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Self-compacting expansive concrete

An expansive concrete and self-compacting technology, which is applied in the field of building materials, can solve the problems of large amount of cementitious materials and large shrinkage, and achieve the effects of widening the use range, enhanced functions, and a wide use temperature range

Inactive Publication Date: 2017-02-01
天津市堃淏混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although self-compacting concrete has many advantages, compared with ordinary concrete, self-compacting concrete will shrink more due to the large amount of cementitious materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Weigh 11.5kg of SY-T anti-crack and waterproof expansion agent and 11.5kg of CAL air-entraining composite fiber expansion agent and add them to the mixer for thorough mixing to prepare a mixed expansion agent for use as a spare;

[0036] Step 2: Weigh 4kg polycarboxylate retarding high-efficiency superplasticizer and 6kg tea-based superplasticizer and add them to the mixer for thorough mixing to prepare a mixed superplasticizer for use as a spare

[0037] Step 3: Weigh 340kg of cement, 80kg of mineral powder, 50kg of fly ash, 300kg of perlite crushed stone, 240kg of vermiculite crushed stone, 360kg of calcite crushed stone, 680kg of natural river sand and 350kg of water into the mixer, and Stir at a speed of 200rpm, and at the same time, add the mixed expansion agent and mixed water reducer in step 1 and step 2, and the stirring time is controlled at about 30min;

[0038] Step 4: Weigh 3kg of CTF synergist, 2.4kg of sodium monofluorophosphate and 2.8kg of sodium a...

Embodiment 2

[0041] Step 1: Weigh 11.6kg of SY-T anti-crack and waterproof expansion agent and 17.4kg of CAL air-entraining composite fiber expansion agent and add them to the mixer for thorough mixing to prepare a mixed expansion agent for use as a spare;

[0042] Step 2: Weigh 6.7kg of polycarboxylate retarding high-efficiency superplasticizer and 13.3kg of tea-based superplasticizer and add them to the mixer for thorough mixing to prepare a mixed superplasticizer for use as a spare

[0043] Step 3: Weigh 400kg of cement, 120kg of mineral powder, 70kg of fly ash, 275kg of perlite crushed stone, 385kg of vermiculite crushed stone, 440kg of calcite crushed stone, 760kg of natural river sand and 390kg of water into the mixer, and Stir at a speed of 200rpm, and at the same time, add the mixed expansion agent and mixed water reducer in step 1 and step 2, and the stirring time is controlled at about 30min;

[0044] Step 4: Weigh 3.4kg of CTF synergist, 2.8kg of sodium monofluorophosphate and 3...

Embodiment 3

[0047] Step 1: Weigh 11.3kg of SY-T anti-crack and waterproof expansion agent and 14.7kg of CAL air-entraining composite fiber expansion agent and add them to the mixer for thorough mixing to prepare a mixed expansion agent for use as a spare;

[0048] Step 2: Weigh 5.6kg of polycarboxylate retarding high-efficiency superplasticizer and 9.4kg of tea-based superplasticizer and add them to the mixer for thorough mixing to prepare a mixed superplasticizer for use as a spare

[0049] Step 3: Weigh 370kg of cement, 100kg of mineral powder, 60kg of fly ash, 285.7kg of perlite crushed stone, 314.3kg of vermiculite crushed stone, 400kg of calcite crushed stone, 720kg of natural river sand and 370kg of water into the mixer, Stir at a speed of 200 rpm, and at the same time, add the mixed expansion agent and mixed water reducer in step 1 and step 2, and the stirring time is controlled at about 30 minutes.

[0050] Step 4: Weigh 3.2kg of CTF synergist, 2.6kg of sodium monofluorophosphate ...

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Abstract

A self-compacting expansive concrete comprises the following components in parts by weight: 370 parts of cement, 100 parts of mineral powder, 60 parts of fly ash, 1000 parts of coarse aggregate, 720 parts of fine aggregate, 15 parts of a water reducer, 26 parts of an expansive agent, 3.2 parts of a synergist, 2.6 parts of sodium monofluorophosphate, 3.1 parts of sodium alginate and 370 parts of water, wherein the expansive agent is a mixture of an SY-T anti-cracking and waterproof expansive agent and a CAL cited gas composite fiber expansive agent. The self-compacting expansive concrete can not only satisfy the working requirement but also has the shrinkage compensating function; in addition, sodium monofluorophosphate and sodium alginate are also added to the concrete, thus the corrosion-resistant and crazing-resistant functions of the concrete are greatly enhanced, and the application range of the concrete is greatly widened.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a self-compacting expansive concrete. Background technique [0002] Self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. [0003] In recent years, the proportion of self-compacting concrete has become an important symbol to measure the technical level of a country's concrete industry. In countries such as Japan, the United States, the United Kingdom, Canada, and Germany, self-compacting concrete has reached 30% to 50% of the total amount of concrete. my country's current annual consumption is less than 5% of the total amount of concrete. At best, due to the constraints of high labor costs and lack of skilled vibrators in countries such as Europe and the United States, a large n...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/38C04B22/16C04B14/18C04B14/28C04B14/20
CPCC04B14/18C04B14/202C04B14/28C04B22/16C04B24/38C04B28/00C04B2201/50C04B14/02C04B18/08C04B14/068C04B2103/302C04B2103/0068
Inventor 宁志国
Owner 天津市堃淏混凝土有限公司
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