JPH06271348A - Cement concrete - Google Patents

Abstract

PURPOSE:To provide cement concrete using easily available aggregate without requiring a large crusher. CONSTITUTION:This cement concrete is made of a mixture of 200-700 pts.wt. cement with 100-350 pts.wt. water, 500-610 pts.wt. fine aggregate and 900-1,000 pts.wt. shell chips.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement concrete using a piece of shell as a coarse aggregate.

[0002]

2. Description of the Prior Art Cement concrete is usually manufactured by using gravel as coarse aggregate, that is, mountain gravel or sea gravel. The river gravel is excavated by the dredger from the offshore of the river, and the sea gravel is excavated by an excavator that replaces the dredger. However, the quality of aggregate such as river gravel and sea gravel is gradually decreasing, and it is currently difficult to obtain them.

Therefore, instead of these natural aggregates, crushed stones obtained by crushing rocks to the size of aggregates have been used, which crushes rocks to the size of coarse aggregates. Needed a big crusher. Therefore, it is considered to use a shell such as a scallop for aquaculture that has been discarded as industrial waste as coarse aggregate.

[0004]

However, when a shell is used as coarse aggregate as described above, the strength and slump of cement concrete are greatly influenced by the blending amounts of cement, water, and fine aggregate, so that crushed stone, etc. It was extremely difficult to specify the blending amount in order to achieve the same strength and slump as the cement concrete using as a coarse aggregate. Therefore, the present invention has been made in view of the above problems, and its purpose is to provide an aggregate that is easily available without requiring a large crusher, and has the same strength and slump as cement concrete using crushed stone or the like. Is to provide cement concrete that can be achieved.

[0005]

The cement concrete of the present invention for achieving the above-mentioned objects is cement 20.
0-700 parts by weight, water 100-350 parts by weight, fine aggregate 5
It consists in mixing 00-610 parts by weight and 900-1000 parts by weight of shell pieces.

[0006]

In the present invention, the fine aggregate is sand, and the shell pieces are scallops crushed with an ordinary crusher to a size of 40 mm to 5 mm.
It is possible to achieve strength and slump that are almost the same as those of cement concrete using ordinary crushed stone. When the amount of cement is less than 200 parts by weight, the strength becomes lower than 200 kg / cm ² when trying to obtain a slump larger than 5 cm, and when the amount of cement exceeds 700 parts by weight 350 kg / cm ^2.
Achieve the strength of, but become uneconomical. If the amount of water is less than 100 parts by weight, the slump becomes smaller than 5 cm, and
If the amount exceeds 50 parts by weight, the slump becomes larger than 5 cm, but the amount of cement increases to achieve the same strength, which is uneconomical. Further, if the fine aggregate is less than 500 parts by weight, the slump becomes smaller than 5 cm, and if it exceeds 610 parts by weight, the slump is good, but the use of shell pieces is low and it is uneconomical. Further, when the shell shell content is less than 900 parts by weight, the viscosity increases but it is uneconomical, and when it exceeds 1000 parts by weight, the viscosity decreases and the workability becomes poor.

Therefore, 357 parts by weight of cement, 232 parts by weight of water, 605 parts by weight of fine aggregate and 99 parts of shell fragments.
3 parts by weight of cement concrete can achieve almost the same compressive strength and economy as the cement concrete using crushed stone. That is, when a shell piece is used as the coarse aggregate of cement concrete, the slump is 6.5 to 9c.
m is within the standard slump value (5 to 12 cm: concrete specification) and the strength is 200 kg / cm ^2.
It is possible to obtain cement concrete of up to 350 kg / cm ² .

[0008]

EXAMPLES Examples and comparative examples of the present invention will be described below. Examples 1 to 4 and Comparative Examples 1 to 4 Ordinary Portland cement is used as the cement in Examples 1 to 4 of the present invention, sand from Noboribetsu is used as the fine aggregate, and shell pieces of 20 mm to 40 mm are used as the coarse aggregate. Scallops crushed to the size of were used. As the admixture, Paslic S (trademark) of Fujisawa Pharmaceutical Co., Ltd. was used.

Therefore, the results of slump measurement of green concrete containing the components shown in Table 1 below were as shown in Table 1 below. In addition, the concrete mixed with the components shown in Table 2 below is cured (age 7 days and 2
The results of a compressive strength test conducted on the hardened concrete obtained after 8 days) are as shown in Table 2 below.

[0010]

[Table 1]

[0011]

[Table 2]

According to the present invention, the following effects could be confirmed from the above measurement results.

[0013]

When shell pieces are used as the coarse aggregate, cement concrete having a strength of about 200 to 350 kg / cm ² can be obtained.

The size required as coarse aggregate can be easily obtained without using a large crusher such as crushed stone.

Separation at the time of kneading, driving at the time of curing and curing can be used in the same manner as ordinary concrete.

It is possible to effectively utilize shells such as scallops which have been conventionally discarded as industrial waste.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumiyoshi Tanimoto 4-26-2 Wakakusa-cho, Noboribetsu-shi, Hokkaido

Claims (1)

[Claims] 1. 200 to 700 parts by weight of cement and 10 parts of water
Cement concrete characterized by mixing 0 to 350 parts by weight, 500 to 610 parts by weight of fine aggregate, and 900 to 1000 parts by weight of shell pieces.