Shield tunneling machine synchronous grouting material containing recycled fine construction waste powder and preparation method thereof
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A construction waste and synchronous grouting technology, which is applied in the field of construction waste resource treatment and utilization, can solve the problems that the recycled fine powder cannot be used or processed, and achieve the effect of preventing floating, low cost and maintaining stability
Inactive Publication Date: 2018-11-06
河南省建筑科学研究院有限公司 +1
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is: to overcome the problem that the recovered fine powder in the construction waste cannot be used and processed in the prior art, and to provide a shield machine synchronous grouting material containing the recovered fine powder of the construction waste and its preparation method, The fine powder recovered from construction waste is used in the production and preparation of synchronous grouting for shield tunneling to replace fly ash and bentonite in synchronous grouting for shield tunneling, which can improve the stability and fluidity of synchronous grouting and reduce costs. protect environment
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Embodiment 1
[0042] Synchronous grouting material adopts 42.5 ordinary portland cement 80kg, construction waste fine powder 250kg, sodium bentonite 10kg, natural fine sand 710kg, polycarboxylate superplasticizer 0.8kg, hydroxypropyl methyl cellulose ether 0.01kg, Industrial tap water 300kg.
[0043] Experimental results: a, consistency: 115 mm; b, water retention rate: 93%; c, 0.3 MPa after 24 hours; d, 7d strength: 0.8 MPa; e, 28d strength: 2.9 MPa; f, consolidation shrinkage rate 5%; g, decantation rate: 3%.
Embodiment 2
[0045] The synchronous grouting material uses 140kg of 42.5 ordinary Portland cement, 380kg of construction waste fine powder, 50kg of calcium-based bentonite, 940kg of recycled sand, 1.4kg of polycarboxylate superplasticizer, and 0.1kg of hydroxypropyl methyl cellulose ether. Use tap water 450kg.
[0046] Experimental results: a. Consistency: 120mm; b. Water retention rate: 90%; c. 0.57 MPa after 24h; d. 7d strength: 1.22MPa; e. 28d strength: 3.56 MPa; f. Consolidation shrinkage rate 3%; g , Decantation rate: 2%.
Embodiment 3
[0048] 140kg of slaked lime powder, 250kg of construction waste fine powder, 50kg of sodium bentonite, 710kg of natural fine sand, 1.4kg of polycarboxylate superplasticizer, 0.1kg of hydroxypropyl methylcellulose ether, and 450kg of industrial tap water are used for synchronous grouting. kg.
[0049]Experimental results: a. Consistency: 90 mm; b. Water retention rate: 95%; c. 0.27 MPa after 24h; d. Strength at 7d: 0.62 MPa; e. Strength at 28d: 2.82 MPa; f. Consolidation shrinkage rate: 2%; g, decantation rate: 2%.
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Abstract
The invention discloses a shield tunneling machine synchronous grouting material containing recycled fine construction waste powder, which is prepared from the following components: 80kg/m<3> to 140kg/m<3> of cementing material, 250kg/m<3> to 380kg/m<3> of fine construction waste powder, 10kg/m<3> to 50kg/m<3> of bentonite, 710kg/m<3> to 940kg/m<3> of sand, 0.8kg/m<3> to 1.4kg/m<3> of polycarboxylate superplasticizer, 0.01kg/m<3> to 1.0kg/m<3> of cellulose ether and 300kg/m<3> to 550kg/m<3> of water. The sand which is 2.5mm or above in grain size is screened for later use; the cementing material, the fine construction waste powder, the bentonite, the cellulose ether and the sand are weighed according to the proportion and uniformly dry-mixed; the polycarboxylate superplasticizer is weighed, added into the water and uniformly mixed; aqueous solution is added into the powder and uniformly mixed, and thereby the shield tunneling machine synchronous grouting material containing recycled fine construction waste powder is obtained. By replacing fly ash and part of bentonite with the fine construction waste powder, the invention not only can solve the problem on how to treat dust in the process of recycling construction waste, but also can solve the problems of poor fly ash quality or resource scarcity, moreover, the quality of the grouting material can be ensured, the cost is low, and the grouting material is environmentally friendly.
Description
1. Technical field: [0001] The invention relates to a shield machine synchronous grouting material containing recovered fine powder of construction waste and a preparation method thereof, belonging to the technical field of construction waste resource treatment and utilization. 2. Background technology: [0002] With the acceleration of urbanization, the demolition and renovation of the original old residences have produced a large amount of construction waste, such as: waste concrete slag powder, gravel, waste wood, etc., among which concrete, bricks, external wall insulation waste Foam boards account for about 40%-60% of construction waste. The current treatment methods generally use open-air stacking or landfilling. These two methods not only waste resources and destroy the ecological environment, but also occupy land resources that people rely on for survival. Waste resource treatment and utilization has become a major issue in society. [0003] At present, the recyclin...
Claims
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Application Information
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