High-titanium heavy slag fine aggregate concrete

Abstract

The invention discloses high-titanium heavy slag fine aggregate concrete, which is prepared from the following raw materials in parts by weight: 200 to 400 parts of cement, 150 to 170 parts of water, 600 to 900 parts of high-titanium heavy slag sand, 1000 to 1150 parts of gravel, 40 to 60 parts of fly ash and 50 to 80 parts of mineral powder. The addition amount of the water reducing agent is 1.9-2.4% of the total mass of the cement, the fly ash and the mineral powder; the addition amount of the water-retaining agent is 5-7% of the total mass of the cement, the fly ash and the mineral powder; the addition amount of the air entraining agent is 0.2-0.3% of the total mass of the cement, the fly ash and the mineral powder. According to the invention, only the high-titanium heavy slag sand is adopted as concrete fine aggregate, the problems of resource shortage and environmental pollution are solved, an effective way is found for treatment of industrial high-titanium heavy slag, environmental pollution caused by stacking of the high-titanium heavy slag is reduced, and the high-titanium heavy slag concrete has very high social benefits and economic benefits; the high-titanium heavy slag fine aggregate concrete is good in wrapping property and free of bleeding, and the pressure bleeding rate is smaller than 9%.

Description

Technical Field

[0001] The invention relates to a method for preparing concrete, in particular to a method for preparing high-titanium heavy slag fine aggregate concrete. Background Art

[0002] Panzhihua Iron and Steel Co., Ltd.'s high-titanium heavy slag is a dense slag formed by natural cooling or hot pouring of blast furnace slag produced during the smelting of vanadium-titanium magnetite in the air. Its TiO2 content is about 20% higher than that of ordinary blast furnace slag. The slag contains 50-65% of titanium pyroxene, 10-25% of perovskite and other minerals with excellent stability. Panzhihua Iron and Steel Co., Ltd. has more than 55 million tons of high-titanium slag that has not been used so far. It occupies thousands of acres and the slag discharge volume increases by 3 million tons every year. Panzhihua Iron and Steel Co., Ltd. is facing a situation where there is no place to discharge slag. On the other hand, Panzhihua City consumes a large amount of crushed stone and sand every year. Excessive development has destroyed natural vegetation and caused soil erosion. Whether high-titanium slag can be comprehensively utilized not only affects the sustainable development of the social economy of Panzhihua Iron and Steel Co., Ltd. and Panzhihua, but also has important significance for saving natural resources, reducing engineering costs, and protecting the ecological environment of the upper reaches of the Yangtze River.

[0003] The fineness modulus of high titanium heavy slag fine aggregate is between 2.0-2.6, and the apparent density is between 3200-3300kg / m 3 The powder content is generally between 8% and 15%, and the apparent density of fine powder is between 3400 and 3500 kg / m 3 At the same time, the concrete mixture using high-titanium heavy slag fine aggregate has poor encapsulation and is prone to water seepage, and the concrete using high-titanium heavy slag fine aggregate loses workability quickly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-titanium heavy slag fine aggregate concrete to improve the concrete encapsulation and water seepage problems.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a high-titanium heavy slag fine aggregate concrete, comprising the following raw materials in parts by weight: 200-400 parts of cement, 150-170 parts of water, 600-900 parts of high-titanium heavy slag sand, 1000-1150 parts of crushed stone, 40-60 parts of fly ash, and 50-80 parts of mineral powder; and also comprising admixtures, the admixtures comprising a water reducing agent, a water retaining agent and an air entraining agent; the addition amount of the water reducing agent is 1.9%-2.4% of the total mass of cement, fly ash and mineral powder; the addition amount of the water retaining agent is 5%-7% of the total mass of cement, fly ash and mineral powder; the addition amount of the air entraining agent is 2‰-3‰ of the total mass of cement, fly ash and mineral powder.

[0006] A high-titanium heavy slag fine aggregate concrete comprises the following raw materials in parts by weight: 200-380 parts of cement, 155-165 parts of water, 700-860 parts of high-titanium heavy slag sand, 1000-1100 parts of crushed stone, 50-60 parts of fly ash, and 60-70 parts of mineral powder; the added amount of the water reducer is 2.4% of the total mass of cement, fly ash and mineral powder; the added amount of the water retaining agent is 6% of the total mass of cement, fly ash and mineral powder; and the added amount of the air entraining agent is 2‰ of the total mass of cement, fly ash and mineral powder.

[0007] Furthermore, the high titanium heavy slag sand has a fineness modulus of 2.4 and an apparent density of 3215 kg / m 3 , powder content is 9.6% and porosity is 47%.

[0008] Furthermore, the gravel is common gravel.

[0009] Furthermore, the cement is ordinary Portland cement.

[0010] The beneficial effects of the present invention are as follows: the present invention only uses high-titanium heavy slag sand as concrete fine aggregate, while solving the problems of resource shortage and environmental pollution, finding an effective way to treat industrial high-titanium heavy slag, reducing the environmental pollution caused by the stacking of high-titanium heavy slag, and having very high social and economic benefits; the high-titanium heavy slag fine aggregate concrete of the present invention has good encapsulation, does not bleed water, and the pressure water bleeding rate is less than 9%. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with embodiments.

