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Concrete shrinkage cracking composite regulation and control system and regulation and control method

A shrinkage cracking and concrete technology, applied in construction, building material processing, building construction, etc., can solve problems such as limited application scope, low shrinkage cracking control efficiency, and poor concrete cracking resistance and durability.

Active Publication Date: 2020-11-27
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, in view of the current situation and problems of concrete shrinkage cracking control above, the purpose of the present invention is to provide a concrete shrinkage cracking composite control system and its control method, to solve the low efficiency of concrete shrinkage cracking control in the prior art, concrete cracking resistance Poor performance and durability, limited scope of application, etc.

Method used

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  • Concrete shrinkage cracking composite regulation and control system and regulation and control method
  • Concrete shrinkage cracking composite regulation and control system and regulation and control method
  • Concrete shrinkage cracking composite regulation and control system and regulation and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1: C50 large-volume concrete is regulated by self-curing components and shrinkage-compensating components.

[0061] The self-curing component used in Example 1 is acrylic acid-acrylamide cross-linked superabsorbent copolymer (SAP), without pre-absorbing water, and the shrinkage compensating component is calcium sulfoaluminate-calcium oxide expansion agent (HCSA), and the concrete mix ratio , 28-day compressive strength (cured under the same conditions, the size of the test piece is 100mm×100mm×100mm, the same below) and 28-day self-shrinkage results are shown in Table 1, where the mix ratio numbered 1-0 is the base mix ratio, and Composite control is adopted, and the 1-1 mix ratio is the mix control ratio of the self-curing component and the compensating shrinkage component. When testing concrete shrinkage, keep the concrete specimen in a sealed state, that is, the measured concrete shrinkage is autogenous shrinkage.

[0062] In the mix ratio of Table 1, the co...

Embodiment 2

[0067] Example 2: C40 concrete in the dry and windy environment of Northwest China, adopting external maintenance measures and passive components for compound regulation.

[0068] The external curing measures used in the embodiment two are styrene-acrylic emulsion system external curing agent, and the effective curing time of the styrene-acrylic emulsion external curing agent is greater than 14 days. Curing agent; the passive component is a mixture of polyvinyl alcohol fiber (length 25mm, diameter 15μm) and steel fiber (length 30mm, diameter 1.2mm). The concrete mix ratio, 28-day compressive strength and 28-day total shrinkage results are shown in Table 2, where the number 2-0 mix ratio is the base mix ratio, no compound control is used, and the 2-1 mix ratio is the use of external curing measures Mixing ratio of compound regulation with passive components. When testing concrete shrinkage, keep the concrete specimen in a dry state on the upper surface. The measured concrete s...

Embodiment 3

[0072] Example 3: C50 concrete in perennial high-temperature and high-humidity (annual average temperature 25-30°C, RH≥85%) remote sea island and reef environment, using composite control of shrinkage compensating components and shrinkage reducing components.

[0073] The shrinkage compensating component used in embodiment three is calcium sulfoaluminate-calcium oxide expansion agent (HCSA), and the shrinkage reduction component used is polyol ether organic shrinkage reducer (SRA), concrete mix ratio, 28-day compressive strength and The 28-day total shrinkage results are shown in Table 3, wherein the number 3-0 mix ratio is the base mix ratio without compound control, and the 3-1 mix ratio is the mix ratio that uses the compound control of the compensating shrinkage component and the shrinkage reducing component . When testing concrete shrinkage, keep the concrete specimen in a dry state on the upper surface. The measured concrete shrinkage is the total shrinkage (ie, the sum ...

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Abstract

The invention discloses a concrete shrinkage cracking composite regulation and control system and regulation and control method. The system comprises one or more of an internal doping composite regulation and control system formed between two internal doping components, an internal and external composite regulation and control system formed between the internal doping components and external curing measures, and a driving and driven composite regulation and control system formed between the internal doping components or the external curing measures and the driven components. According to the system, a plurality of composite regulation and control systems are formed among the internal doping components, the external curing measures and the driven components, and meanwhile, the calculation method of the doping amount of each component and the external curing measures are optimized, so that the shrinkage cracking of the concrete is regulated and controlled in a targeted manner, and the shrinkage regulation and control effect of the concrete is remarkable.

Description

technical field [0001] The invention relates to the technical field of civil engineering materials, in particular to a composite control system for concrete shrinkage and cracking and a control method thereof. Background technique [0002] With the development of the economy, modern engineering construction has higher requirements on the performance and life of concrete; in addition, as the construction area continues to expand, the service environment of structures is becoming more and more severe. However, modern concrete cracks more seriously and earlier than before, which will cause many engineering quality problems and even accidents, resulting in major economic losses and waste of resources. After the concrete structure cracks, the general components need to be repaired. The crack repair process is complicated and costly, especially the repair effect of penetrating cracks is always difficult to guarantee, and cracks after repair often occur. The main stress-bearing c...

Claims

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Application Information

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IPC IPC(8): E04G21/24C04B28/00C04B40/02
CPCE04G21/246C04B28/00C04B40/02C04B40/0277C04B14/06C04B14/02C04B18/08C04B2103/302C04B22/142C04B22/064C04B24/2652
Inventor 韩宇栋丁小平
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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