CN102564904A

CN102564904A - Concrete viscometer

Info

Publication number: CN102564904A
Application number: CN2012100300986A
Authority: CN
Inventors: 杨英姿; 徐定杰
Original assignee: Harbin Institute of Technology
Current assignee: Jiangsu Jinling Construction Engineering Group Co., Ltd.; Harbin Institute of Technology
Priority date: 2012-02-10
Filing date: 2012-02-10
Publication date: 2012-07-11
Anticipated expiration: 2032-02-10
Also published as: CN102564904B

Abstract

The invention discloses a concrete viscometer, which relates to a viscometer, in particular to a concrete viscometer. The concrete viscometer aims at solving the problem that a concrete viscometer in prior arts cannot accurately measure the rheological parameter of concrete. According to the invention, all slide rails are laid on the surface of a test bench through two slide rail brackets; a long slot is laid on the surface of the test bench; a framework is sleeved on a roller; two slide rail grooves are respectively arranged at two ends of the roller; a pulley is installed between two slide rails; one end of a string is connected with the middle of a long side of the framework; the other end of the string is connected with a weight via the surface of the pulley; the weight can pull the roller to move on a horizontal plane along the two slide rails through gravity; two weight travel switches are arranged on a vertical plane at one end of the test bench from the upper part to the lower part; when the weight longitudinally moves along the vertical plane and passes the weight travel switches, the weight can contact the weight travel switches; and each weight travel switch is connected with a timer. The concrete viscometer is used for measuring the viscosity of concrete.

Description

A kind of concrete viscosity apparatus

Technical field

The present invention relates to a kind of viscosity apparatus, be specifically related to a kind of concrete viscosity apparatus.

Background technology

The measuring method of rheological parameters of fresh mixed concrete is pressed the theory that Bingham proposes, and will measure yield stress and two parameters of plastic viscosity of fresh concrete at least, and foreign scholars have done many improvements in order to measure this two parameters to existing viscosity apparatus.Famous scholar G.H.Tattersall and his students have been improved the structure of flow graph, have designed multi-form paddle.The scholar that goes together in Japan and Europe has done the work that improves flow graph.But the data and the correlation curve of the relevant concrete flow variable element of various countries scholar laboratory report differ greatly so far, and the laboratory report conclusion is very inconsistent.The existing concrete rheological parameter is measured the subject matter that exists: 1, paddle can not make concrete form the laminar condition of stable even matter; 2, measuring the main drive shaft rotating torque is coarse as the shearing moment that calculates viscosity.

Summary of the invention

The present invention can accurately not measure the problem of concrete flow variable element in order to solve the existing concrete viscosity apparatus, and then proposes a kind of concrete viscosity apparatus.

The present invention addresses the above problem the technical scheme of taking to be: the present invention includes testing table, elongated slot, running roller, pulley, counterweight, framework, cord, two one slide rails, two counterweight travel switches and four sliding rail racks, every one slide rail is placed on the table top of testing table through two sliding rail racks, and two one slide rails are set in parallel on the table top of testing table side by side; Elongated slot is placed on the table top of testing table, and elongated slot is arranged between two one slide rails, and framework is by two minor faces and two rectangle frameworks that long limit is formed; Framework is sleeved on the running roller; And the running roller two ends are rotationally connected with the middle inside of a minor face of framework respectively, and the two ends of running roller respectively are provided with a sliding-rail groove respectively, and each is slidingly connected with an one slide rail sliding-rail groove at running roller two ends respectively; And the wheel sheet of running roller can be invaded in the concrete in the elongated slot; Pulley is installed between two one slide rails, and is positioned at the edge of worktable one end, and an end of cord is connected with the middle part on a long limit of framework; The other end of cord is connected with counterweight through the surface of pulley; Counterweight can rely on gravity pulling running roller to move on surface level along two one slide rails, is provided with two counterweight travel switches on the vertical plane of testing table one end from top to bottom, when counterweight when vertical plane moves up and down through the counterweight travel switch; Counterweight can touch the counterweight travel switch, and each counterweight travel switch is connected with timer.

