Crack-resistant high-strength concrete with full utilization of limestone resources

Abstract

The invention discloses crack-resistant high-strength concrete with full utilization of limestone resources. The crack-resistant high-strength concrete per cubic meter is prepared from the following ingredients by weight: 130-150kg of water, 410-470kg of cement, 70-90kg of limestone flour, 660-740kg of machine-made sand, 1,000-1,150kg of gravels, 1-1.5kg of fibers, 9.5-11kg of shrinkage reducing agent and 4.8-6.5kg of water reducing agent. The crack-resistant high-strength concrete has the advantages that the aims of the full utilization and maximized resource utilization of the limestone resources in concrete are realized, the shrinkage and cracking susceptibility of the high-strength concrete are lowered greatly, and the dependence on natural river sand and the traditional mineral admixture, which are increasingly scarce, during high-strength concrete preparation is eliminated.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a crack-resistant high-strength (C60 and above) limestone resource full utilization concrete. Background technique [0002] The application technology of coarse aggregate crushed stone in concrete is relatively mature and complete. At present, most crushing plants in the country produce a large amount of stone chips when crushing and producing crushed stones. Due to the limitation of crushed stone production level and concrete preparation technology, these stone chips have not been effectively used, occupying a large amount of cultivated land and stacking them, causing a large number of waste of limestone resources. In recent years, with the implementation of the "Technical Regulations for the Application of Artificial Sand Concrete" (JGJ / T241-2011), some crushing plants have started a new production process for crushing limestone resources, producing crushed stones...

AI Technical Summary

Problems solved by technology

[0003] Since the use of machine-made sand or limestone powder to prepare concrete will increase the shrinkage and cracking sensitivity of concrete, resulting in the fact that machine-made sand and limestone powder cannot be used alone in the preparation of concrete, and natural river sand and other mineral admixtures such as pulverized coal are usually mixed together Ash and mineral powder, etc., which greatly limit the use of machine-made sand and limestone powder, resulting in the crushed stone produced by the crushing plant is often in short supply, while the supply of machine-made sand and limestone powder is in excess

In addition, for high-strength concrete that is easy to crack, it is rare to use machine-made sand and limestone powder alone to prepare it, but mainly rely on high-quality natural river sand and traditional mineral admixtures such as fly ash and mineral powder.

These have greatly limited the full development and utilization of limestone resources in concrete, and cannot effectively get rid of the dependence on increasingly scarce natural river sand and traditional mineral admixtures such as fly ash and slag when preparing high-strength concrete.

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