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Device and method for detecting slow release performance of concrete slump retaining agent

A slow-release performance and slump-retaining agent technology, which is applied in the field of building materials, can solve problems such as cognitive barriers and guidance errors, and there is no relevant standard for slump-retaining agents, and achieve the effect of easy operation

Inactive Publication Date: 2014-02-26
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GB8076-2008 "Concrete Admixture", GBT8077-2000 "Concrete Admixture Homogeneity Test Method" and other current admixture standards are only applicable to high-performance water reducers (early strength type, standard type, retarded type), High-efficiency water reducer (standard type, retarder type), common water reducer (early strength type, standard type, retarder type), air-entraining water reducer, pumping agent, early strength agent, retarder and air-entraining There are 8 types of concrete admixtures in total. There is currently no relevant standard for the detection of slump-retaining agents, and the standards for polycarboxylate superplasticizers are generally used. This will cause a certain degree of difficulty in evaluating and distinguishing the slow-release performance of different slump-retaining agents. Cognitive Blocking and Guidance Errors

Method used

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  • Device and method for detecting slow release performance of concrete slump retaining agent
  • Device and method for detecting slow release performance of concrete slump retaining agent
  • Device and method for detecting slow release performance of concrete slump retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put the mixer in the standby state first, and then operate according to the following procedures: Add 175g of water and 1.6% slump-retaining agent (concentration: 10%) into the pot, then add 300g of cement and 150g of fly ash, put the pot Put it on the fixed frame, raise it to a fixed position, then start the machine immediately, after stirring at low speed for 30s, add sand evenly at the beginning of the second 30s, turn the machine to high speed and mix for another 30s. Stop stirring for 60s, use a spatula to scrape the plastic sand on the blade and pot wall into the middle of the pot within the first 15s, continue stirring at high speed for 60s, the error of stirring time at each stage should be within ±1s.

[0024] While mixing the slurry, wipe the glass plate, tamper, and truncated cone mold on the horizontal table with a damp cloth, place them in the center of the glass plate, and cover with a damp cloth for later use.

[0025] Put the mixed slurry into the mold t...

Embodiment 2

[0029] Put the mixer in the waiting state first, and then operate according to the following procedures: Add 182g of water and 1.6% slump-retaining agent (concentration: 10%) into the pot, then add 300g of cement, 100g of fly ash, ore Powder 50g, put the pot on the fixed frame, rise to a fixed position, then start the machine immediately, stir at low speed for 30s, add sand evenly at the beginning of the second 30s, turn the machine to high speed and mix for 30s. Stop stirring for 60s, use a spatula to scrape the plastic sand on the blade and pot wall into the middle of the pot within the first 15s, continue stirring at high speed for 60s, the error of stirring time at each stage should be within ±1s.

[0030] While mixing the slurry, wipe the glass plate, tamper, and truncated cone mold on the horizontal table with a damp cloth, place them in the center of the glass plate, and cover with a damp cloth for later use.

[0031] Quickly divide the mixed slurry into the mold in two...

Embodiment 3

[0035] Put the mixer in the standby state first, and then operate according to the following procedures: Add a certain amount of water and a set amount of slump-retaining agent into the pot, then add 300g of cement, 80g of fly ash, 50g of mineral powder, and 20g of mud powder , put the pot on the fixed frame, raise it to a fixed position, then start the machine immediately, after stirring at low speed for 30s, add sand evenly at the beginning of the second 30s, turn the machine to high speed and stir for another 30s. Stop stirring for 60s, use a spatula to scrape the plastic sand on the blade and pot wall into the middle of the pot within the first 15s, continue stirring at high speed for 60s, the error of stirring time at each stage should be within ±1s.

[0036]While mixing the slurry, wipe the glass plate, tamper, and truncated cone mold on the horizontal table with a damp cloth, place them in the center of the glass plate, and cover with a damp cloth for later use.

[0037...

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Abstract

The invention relates to a device and a method for detecting slow release performance of a concrete slump retaining agent. The device comprises three parts, namely a sample preparation device, a stirring device and a slow release performance testing device, wherein the sample preparation device comprises a plastic or glass container, a liquid transfer suction tube and an analytical balancer or an electronic scale; the stirring device is a stirrer which can uniformly stir cement, coal ash, mineral powder, standard sand, water and a water reducing agent in the specified time; the slow release performance testing device comprises a glass plate, a frustum round die, a tamper, a timer and a plastic or metallic container. The slow release performance of the concrete slump retaining agent is characterized by utilizing the average diameter and the longitudinal value of a flowing part at three moments such as an initial state of the stirred and mixed size, 1 hour and 1.5-2 hours. The method is simple and effective, the neat paste and concrete testing step can be reduced, and the waste of cement-based materials and the environmental influence caused by the discarded materials are reduced in the testing process.

Description

[0001] technical field [0002] The invention relates to a device and method for detecting the slow-release performance of a concrete slump-retaining agent, belonging to the field of building materials. Background technique [0003] With the construction of large-scale infrastructure such as high-speed, water conservancy, bridges, and tunnels in my country, especially the planning and implementation of high-speed rail network projects, the market demand for polycarboxylic acid-based high-performance water reducers continues to grow. Polycarboxylate water reducer is a kind of surfactant containing carboxyl graft copolymer in its molecule. Its unique molecular structure makes it have many unique advantages, such as low dosage, high water reducing rate, and significant increase in early strength. , not retarded, etc. There are several problems in the use of polycarboxylate water reducers, among which the serious slump loss of concrete is the most prominent. The main method to...

Claims

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Application Information

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IPC IPC(8): G01N11/00
Inventor 柯凯徐保明唐强陈坤
Owner HUBEI UNIV OF TECH
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