The invention has the beneficial effects as follows: the moment of drive roller wheel of the present invention is constant, and the suffered gravity of counterweight is that driving force is reliable and stable, has higher precision; The weight that changes counterweight can change the size of driving force, promptly can change the velocity of rotation of running roller, and is easy to adjust; Three wheel sheets are immersed in the concrete, are prone to reject the influence of the unevenness of inside concrete to test result; The present invention is simple in structure, and non-transformer drives, and makes simple and easyly, and cost is low; Only need timing that higher precision is arranged, just can accurately measure concrete plastic viscosity.

Description of drawings

Fig. 1 is an one-piece construction synoptic diagram of the present invention, and Fig. 2 is the left cut-open view of Fig. 1, and Fig. 3 is the cut-open view of framework.

Embodiment

Embodiment one: combine Fig. 1, Fig. 2 and Fig. 3 that this embodiment is described, the said a kind of concrete viscosity apparatus of this embodiment comprises testing table 1, elongated slot 2, running roller 3, pulley 4, counterweight 5, framework 6, cord 10, two one slide rails 7, two counterweight travel switches 8 and four sliding rail racks 9, and every one slide rail 7 is placed on the table top of testing table 1 through two sliding rail racks 9; And two one slide rails 7 are set in parallel on the table top of testing table 1 side by side; Elongated slot 2 is placed on the table top of testing table 1, and elongated slot 2 is arranged between two one slide rails 7, and framework 6 is by two minor face 6-1 and two rectangle frameworks that long limit 6-2 forms; Framework 6 is sleeved on the running roller 3; And running roller 3 two ends are rotationally connected with the middle inside of a minor face 6-1 of framework 6 respectively, and the two ends of running roller 3 respectively are provided with a sliding-rail groove 3-1 respectively, and each is slidingly connected with an one slide rail 7 the sliding-rail groove 3-1 at running roller 3 two ends respectively; And the wheel sheet 3-3 of running roller 3 can invade in the concrete in the elongated slot 2; Pulley 4 is installed between two one slide rails 7, and is positioned at the edge of worktable 1 one ends, and an end of cord 10 is connected with the middle part of a long limit 6-2 of framework 6; The other end of cord 10 is connected with counterweight 5 through the surface of pulley 4; Counterweight 5 can rely on gravity pulling running roller 3 to move on surface level along two one slide rails 7, is provided with two counterweight travel switches 8 on the vertical plane of testing table 1 one ends from top to bottom, and each counterweight travel switch 8 is connected with timer; When counterweight 5 when vertical plane moves up and down through counterweight travel switch 8, counterweight 5 can touch counterweight travel switch 8.

Embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described; The running roller 3 of the said a kind of concrete viscosity apparatus of this embodiment is made up of rotating shaft 3-2 and three wheel sheet 3-3; Three wheel sheet 3-3 parallel side by side equidistantly being sleeved on the rotating shaft 3-2, and each takes turns sheet 3-3 and rotating shaft 3-2 is affixed is integral.The thickness of wheel sheet is 5mm～10mm in this embodiment, and the wheel sheet immerses the concrete degree of depth and is 1/3～1/2 of the concrete degree of depth more.Other composition and annexation are identical with embodiment one.

Embodiment three: combine Fig. 1 that this embodiment is described, the table top of the testing table 1 of the said a kind of concrete viscosity apparatus of this embodiment and the height H on ground are 800mm, and the distance L between the table top of every one slide rail 7 and testing table 1 is 180mm.Other composition and annexation are identical with embodiment one or two.

