Early strength type water reducing agent for precast concrete

A technology of precast concrete and water reducing agent, applied in the field of early strength water reducing agent, can solve the problems of rising production cost, low water reducing rate and alkali content, and rapid loss of concrete slump, etc.

Inactive Publication Date: 2011-12-14
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the water-reducing agent used for precast concrete is mainly naphthalene-based water-reducing agent, which has the advantages of low air content and fast strength growth, but the slump loss of concrete prepared with naphthalene-based water-reducing agent is fast, The appearance of the finished product is poor
[0004] CN101200354A discloses a preparation method of concrete super early strength agent, which uses up to 35-55% inorganic early strength components and 5-10% organic early strength components to accelerate the growth of early strength, to promote concrete in In the case of low temperature in winter, it solidifies and harden

Method used

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  • Early strength type water reducing agent for precast concrete
  • Early strength type water reducing agent for precast concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 53.80kg of water and place it in a reaction kettle, then add 1.00kg of lithium sulfate and 5.00kg of sodium nitrate successively under stirring, and add 40.00kg of 40% solid content polycarboxylate water reducer (VIVID- 500 (D type), weight average molecular weight 31200, produced by Shanghai Sanrui Polymer Material Co., Ltd.), then add 0.20kg polysiloxane defoamer BYK-065, and continue to stir evenly to obtain the early strength type of the present invention Water reducer, recorded as ESWR-1.

Embodiment 2

[0024] At room temperature, weigh 38.40kg of water and place it in a reaction kettle, then add 0.50kg of lithium nitrate, 3.00kg of sodium thiocyanate and 8.00kg of calcium nitrate under stirring, and add 50.00kg of 40% solid content after the inorganic salt is completely dissolved Polycarboxylate superplasticizer (VIVID-500 (type A), weight average molecular weight 39,000, produced by Shanghai Sanrui Polymer Material Co., Ltd.), then add 0.10kg of silicone oil defoamer TEGO Antifoam 204, continue to stir evenly That is, the early-strength water reducer of the present invention is obtained, which is designated as ESWR-2.

Embodiment 3

[0026] At room temperature, weigh 32.85kg of water and put it in the reaction kettle, then add 2.00kg of lithium carbonate and 5.00kg of sodium sulfate in turn under stirring, and add 60.00kg of polycarboxylate water reducer with 40% solid content after the inorganic salt is completely dissolved (VIVID-500 (Type C), weight average molecular weight 39000, produced by Shanghai Sanrui Polymer Material Co., Ltd.), then add 0.15kg of polyether modified silicone defoamer LM-110, and continue stirring to obtain this The invented early-strength water reducer is designated as ESWR-3.

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Abstract

The invention discloses an early strength type water reducing agent for precast concrete. The early strength type water reducing agent comprises the following components by weight percent: 5.00-6.00% of polycarboxylic acid water reducing agent, 0.50-2.00% of inorganic lithium salt, 1.00-5.00% of inorganic sodium salt, 0.00-10.00% of inorganic calcium salt, 0.01-0.30% of deformer and the balance of filling material. The early strength type water reducing agent has the characteristics that the doped amount is low, the air bleeding is low, the water reduction is high, slump is well maintained, and the early strength is rapidly increased; and by utilizing the early strength type water reducing agent, the steam heating and maintenance of the precast concrete are shortened or avoided, thereby reducing the production cost of the precast concrete.

Description

technical field [0001] The invention relates to the field of building material additives, in particular to an early-strength water reducer for prefabricated concrete. Background technique [0002] In recent years, the construction of major projects such as subways, south-to-north water diversion, west-to-east gas transmission, and passenger dedicated lines, as well as large-scale urban reconstruction, have driven the rapid development of cement concrete materials, and directly led to the demand for prefabricated concrete components such as segments and piles. surge. Taking prestressed high-strength concrete pipe piles (PHC pipe piles for short) as an example, the national output of PHC pipe piles was 20 million m in 1998, 45 million m in 2001, 80 million m in 2003, and 150 million m in 2005. In 2007, the output reached 250 million m, which shows its rapid development. [0003] At present, the water-reducing agent used for precast concrete is mainly naphthalene-based water-...

Claims

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Application Information

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IPC IPC(8): C04B24/40C04B24/42C04B24/32C04B103/30
Inventor 冯中军邓最亮傅乐峰郑柏存
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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