimal ratio to achieve filling between different particle sizes. There is usually no coarse aggregate in UHPC, only fine aggregate with high strength, high-grade cement, mineral powder and a small amount of silica fume. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00198C04B2201/52C04B14/02C04B14/06C04B18/12C04B2103/302C04B2103/304C04B2103/50C04B2103/0068Y02W30/91
Inventor 王鑫秦雄赵皇周艳闵红平湛德袁康王宗平李思洁
Owner CHINA CONSTR THIRD BUREAU GREEN IND INVESTMENT CO LTD
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