Principle of work

In elongated slot 2, fill concrete sample, make the concrete sample surfacing, the two ends of running roller 3 are placed on respectively on two one slide rails 7; And three wheel sheet 3-3 of running roller 3 are got in the concrete sample; Counterweight 5 relies on gravity pulling running rollers 3 to move horizontally along slide rail 7, and concrete produces resistance to the rolling of wheel sheet 3-3, when counterweight 5 during from top to bottom through counterweight upper stroke switch 8 timer pick up counting; When counterweight 5 passed through the counterweight travel switch, timer stopped timing.If counterweight 5 is S through the distance between two counterweight travel switches, can know that through timer counterweight is T through the time apart from S, the fall off rate V=S/T of counterweight then, the fall off rate V of counterweight be that the rate travel of running roller 3 on slide rail 7 is relevant.Because wheel sheet 3-3 extend in the concrete, the fall off rate V of counterweight is relevant with concrete viscosity.One timing of counterweight weight, concrete viscosity is big more, and the fall off rate V of counterweight is slow more.Through changing the weight of counterweight, obtain different counterweight fall off rates.Set up the monobasic linear fit equation of counterweight weight and its fall off rate, the slope of this equation can be used for characterizing concrete plastic viscosity, and intercept can characterize concrete yield stress.

The scaling method of instrument: select a known-viscosity coefficient η for use ₀Standard flow such as castor oil; Utilize measurement mechanism of the present invention; According to the aforesaid operations process, set up the relation curve between counterweight weight and the counterweight fall off rate, be horizontal ordinate with the fall off rate of counterweight; Counterweight weight is the ordinate mapping, and the scale-up factor of the slope of gained monobasic linear equation and standard flow viscosity number is meter constant κ behind the linear fit.Divided by meter constant κ, can draw the plastic viscosity of fresh concrete with the slope in the linear relationship curve of the weight of counterweight in the fresh concrete and counterweight fall off rate.

Claims

1. concrete viscosity apparatus; It is characterized in that: said a kind of concrete viscosity apparatus comprises testing table (1), elongated slot (2), running roller (3), pulley (4), counterweight (5), framework (6), cord (10), two one slide rails (7), two counterweight travel switches (8) and four sliding rail racks (9); Every one slide rail (7) is placed on the table top of testing table (1) through two sliding rail racks (9), and two one slide rails (7) are set in parallel on the table top of testing table (1) side by side, and elongated slot (2) is placed on the table top of testing table (1); And elongated slot (2) is arranged between two one slide rails (7); The rectangle framework that framework (6) is made up of two minor faces (6-1) and two long limits (6-2), framework (6) is sleeved on the running roller (3), and running roller (3) two ends are rotationally connected with the middle inside of the minor face (6-1) of framework (6) respectively; The two ends of running roller (3) respectively are provided with a sliding-rail groove (3-1) respectively; Each is slidingly connected with an one slide rail (7) respectively for the sliding-rail groove (3-1) at running roller (3) two ends, and the wheel sheet (3-3) of running roller (3) can invade in the concrete in the elongated slot (2), and pulley (4) is installed between two one slide rails (7); And be positioned at the edge of worktable (1) one end; One end of cord (10) is connected with the middle part on a long limit (6-2) of framework (6), and the other end of cord (10) is connected with counterweight (5) through the surface of pulley (4), and counterweight (5) can rely on gravity pulling running roller (3) to move on surface level along two one slide rails (7); Be provided with two counterweight travel switches (8) on the vertical plane of testing table (1) one end from top to bottom; Each counterweight travel switch (8) is connected with timer, and when counterweight (5) moves up and down through the counterweight travel switch when (8) along vertical plane, counterweight (5) can touch counterweight travel switch (8).

2. according to the said a kind of concrete viscosity apparatus of claim 1; It is characterized in that: said running roller (3) is made up of rotating shaft (3-2) and three wheel sheets (3-3); Three parallel side by side equidistantly being sleeved in the rotating shaft (3-2) of wheel sheet (3-3), and each takes turns sheet (3-3) and affixed being integral of rotating shaft (3-2).

3. according to claim 1 or 2 said a kind of concrete viscosity apparatus, it is characterized in that: the height (H) on the table top of said testing table (1) and ground is 800mm, and the distance (L) between the table top of every one slide rail (7) and testing table (1) is 180mm.