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Retardation setting type polycarboxylic acids series water reducing agent

A technology of retarding polycarboxylic acid and polycarboxylic acid series, which is applied in the field of building materials to achieve the effect of improving concrete strength, low price and high water reducing rate

Inactive Publication Date: 2008-07-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1, a low-cost retarding type polycarboxylic acid water reducing agent was compounded in the following weight ratio: a polycarboxylic acid water reducing agent (concentration) using allyl polyethylene glycol (molecular weight 1000) as the raw material 20%) 39.55%, sodium lignosulfonate 10.52%, sodium gluconate 1.55%, sodium pyrophosphate 3.38%, and water 45.00%. By adding a compound product that accounts for 1.5% of the weight of the cementitious material, the water reduction rate of concrete can reach 25%, the initial setting time is 9 hours, and the final setting time is 12 hours.

Embodiment 2

[0028] Example 2, a low-cost retarding type polycarboxylic acid water reducing agent was compounded in the following weight ratio: a polycarboxylic acid water reducing agent (concentration) using allyl polyethylene glycol (molecular weight 600) as the raw material 40%) 24.43%, sodium lignosulfonate 11.96%, sodium citrate 2.39%, sucrose 1.22% and water 60.00%. When mixed with a compound product that accounts for 1.6% of the weight of the cementitious material, the water reduction rate of concrete can reach 20%, the initial setting time is 9 hours and 40 minutes, and the final setting time is 15 hours.

Embodiment 3

[0029] Example 3, a low-cost retarding type polycarboxylic acid water reducing agent was compounded in the following weight ratio: a polycarboxylic acid water reducing agent using allyl polyethylene glycol (molecular weight 2500) as the raw material (concentration 60%) 24.90%, sodium lignosulfonate 12.83%, sodium citrate 3.05%, sodium pyrophosphate 4.85%, sucrose 2.37% and water 52.00%. When mixed with a compound product accounting for 1.4% of the weight of the cementitious material, the water reduction rate of the concrete can reach 28%, the initial setting time is 49 hours, and the 28-day strength of the concrete is 64.5MPa.

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Abstract

The invention belongs to the technical field of architectural materials, specifically relating to a retarded polycarboxylic acids series water reducing agent. The compounded components are polycarboxylic acids series water reducing agent employing allyl group polyethylene glycol as raw material, sodium lignosulphonate, gluconic acid sodium salt, sodium citrate, sodium pyrophosphate, sucrose and water which are added to a mixing machine under normal temperature. After full agitation and dissolution, then the invention is prepared. The raw materials of the invention are low in price, the performance of the products is stable, and the invention has good market prospect.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a low-cost retarding type polycarboxylic acid water reducer. Background technique [0002] Concrete admixture is an indispensable component of modern concrete, which can improve concrete performance according to specific requirements. Incorporating an appropriate amount of compounded retarder and water reducer in the concrete can prolong the setting time of the concrete, reduce the slump loss, ensure the normal construction of the concrete, improve the work efficiency, and the strength of the concrete after hardening will increase well, which is suitable for longer needs Time-parked, long-distance concrete, as well as vibration-free self-compacting concrete, mass concrete, concrete for construction in hot weather, etc. In pre-stressed reinforced concrete post-tensioning grouting materials, the required concrete setting time can even reach more than ten days, and ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/30
CPCC04B2103/302C04B40/0039
Inventor 孙振平黄雄荣
Owner TONGJI UNIV
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