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Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same

A technology of concrete composition and ready-mixed concrete, which is applied in the direction of mixing operation control, chemical instruments and methods, mixing operation control devices, etc., and can solve problems such as longer working hours, limited equipment, and increased cost of rapid-hardening concrete.

Inactive Publication Date: 2021-04-02
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method must be equipped with a concrete pouring truck, and sometimes the moisture is controlled in advance to a certain amount of fine aggregate, coarse aggregate is packed into a flexible container bag and transported to the site, or the rapid hardening cement is packed into a flexible container bag There is a problem that the cost of rapid hardening concrete will be significantly increased due to the long man-hours for transporting it to the site for standby.
In addition, the equipment of concrete pouring trucks is also limited

Method used

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  • Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same
  • Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same
  • Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0114] Cement 380kg / m 3 , rapid hardening material 120kg / m 3 , water / bonding material ratio of 32%, s / a=42%, air volume of 2.0±1.5 volume% rapid hardening concrete is mixed in a mixing container for preparation. At this time, mix 1.5 parts of dormant agent with respect to 100 parts of cement and fast-hardening material, and set the volume after mixing to 85% of the internal volume of the mixing container so that it will not be hydrated for more than 24 hours. Hardened (material A). Assuming that the handling time before arriving at the site and the waiting time after arriving at the construction site were generated, 5 parts of various hardeners (material B) shown in the following Table 1 were added after 120 minutes with respect to 100 parts of bonding material (based on the expected value) Rapid hardening concrete composition shipped by mixing concrete). The pot life after the addition of the hardener was measured, and the compressive strength was measured 6 hours after th...

experiment example 2

[0139] The curing agent II was used as the curing agent, and it was carried out in the same manner as in Experimental Example 1, except that anhydrite was blended as shown in the following table with respect to 100 parts of the curing agent II. The results are collectively described in Table 2 below.

[0140] Among them, anhydrous gypsum is based on the specific surface area of ​​5000cm 2 Type II natural anhydrous gypsum made in Thailand prepared by / g method.

[0141] [Table 2]

[0142]

[0143] From Table 2, it can be seen that by adding anhydrous gypsum to the curing agent, the expression of compressive strength after one day of material age becomes better.

experiment example 3

[0145] The chemical composition of the calcium aluminate compound of Hardener II is formulated as shown in the table below to prepare a slurry with a water / hardener ratio of 0.3 (1 part of dormant agent is added to 100 parts of Hardener II) The same procedure as in Experimental Example 2 was performed except that the curing agent II was used. The results are collectively described in Table 3 below.

[0146] In addition, the chemical composition was confirmed according to JIS R 5202 "Chemical Analysis Methods of Portland Cement".

[0147] [table 3]

[0148]

[0149] By appropriately changing the chemical composition of the calcium aluminate-based compound according to Table 3, the temperature-dependent improvement effect can be more fully exhibited, and rapid hardening can be suppressed when a curing agent is used in the slurry.

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Abstract

A hardening agent for ready-mix shipped rapid-hardening concrete is added to a composition including cement, a rapid hardening material, and a soporific, wherein the concentration of aluminum ions ina liquid phase, which can be obtained by performing solid-liquid separation on a hardening agent-containing composition which can be obtained in 30 minutes after the hardening agent is added to the composition under the condition of 5 DEG C, is at least 1.1 times the concentration of aluminum ions in a liquid phase which can be obtained by performing solid-liquid separation on a hardening agent-free composition which can be obtained without adding the hardening agent to the composition under the condition of 5 DEG C.

Description

technical field [0001] The present invention relates to a hardener for rapid-hardening concrete shipped in the form of ready-mixed concrete, a rapid-hardening concrete material shipped in the form of ready-mixed concrete, a composition of rapid-hardened concrete delivered in the form of ready-mixed concrete, and a preparation method thereof . Background technique [0002] From a global perspective, the production of cement is increasing, and infrastructure construction is advancing rapidly. Especially in China and Southeast Asia, the construction boom is still going on. In infrastructure construction, road construction plays an important role. It is desirable to start using roads as soon as possible when building new roads and when repairing them, so materials that can be used as soon as possible are also required as materials to be used. One example thereof is rapid hardening concrete. [0003] As a property required for rapid hardening concrete, usable time is also an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08B28C7/04C04B22/10C04B22/14C04B24/06C04B28/02
CPCB28C7/04C04B22/14C04B22/08C04B22/10C04B24/06C04B28/02
Inventor 岛崎大树藏本悠太森泰一郎
Owner DENKA CO LTD
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