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Method for detecting flow velocity of concrete additive compatible mortar

A concrete admixture and flow rate detection technology, which is applied in the field of concrete, can solve the problems of flow effect, setting time, slump area that cannot meet modern buildings, and property incompatibility, and achieve the effect of shortening verification time and accurate performance

Inactive Publication Date: 2018-03-27
河北合众建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In modern technology, concrete is added with admixtures to change its performance, but some admixtures are incompatible with the actual properties, and cannot meet the needs of modern buildings in terms of flow effect, setting time, and slump area.

Method used

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  • Method for detecting flow velocity of concrete additive compatible mortar
  • Method for detecting flow velocity of concrete additive compatible mortar
  • Method for detecting flow velocity of concrete additive compatible mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Equipment preparation: 1 set of cement mortar mixer, which meets the requirements of JC / T681; several expansion cylinders, Tube, 684ml; several glass plates, side length 550mm; 1 stopwatch, graduation value 0.1s.

[0019] Pretreatment: Wipe the inner wall of the mixing pot, mixing blade, expansion cylinder and glass plate of the cement mortar mixer evenly with a damp cloth to make the surface moist; place the glass plate horizontally, place the expansion cylinder in the center of the glass plate, and wipe it with a damp cloth Overwrite spare. A damp cloth is standard without dripping water.

[0020] Preparation of mortar with admixture: Add the weighed cementitious material and sand into the stirring pot (that is, put the raw material components of the mortar in the stirring pot), stir for 10 seconds, and add the water mixed with the admixture evenly into the mixing pot. In the stirring pot, add time ≤ 5s, stir evenly, during the stirring process, lift the stirring p...

Embodiment 2

[0034] Equipment preparation: 1 set of cement mortar mixer, which meets the requirements of JC / T681; several expansion cylinders, Tube, 684ml; several glass plates, side length 550mm; 1 stopwatch, graduation value 0.1s.

[0035] Pretreatment: Wipe the inner wall of the mixing pot, mixing blade, expansion cylinder and glass plate of the cement mortar mixer evenly with a damp cloth to make the surface moist; place the glass plate horizontally, place the expansion cylinder in the center of the glass plate, and wipe it with a damp cloth Overwrite spare. A damp cloth is standard without dripping water.

[0036] Preparation of mortar with admixture: Add the weighed cementitious material and sand into the stirring pot (that is, put the raw material components of the mortar in the stirring pot), stir for 10 seconds, and add the water mixed with the admixture evenly into the mixing pot. In the stirring pot, the adding time is 3s, stir evenly, during the stirring process, lift the st...

Embodiment 3

[0051] With the same method as above-mentioned Example 2, but the type and dosage of admixture are different, the time for measuring the T340 time is 16s, and the flow rate=(340-80)÷2÷16=8.125mm / s<10mm / s, which shows that it is not conducive to construction During pouring and pumping construction, the pumping resistance is relatively large, and pipe blockage is prone to occur. verified with concrete tests,

[0052] 1. Carry out the slump test of the above-mentioned concrete: put the concrete into the standard conical slump cylinder according to the prescribed method, after it is filled and leveled, lift the cylinder vertically upwards and move it aside, the concrete will slump due to its own weight, and the concrete will slump. The flow is slow, the slurry is thicker, and the thixotropy is poor.

[0053] 2. Take the concrete prepared above and carry out mechanical vibration. It is found that under the action of mechanical vibration, the flow is slow, indicating that the fluid...

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Abstract

The invention relates to a method for detecting flow velocity of concrete additive compatible mortar, belonging to the technical field of concrete. The method comprises the following steps: A, determining T340 time, namely putting a divergence drum in the center of a glass plate, pouring mortar added with an additive into the divergence drum, striking off after no bubble escapes and a mortar surface does not sink any more, then vertically lifting the divergence drum at a constant speed, starting timing when the divergence drum leaves the glass plate, and stopping timing when mortar divergencediameter reaches 340mm, wherein the obtained time is T340 time; and B, determining the flow velocity of the mortar, namely calculating by utilizing the formula that the flow velocity is equal to (340-inner diameter of the divergence drum) / 2 / T340 time, wherein the unit of the inner diameter of the divergence drum is mm, the unit of the T340 time is s, and the unit of the flow velocity is mm / s. Thedetection method provided by the invention is simple and is not influenced by the environment and external factors, and the detected flow velocity of the mortar is accurate.

Description

technical field [0001] The invention belongs to the technical field of concrete and relates to a method for detecting the flow velocity of concrete admixture compatibility mortar. The detection method of the invention is simple, not affected by the environment and external factors, and the measured mortar flow velocity is accurate. Background technique [0002] With the progress of the times, people's building quality is getting higher and higher, and today's buildings are inseparable from cement concrete. Modern concrete mainly develops from the trends of high fluidity, high compactness, adjustable cohesion, high durability, and high strength. At the same time, the process of preparing concrete should start from the aspects of low cost and easy molding. Only with these can meet the needs of modern society . In order to make concrete have these characteristics, a material is often added during the preparation process or before processing to improve the performance of its c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
CPCG01N11/00
Inventor 吴建忠拜秀玲张杰君王冀川
Owner 河北合众建材有限公司
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