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Early strength exciting agent for large-admixture-amount granulated blast furnace slag or concrete

A technology of granulated blast furnace slag and early strength, which is applied in the field of engineering materials, can solve the problems of increasing the risk of corrosion damage, reducing the durability of mortar or concrete, and affecting the construction speed, so as to improve the early anti-seawater erosion ability and construction demolition The effect of improving mold speed and improving work efficiency

Active Publication Date: 2014-11-05
CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mortar or concrete with a large amount of granulated blast furnace slag used in seaports or offshore buildings, the early strength development is slow, which affects the demolition time and construction speed
Mortar or concrete with a large amount of granulated blast furnace slag has low early strength and poor compactness of mortar or concrete. Contact with corrosive seawater reduces the durability of mortar or concrete and increases the risk of corrosion damage in the later stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The early strength activator for large-volume granulated blast furnace slag mortar or concrete consists of the following components in parts by mass: 55 parts of hemihydrate gypsum; 30 parts of sodium aluminate; and 15 parts of calcium oxide. Weigh a certain amount of hemihydrate gypsum powder, powdered sodium aluminate, and powdered calcium oxide according to the above mass ratio, put them into a dry high-speed mixer, stir for 6 minutes to 15 minutes, and mix them into a uniform mixture. It can replace the cementitious material in large-volume granulated blast furnace slag mortar or concrete.

Embodiment 2

[0015] The early strength activator for large-volume granulated blast furnace slag mortar or concrete consists of the following components in parts by mass: 50 parts of hemihydrate gypsum; 40 parts of sodium aluminate; and 10 parts of calcium oxide. Weigh a certain amount of hemihydrate gypsum powder, powdered sodium aluminate, and powdered calcium oxide according to the mass ratio, put them into a dry high-speed mixer, stir for 6 minutes to 15 minutes, and mix them into a uniform mixture, equal to 3% of the mass of the cementitious material Replacement of high volume granulated blast furnace slag cementitious material in mortar or concrete.

Embodiment 3

[0017] The early strength activator for large-volume granulated blast furnace slag mortar or concrete consists of the following components in parts by mass: 55 parts of hemihydrate gypsum; 35 parts of sodium aluminate; and 10 parts of calcium oxide. Weigh a certain amount of hemihydrate gypsum powder, powdered sodium aluminate, and powdered calcium oxide in a dry high-speed mixer according to the mass ratio, and replace the large-volume granulated blast furnace slag mortar or Binder in concrete.

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PUM

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Abstract

The invention discloses an early strength exciting agent for large-admixture-amount granulated blast furnace slag or concrete. The early strength exciting agent is composed of following component by weight: 50-70 parts of semi-hydrated gypsum, 30-40 parts of sodium aluminate and 5-15 parts of calcium oxide. The early strength exciting agent can be achieved by evenly mixing the semi-hydrated gypsum, the sodium aluminate and the calcium oxide. The early strength exciting agent can improves early strength of the large-admixture-amount granulated blast furnace slag or concrete. The exciting agent cannot only improve early strength of mortar or concrete, later strength of the mortar or concrete using the exciting agent cannot decrease. Early marine corrosion resistance of the mortar or concrete is obviously improved, construction form removal speed is obviously improved, formwork turnover speed is quickened, and work efficiency is improved.

Description

technical field [0001] The invention relates to an engineering material, in particular to an early strength activator. Background technique [0002] In recent years, with the massive construction of seaport projects and the further deepening of research on seaport engineering, the call for improving seawater corrosion resistance of seaports or offshore structures is getting louder and louder. Section 6.3.3 of the national standard "Code for Durability Design of Concrete Structures" (GB / T50476-2008) clearly stipulates that "reinforced concrete in a marine chloride environment should use large-volume mineral admixture concrete; the Ministry of Transport standard " Section 5.1.5.3 of the Technical Code for Corrosion Protection of Concrete Structures in Seaport Engineering (JTJ275-2009) stipulates: "For concrete mixed with Portland cement, the amount of granulated blast furnace slag should not be less than 50% of the mass of the cementitious material. For concrete mixed with s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 王磊陈迅捷王尉韦华杨明张燕迟施金钱文勋纪卫尚欧阳幼玲陈杰沈建国
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD