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Pre-pour slump maximization of delivered concrete

一种混凝土、坍落度的技术，应用在黏土制备装置、化学仪器和方法、控制装置等方向，能够解决夸大量、图表误解、不正确等问题

Active Publication Date: 2019-08-23
VERIFI INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hines et al. acknowledge that graphs may be misinterpreted or may contain exaggerated quantities or incorrect values

Method used

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  • Pre-pour slump maximization of delivered concrete
  • Pre-pour slump maximization of delivered concrete
  • Pre-pour slump maximization of delivered concrete

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0077] The next thing is an example that demonstrates the unexpected benefits and delay of most percentage addition of chemical admixtures during shipping delivery. Sixteen loads of concrete based on the same concrete mix design were batched and delivered in the same concrete mixer truck equipped with an automated slump management system (Verifi LLC of Cambridge, Massachusetts USA). All concrete loads were initially adjusted to a slump of 2 inches (±1) without the use of cement dispersant chemical admixtures. At this point, take a first sample to determine strength before adding blends and to ensure consistent water content is achieved. The mixing speed of the mixer drum was set at three (3) revolutions per minute (rpm) for sixty (60) minutes.

[0078] Scenario 1 was used on ten loads where concrete was dosed with chemical admixtures to achieve an 8 inch slump immediately after initial slump was confirmed with an automated slump management system. The slump was maintained at...

example 2

[0084] In addition to dose-response, comparisons between strengths before admixture addition and at the end of each regimen were analyzed. Any variation in strength will be due to different mixing schemes, since the water and air contents are nominally equal. The increase in strength as a percentage of the initial strength of the concrete (before adding chemical admixtures) was calculated as follows: (Ultimate Strength - Initial Strength) / Initial Strength.

[0085] For regimen 1, a mean increase of 0.6±0.1% was observed, while for regimen 2, a mean increase of 5.2±0.1% was observed. ANOVA shows that the means of the sets are statistically different at 5% significance. Plus / minus values ​​indicate variance around the mean.

example 3

[0087] Further testing was done on 28 strength attributes of concrete, as tested on the concrete mix prior to adding chemical admixtures, for additional confirmation that the water content was similar for all mixes. Results from ANOVA showed no statistically significant difference between the means of the two data sets.

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Abstract

Described are a method and system for initiating a majority percentage of chemical admixture dosage into a delivered concrete load preferably just before arrival of the concrete delivery truck at thedelivery pour site, such that a maximized slump (or slump flow, or other slump characteristic) increase occurs just before discharge / pour. The invention employs a concrete slump management system having a processor that is programed to consider time of pour (discharge) and stored data that includes dosage response (change of slump characteristic) of the concrete mix due to past additions in the same type of concrete mix, and thus maximizes pre-pour increase in slump characteristic while minimizing or avoiding the risk of overshooting the slump target as well as limiting the time required for adjusting concrete to attain the target slump value at the jobsite.

Description

technical field [0001] The present invention relates to monitored concrete delivery, and more particularly to methods and systems for maximizing the dosage of plasticizer admixtures into the load of concrete mix being delivered, preferably when the concrete mix truck arrives for delivery dump The add is started before the location. Background technique [0002] Manufacturers of concrete for construction purposes have long sought the ability to dose liquid components, such as chemical admixtures, in an accurate and controlled manner, as the concrete is poured into place at the construction delivery site. Time to achieve the desired workability or target slump in the delivered concrete load. [0003] In US Patent 5,713,663 (1998) to Zandberg et al., the use of monitoring the concrete load in the mixing drum used to rotate a delivery truck and the torque used to dose the correct amount of liquid components into the concrete is disclosed. It is also disclosed that if excess wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B28/04
CPCC04B40/0032B28C7/026B28C7/0418B28C5/422C04B28/04C04B2103/32
Inventor G.A.戈德斯坦M.F.罗伯茨N.A.特雷格尔全炳和K.哈斯拉蒂
Owner VERIFI INC
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