Composite modifying agent and low-strength concrete prepared thereby
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A composite modifier, low-strength technology, applied in the field of building materials, can solve the problems of high price and not easy to obtain, and achieve the effect of ensuring durability, significant economy, and improving resistance to environmental water erosion
Active Publication Date: 2012-07-04
CHINA RAILWAY ERYUAN ENG GRP CO LTD +1
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In order to improve the corrosion resistance of cement concrete against sulfate-type environmental water, sulfate-resistant cement is generally used at home and abroad to prepare concrete. The mineral composition of sulfate-resistant cement is different from that of ordinary Portland cement. The content of C3A and C3S in sulfate-resistant cement clinker It needs to be made with a specific ratio of raw materials, so the price of this cement is relatively expensive, and it is not easy to obtain in the market
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Embodiment 1
[0030] The low-strength concrete of this embodiment is composed of the following components: ordinary Portland cement 15.8kg, composite modifier 15.8kg, water 14.2kg, sand 75.0kg, and crushed stone 105.0kg;
[0031] The composite modifier is composed of the following components: 14.35kg II grade low calcium fly ash, 0.01kg SJ-2 type air-entraining agent, 0.72kg part of naphthalene sulfonate solid powder water reducing agent, 0.72kg part of sodium sulfate. The proportion of the composite modifier is: 100 parts of grade II low calcium fly ash, 0.1 part of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducing agent, and 5 parts of sodium sulfate.
Embodiment 2
[0033] The low-strength concrete of this embodiment consists of the following components:
[0034] Ordinary Portland cement 13.0kg, compound modifier 19.5kg, water 13.6kg, sand 73.0kg, crushed stone 107.0kg;
[0035] The composition of the composite modifier is: 17.71kg II grade low calcium fly ash, 0.02kg SJ-2 type air-entraining agent, 0.885kg part of naphthalene sulfonate solid powder water reducing agent, 0.885kg part of sodium sulfate. The proportion of the composite modifier is: 100 parts of grade low calcium fly ash, 0.1 part of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducing agent, and 5 parts of sodium sulfate.
Embodiment 3
[0037] The low-strength concrete of this embodiment consists of the following components:
[0038] Ordinary Portland cement 15.3kg, composite modifier 15.3kg, water 13.7kg, sand 73.5kg, crushed stone 109.0kg;
[0039] The composition of the composite modifier is: 14.15kg II grade low calcium fly ash, 0.02kg SJ-2 type air-entraining agent, 0.71kg part of naphthalene sulfonate solid powder water reducing agent, 0.42kg part of sodium borate. The proportion of the composite modifier is: 100 parts of grade low calcium fly ash, 0.12 parts of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducing agent, and 3 parts of sodium borate.
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Abstract
The invention discloses a composite modifier and environment water corrosion resistant low-intensity level concrete prepared from the same for slope protection and reinforcement engineering and roadbed processing engineering. The composite modifier comprises 100 portions of fly ash, 0.05 to 0.2 portion of SI-2 type nonionic air-entraining component, 1 to 10 portions of naphthalene sulfonate water reducing component, 1 to 10 portions of sodium sulfate or sodium borate setting time adjusting component, and the like. The concrete consists of silicate cement, a modifier, stones and water. The composite modifier can optimize hydrate product compositions of cement stones in the concrete, and introduce tiny closed air holes to the concrete so as to improve the pore structure thereof and improve the workability, and the like of the concrete, thereby remarkably improving the durability of the slope protection and reinforcement engineering and the roadbed processing engineering. The composite modifier has the advantage that the concrete prepared from the compound modifier has excellent environment water corrosion resistance and can remarkably reduce the cost of a construction project under the condition of satisfying the requirement on low design strength level.
Description
technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a composite modifier and a concrete supporting structure containing the composite modifier or low-strength concrete for foundation treatment engineering. Background technique [0002] In the process of railway and highway construction, there are a large number of subgrade works and foundation treatment works, such as concrete (or rubble concrete) supports that are often used to protect the slope surface from the erosion of external factors or to prevent disaster accidents caused by slope collapse. Structure; cement fly ash crushed stone (CFG) pile foundation used to improve the bearing capacity of the foundation, etc. These projects can meet the requirements by using low-strength grade concrete materials. For example, the gravity retaining wall is a retaining structure that relies on the wall's own weight to resist the earth pressure and prevent the soil fr...
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