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A seawater coral aggregate concrete

A technology of concrete and concrete water reducing agent, applied in the field of civil engineering and marine engineering materials, can solve the problems of poor workability, time-consuming and labor-intensive, and long-term strength shrinkage of freshly mixed materials, and achieve efficient pumping mechanized construction and overcome the setting time The effect of advancing and prolonging the pouring operation time

Active Publication Date: 2018-03-20
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a kind of seawater coral aggregate concrete, which has the advantages of low shrinkage, low heat of hydration, and high-strength pumping, so that it can overcome the common cement and low-strength coral concrete in the prior art. The typical shortcomings of long-term strength shrinkage, salty surface peeling, frequent shrinkage cracks and temperature cracks, and poor workability of freshly mixed materials under the harsh environment of islands and reefs; moreover, the proportion of local materials is as high as 75%. %, so it can overcome the disadvantages of high cost, time-consuming, labor-intensive, high energy consumption and low efficiency caused by long-distance shipping of ordinary concrete bulk raw materials in construction projects on remote sea islands and reefs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, the seawater coral aggregate concrete is composed of the following raw materials by mass:

[0064] 320kg of low-heat marine portland cement, 135kg of salt-fixing agent for seawater coral aggregate concrete, 183kg of seawater, 530kg of pre-screened natural coral sandstone mixture (grain size is 0-20mm), pre-screened broken coral stone sand mixture ( The particle size is 0-31.5mm) 1020kg, seawater coral aggregate concrete superplasticizer 3.6kg, concrete retarder 280g, concrete defoamer 7g.

[0065] In addition, preferably, the 3d hydration heat of the low-heat marine Portland cement is not greater than 195kJ / kg, and the 7d hydration heat is not greater than 220kJ / kg.

[0066] Preferably, the seawater coral aggregate concrete salt-fixing agent is composed of microsilica fume, nanometer silica powder, metakaolin and mineral powder.

[0067] Preferably, in the pre-screened natural coral sandstone mixture (with a particle size of 0 to 20mm), 70% to 95% o...

Embodiment 2

[0075] In this embodiment, the seawater coral aggregate concrete is composed of the following raw materials by mass:

[0076] 350kg of low-heat marine portland cement, 150kg of salt-fixing agent for seawater coral aggregate concrete, 155kg of seawater, 460kg of pre-screened natural coral sandstone mixture (grain size is 0-20mm), pre-screened broken coral stone sand mixture ( The particle size is 0-31.5mm) 1060kg, seawater coral aggregate concrete water reducer 5.8kg, concrete retarder 400g, concrete defoamer 8g.

[0077] In this embodiment, the raw materials used in the seawater coral aggregate concrete are the same as those in Embodiment 1.

[0078] In this example, the 28d compressive strength of the seawater coral aggregate concrete is 52.1MPa, and the long-term strength is stable without shrinkage; its 28d self-shrinkage is zero, and the 28d total shrinkage is higher than that of ordinary sandstone aggregates of the same strength. Concrete should be reduced by about 200με...

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Abstract

The invention provides seawater coral aggregate concrete prepared by matching low-heat portland cement for ocean projects, a seawater coral aggregate concrete salt fixing agent, a pre-screened natural coral-sand mixture (with the particle size of 0-20 mm), a pre-screened broken coral-sand mixture (with the particle size of 0-31.5 mm), a coral aggregate seawater concrete water reducing agent, a concrete retarder, a concrete defoaming agent, natural seawater or primary desalined seawater. With application of the seawater coral aggregate concrete, the shortcomings that ordinary cement and low-strength coral concrete easily generate long-term strength back shrinkage, skin cracking and peeling of surface salt marsh, frequently happening shrinkage cracks and temperature cracks and poor new mixing workability and thus cannot be pumped for construction on service in a tropical offshore reef harsh environment can be overcome; the ratio of used local materials reaches up to 75% or more, so the shortcomings of high cost, time consuming, labor consuming, high energy consumption and low efficiency due to long-distance sea transportation of ordinary concrete large-amount raw materials in offshore reef construction projects can be overcome.

Description

technical field [0001] The invention relates to the technical field of civil engineering and marine engineering materials, in particular to seawater coral aggregate concrete. Background technique [0002] To carry out civil engineering construction on remote islands and reefs more than 1,000 kilometers away from land, such as the land reclamation project on islands and reefs in the South China Sea, requires the use of huge amounts of concrete materials. Offshore revetment on the periphery of islands and reefs (including molded bag concrete, wave retaining walls, twisted work / Wang character wave breaking blocks), island and reef roads, water conservancy, wharves, cofferdams, airports, housing construction, municipal, civil and military fortifications, etc. The project requires the use of a large amount of concrete. [0003] my country's South China Sea islands and reefs are close to the equator, with high temperature, high humidity, high salinity, rainy, strong wind, sun exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/28C04B111/34
CPCC04B14/28C04B28/04C04B2111/00146C04B2111/346C04B2103/0068C04B2103/302C04B2103/22C04B2103/50C04B22/0026C04B18/146C04B14/04C04B14/106C04B18/14C04B24/24C04B24/10C04B24/40
Inventor 韩宇栋紫民岳清瑞郭东张宏波郝挺宇王建平连伟侯兆新苏波曾滨李春平
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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