JP4608137B2 - Water-proof high-strength roadbed material and soil covering material using granulated blast furnace slag - Google Patents

Description

配合例１及び２とも、材令２８日の１軸圧縮強度は２０．０Ｎ／ｍｍ²以上となり、一般のコンクリートと同等以上の強度を示した。また材令２８日の透水係数は一般的な遮水材料が示す１０^-6ｃｍ／ｓを下回っており、十分な遮水性を発揮することを示した。これらの配合例の混合材は、優れた強度及び遮水特性を示し、高強度、あるいは遮水が必要な路盤および覆土材としての適性を十分に持ち合わせていることがわかる。
【００１２】
【発明の効果】
本発明によれば、高炉水砕スラグの間隙をセメントにて目詰し、かつ結合することにより、遮水性及び高強度を発揮させ得る路盤材および覆土材とすることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roadbed material and a soil covering material, and more particularly to a technique for effectively using blast furnace granulated slag.
[0002]
[Prior art]
Granulated blast furnace slag is obtained by rapidly cooling and granulating molten slag produced in a blast furnace with pressure water, and has a larger gap than natural earth and sand, and a permeability of 10 ⁰ to 10 ^-1 cm / s. Known for being expensive. Moreover, there is a property (latent hydraulic property) that the glassy material of granulated blast furnace slag is dissolved (swelled) and recrystallized by supplying water. Therefore, by utilizing these properties, it has been conventionally used for embankment drainage layer, covering soil, road bed and the like.
[0003]
Japanese Patent Application Laid-Open No. 7-144954 uses a property of this granulated blast furnace slag and mixes granulated blast furnace slag, natural crushed stone, and alkali stimulant, so that it does not impair water permeability even over time. The method of forming is shown.
[0004]
[Problems to be solved by the invention]
However, since blast furnace granulated slag has such properties, it has the disadvantage that it cannot be used as it is in places where water shielding is necessary, such as roadbeds or cover soils such as reservoirs and industrial waste disposal sites. .
[0005]
The present invention solves the above-described problems, and an object thereof is to provide a roadbed material or a soil covering material using blast furnace granulated slag that can be applied to places where water shielding and high strength are required. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the hearth material and the covering material of the present invention are materials for forming a covering portion such as a roadbed of a pavement structure and a reservoir, and the gap of the blast furnace granulated slag is made of cement. It is characterized by exhibiting water shielding and high strength by clogging and bonding, and the contents thereof are as follows.
(1) A water-impervious high strength roadbed material using blast furnace granulated slag, comprising 59 to 67 mass% of blast furnace granulated slag, 18 to 27 mass% of cement, and 14 to 15 mass% of water.
(2) A water-insulating and high-strength soil covering material using blast furnace granulated slag, comprising 59 to 67 mass% of blast furnace granulated slag, 18 to 27 mass% of cement, and 14 to 15 mass% of water.
[0007]
The granulated blast furnace slag is obtained by rapidly cooling and granulating the molten slag produced in the blast furnace with pressure water, and there are some fluctuations in physical characteristics depending on the molten slag temperature, the amount of cooling water, the water pressure, etc. You may use anything.
If the amount of granulated blast furnace slag is too small, it will not be commensurate with cost, and if it is too large, the water shielding property will be lowered. Therefore, the content is desirably 59 to 67% by mass.
[0008]
The cement is a material for clogging and bonding the gaps in the granulated blast furnace slag, and examples thereof include ordinary Portland, blast furnace cement type B, and blast furnace cement type C.
If the amount of the cement is too small, the water shielding property is deteriorated. If the amount of the cement is too large, the cost is increased. Therefore, the content is desirably 18 to 27% by mass.
[0009]
About the said water, in order to add so that the mixed material mentioned later may become the optimal moisture content, the quantity is changed with the natural moisture content of blast furnace granulated slag.
If the amount of water is too small, the hydration reaction is insufficient and a sufficient density cannot be secured. If the amount is too large, the particles are not sufficiently contacted with each other and are difficult to bind and harden, so the content is 14-15. The mass% is desirable.
[0010]
【Example】
Blast furnace granulated slag 67% by weight (hereinafter referred to simply as%) and blast furnace cement B type 18% were mixed in a mixing plant, and after further adding 15% water, they were kneaded again to obtain Formulation Example 1. It was. Further, 59% of granulated blast furnace slag and 27% of blast furnace cement type B 27% were mixed in a mixing plant, and 14% of water was further added thereto, and then kneaded again to obtain Formulation Example 2.
[0011]
The mixed material thus obtained was subjected to a compaction test (JIS A 1210), a water permeability test (constant water level), and a uniaxial compression test. That is, as a water permeability test, in accordance with JIS A 1218, 2,096 g of each of the mixed materials of Formulation Examples 1 and 2 was placed in a container having an inner diameter of 10.0 cm, a length of 12.7 cm, and a volume of 1,000 cm ³ , and 2.5 kg. A test specimen was prepared by using 30 mm of the faller and dropped to a height of 30 cm and 25 times / 3 layers, and immersed in tap water from above and below the sample. Moreover, as a uniaxial compression test, the values on the 7th and 28th days of the age were measured in the case of a compaction degree of 95% by a method based on JIS A 5015. The test results are shown in Table 1.
[Table 1]

In both Formulation Examples 1 and 2, the uniaxial compressive strength on the 28th day of material age was 20.0 N / mm ² or more, which was equal to or higher than that of general concrete. Further, the permeability coefficient on the 28th of the material age was lower than 10 ⁻⁶ cm / s indicated by a general water shielding material, indicating that it exhibited sufficient water shielding properties. It can be seen that the mixed materials of these blending examples exhibit excellent strength and water shielding properties, and have sufficient strength as roadbed and soil covering materials that require high strength or water shielding.
[0012]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it can be set as the roadbed material and soil covering material which can exhibit water-imperviousness and high intensity | strength by clogging the gap | interval of granulated blast furnace slag with cement, and couple | bonding together.

Claims (2)

  A water-proof high-strength roadbed material using blast furnace granulated slag comprising 59 to 67 mass% of blast furnace granulated slag, 18 to 27 mass% of cement, and 14 to 15 mass% of water.   A water-impervious, high-strength soil covering material using blast furnace granulated slag comprising 59 to 67 mass% of blast furnace granulated slag, 18 to 27 mass% of cement, and 14 to 15 mass% of water.