[0012] Embodiment 1:

[0013] (1) Weighing: Raw materials in parts by weight: 200 parts of cement, 170 parts of water, 856 parts of high-titanium heavy slag sand, 1049 parts of crushed stone, 60 parts of fly ash, and 60 parts of mineral powder; the amount of the water reducer, water retainer and air entraining agent is 1.9%, 6% and 2‰ of the total mass of cement, fly ash and mineral powder; ordinary silicate cement is selected for cement, polycarboxylate water reducer is selected for water retainer, dispersible latex powder is selected for water retainer, and sodium dodecylbenzene sulfonate is selected for air entraining agent; the fineness modulus of high-titanium heavy slag sand is 2.4, and the apparent density is 3215 kg / m 3 , powder content is 9.6%, porosity is 47%;

[0014] (2) Mixing and forming: Mix the components and raw materials in the proportions described in step (1) for 2 minutes, test the relevant performance indicators, and then mold and compact them by vibration to obtain a concrete test block;

[0015] (3) The test block in step (2) is placed in an environment with a temperature of 18° C. and a humidity of ≥ 95% for curing for 1 day and then demolded. The demolded concrete test block is placed in an environment with a temperature of 18° C. and a humidity of ≥ 95% and continues to be cured until the age of 28 days.

[0016] Embodiment 2:

[0017] (1) Weighing: Raw materials by weight: 380 parts of cement, 157 parts of water, 700 parts of high-titanium heavy slag sand, 1100 parts of crushed stone, 50 parts of fly ash, and 70 parts of mineral powder; the amount of the water reducer, water retainer and air entraining agent is 2.4%, 6% and 2‰ of the total mass of cement, fly ash and mineral powder; ordinary silicate cement is selected for cement, polycarboxylate water reducer is selected for water retainer, dispersible latex powder is selected for water retainer, and sodium dodecylbenzene sulfonate is selected for air entraining agent; the fineness modulus of high-titanium heavy slag sand is 2.4, and the apparent density is 3215 kg / m 3 , powder content is 9.6%, porosity is 47%;

[0018] (2) Mixing and forming: Mix the components and raw materials in the proportions described in step (1) for 3 minutes, test the relevant performance indicators, and then mold and compact them by vibration to obtain a concrete test block;

[0019] (3) The test block in step (2) is placed in an environment with a temperature of 22° C. and a humidity of ≥95% for curing for 1 day and then demolded. The demolded concrete test block is placed in an environment with a temperature of 22° C. and a humidity of ≥95% and continues to be cured until the age of 28 days.

[0020] The preparation methods of Comparative Examples 1 to 7 are the same as those of Example 1, and the specific raw material ratios are shown in Table 1:

[0021] Table 1 Raw material ratio of high titanium heavy slag fine aggregate concrete

[0022]

[0023]

[0024] The raw materials were weighed according to the proportions in Table 1 to prepare high-titanium heavy slag fine aggregate concrete, and the performance of the concrete was tested, as shown in Table 2.

[0025] Table 2 Performance test of high titanium heavy slag fine aggregate concrete

[0026]

[0027] It can be seen from Table 2 that in Comparative Examples 1 and 2, no water-retaining agent and air-entraining agent were added, resulting in poor encapsulation and severe water bleeding; in Comparative Example 3, only water-retaining agent was added without air-entraining agent, the water bleeding rate was reduced, but the encapsulation was poor; in Comparative Example 6, when the amount of water-retaining agent was 8%, the amount of water-reducing agent was significantly increased, and the fluidity of the concrete deteriorated; in Comparative Example 6, when the amount of air-entraining agent was 5‰, the amount of water-reducing agent was significantly increased, and the fluidity of the concrete deteriorated; in Comparative Example 7, when the amount of water-retaining agent was 8%, the amount of water-reducing agent was significantly increased, and the fluidity of the concrete deteriorated.

Claims

1. A high-titanium heavy slag fine aggregate concrete, characterized in that: The invention comprises the following raw materials in parts by weight: 200-400 parts of cement, 150-170 parts of water, 600-900 parts of high-titanium heavy slag sand, 1000-1150 parts of crushed stone, 40-60 parts of fly ash and 50-80 parts of mineral powder; and further comprises admixtures, which include water reducing agent, water retaining agent and air entraining agent; the addition amount of the water reducing agent is 1.9%-2.4% of the total mass of cement, fly ash and mineral powder; the addition amount of the water retaining agent is 5%-7% of the total mass of cement, fly ash and mineral powder; the addition amount of the air entraining agent is 2‰-3‰ of the total mass of cement, fly ash and mineral powder.

2. The high-titanium heavy slag fine aggregate concrete according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 200-380 parts of cement, 155-165 parts of water, 700-860 parts of high-titanium heavy slag sand, 1000-1100 parts of crushed stone, 50-60 parts of fly ash and 60-70 parts of mineral powder; the amount of the water reducing agent added is 2.4% of the total mass of cement, fly ash and mineral powder; the amount of the water retaining agent added is 6% of the total mass of cement, fly ash and mineral powder; the amount of the air entraining agent added is 2‰ of the total mass of cement, fly ash and mineral powder.

3. The high-titanium heavy slag fine aggregate concrete according to claim 1, characterized in that: The high titanium heavy slag sand has a fineness modulus of 2.4 and an apparent density of 3215 kg / m 3 , powder content is 9.6% and porosity is 47%.

4. The high-titanium heavy slag fine aggregate concrete according to claim 1, characterized in that: The crushed stone is common crushed stone.

5. The high-titanium heavy slag fine aggregate concrete according to claim 1, characterized in that: The cement is ordinary Portland cement.

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