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: 2009-08-05
CHINA RAILWAY ERYUAN ENG GRP CO LTD +1
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Problems solved by technology
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: 15.8kg of ordinary Portland cement, 15.8kg of composite modifier, 14.2kg of water, 75.0kg of sand, and 105.0kg of gravel;
[0031] The composite modifier is composed of the following components: 14.35kg II low-calcium fly ash, 0.01kg SJ-2 air-entraining agent, 0.72kg naphthalenesulfonate solid powder water reducer, 0.72kg sodium sulfate. The compounding ratio of the composite modifier is: 100 parts of low-calcium fly ash of class II, 0.1 part of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducer, and 5 parts of sodium sulfate.
Embodiment 2
[0033] The low-strength concrete of the present embodiment is made up of following components:
[0035] The composition of the composite modifier is: 17.71kg II grade low calcium fly ash, 0.02kg SJ-2 air-entraining agent, 0.885kg naphthalene sulfonate solid powder water reducer, 0.885kg sodium sulfate. The compounding ratio of the composite modifier is: 100 parts of high-grade low-calcium fly ash, 0.1 part of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducer, and 5 parts of sodium sulfate.
Embodiment 3
[0037] The low-strength concrete of the present embodiment is made up of following components:
[0039] The composition of the composite modifier is as follows: 14.15kg II grade low-calcium fly ash, 0.02kg SJ-2 air-entraining agent, 0.71kg naphthalene sulfonate solid powder water reducer, 0.42kg sodium borate. The compounding ratio of the composite modifier is: 100 parts of high-grade low-calcium fly ash, 0.12 parts of SJ-2 type air-entraining agent, 5 parts of naphthalene sulfonate solid powder water reducer, 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 SJ-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 in particular relates to a composite modifier and low-strength concrete for concrete retaining structures or foundation treatment engineering containing the composite modifier. Background technique [0002] During the construction of railways and highways, there are a large number of subgrade projects and foundation treatment projects, such as concrete (or chip concrete) supports that are often used to protect the slope surface from erosion by external factors or prevent disasters caused by slope collapse. Structure; cement fly ash gravel (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 self-weight of the wall to resist the earth pressure and prevent the soil from slumping. co...
Claims
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