JPS60246280A - Cement composition and manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides light and heavy concrete cured products, lightweight heat insulating materials;
The present invention relates to a cement composition suitable for manufacturing structures, etc., and a method for manufacturing the same.

[Description of Technical Field] In recent years, the usage of light-lit mortar or concrete containing lightweight aggregate has been rapidly increasing in various fields.

For example, when such lightweight concrete mixes or light M mortar (hereinafter simply referred to as light star concrete mixes) are used in the manufacture of structures, they can reduce the total weight of the structures. This is advantageous in that it can reduce foundation construction costs, and it is also advantageous in terms of energy conservation because the lightweight hardened concrete has heat insulating properties.

Light +11 concrete mix is generally prepared by mixing cement, light aggregate, and optionally fine aggregate with water. As for lightweight aggregates, sawdust, perlite, etc. were used in fortune telling, but in Tsuzumichika, lightweight aggregates made of synthetic resin foams such as polystyrene foam and polyurethane foam are also often used.

[Problems with the prior art] In general, lightweight concrete using synthetic resin foam as lightweight aggregate) In the case of Ml mix, it is very difficult to knead lightweight aggregate and cement etc. due to the large difference in specific gravity between the two. In addition, there is a problem that the stability of the dispersion in the prepared crosstalk material is poor.

Additionally, since a large amount of water is required for cross-conducting, there are many other problems, including the tendency for a water separation phenomenon called "water floating" to occur after installation.

In addition, when a light star concrete mix obtained by kneading a cement composition containing this type of lightweight aggregate is used for structures or construction, for example, it is generally placed by pumping it. In such cases, it is necessary that the lightweight concrete mixture has high fluidity. This type of lightweight aggregate used in the preparation of highly fluid lightweight concrete mixes is used to create air gaps (
Foamed resin beads, especially expanded polystyrene beads, are preferred from the viewpoint of the amount of air entrained in the beads and their water absorption.

In other words, foamed resin beads, especially foamed polystyrene beads, which have a smooth surface, have extremely low water absorption, and have an appropriate amount of air entrained during pumping are used as lightweight concrete beads.
・Generally used as a lightweight aggregate for kneading,
When expanded polystyrene beads are used, the problems of lightweight aggregates, such as being extremely difficult to knead with cement and having poor stability after kneading, still remain.

In order to solve the problems when mixing lightweight concrete containing this type of lightweight aggregate, for example, a (polymer) substance with caking and water retention properties such as polyvinyl alcohol and glass # Jl1m etc.
Attempts have been made to prepare a lightweight concrete U mix by mixing a "binder", but originally, such improvements were made with the focus on the strength of the hardened concrete. As a result, it is said that the stability of concrete (1) and the kneaded product is improved, but in reality, it has little effect on the difficulty of kneading cement and foamed synthetic resin beads.

A method has also been proposed in which foamed synthetic resin beads, which are lightweight aggregates, are coated in advance with a hydrate such as gypsum cement. This method improves the stability of mixed mixed concrete hardened concrete mixture by increasing the affinity between foamed synthetic resin beads and cement i. However, this coating process requires a complicated operation, and furthermore, the foamed synthetic resin beads and hydrates such as gypsum cement inherently have poor affinity, and when coating, hydrates of gypsum cement, etc. Problems remain, including that it is extremely difficult to uniformly coach materials throughout the foamed synthetic resin beads. Furthermore, even if the coating is uniform, the dispersibility is not necessarily good.

In order to overcome the drawbacks of lightweight concrete containing foamed synthetic resin, etc., Japanese Patent Publication No. 54-27368 discloses that by using additives consisting of bituminous substances and surfactants, it is possible to improve There is a disclosure that the dispersibility of foamed polystyrene particles (beads) can be improved. In other words, this bituminous material has the effect of softening the surface of lightweight aggregate such as expanded polystyrene particles and increasing the bonding of surrounding cement particles, so it has the effect of helping to stabilize the resulting dispersion, and Surfactants have been shown to aid in the dispersion of the expanded polystyrene particles.

However, this additive consisting of a bituminous substance and a surfactant cannot be said to have sufficient dispersion ability on its own when used, and also tends to aggregate when added to wood. If you do so, your ability to separate will be significantly reduced.

[Object of the invention] The present invention aims to improve the dispersibility of an additive composition containing a bituminous substance and a surfactant, which has a tendency to agglomerate when added to water and is said to have difficulty in forming square crystals. This is improved by using an anti-caking agent in combination, which improves the dispersibility of the expanded polystyrene beads used as the M Iglil material, making it easier to mix wires, and improving workability during kneading. An object of the present invention is to provide a cement composition and a method for producing the same.

Another object of the present invention is to provide a cement composition suitable for the preparation of light and heavy concrete (WJ) kneaded material suitable for pouring by pumping, which requires high fluidity, and a method for producing the same.

Another object of the present invention is to provide a cement composition that is particularly suitable for use as a building material for structures or buildings by using expanded polystyrene beads as a lightweight aggregate, and a method for producing the same. shall be.

[Practical Purpose of the Invention] The present invention provides (I) cement, (■) expanded polystyrene beads with a volume ratio of 1.5 to 45 times the volume of cement, (III) and 0.18 to 45, respectively, with respect to cement.
Cement composition characterized in that it comprises 1.05% of heavy acid surfactant, 0.04-0.45% of heavy acid bituminous material and 0.03-0.85% by weight of anti-caking agent It provides:

And the cement composition described in 1- is as follows.

[I] Cement, [III] Expanded polystyrene beads of 1.5 to 4.5 times the volume ratio to the cement, and 1) and surface activity of 0.18 to 1.05 times the electrolysis, respectively, to the cement. agent, 0.04-0
．． Preferably, it is produced by a method of mixing a premix consisting of 45% by weight of bituminous material and 0.03-0.85% of heavy acid anti-caking agent.

Diatoms are particularly suitable as anti-caking agents for use in the cement compositions of the present invention.

[Effects of the Invention] The cement l-m+ composition of the present invention allows expanded polystyrene beads to be extremely easily dispersed in the cement when water is added and kneaded, and the resulting concrete) The stability of the expanded polystyrene beads in the ML kneaded product is also extremely good.

The light I-concrete mixture of the cement composition of the present invention exhibits high wave properties and is particularly suitable for pumping operations performed during the construction and construction of buildings, structures, etc. .

That is, by using the cement composition of the present invention, lightweight concrete 1-'JJ+'=24 to 27 cm, which is a preferable slump value for kneading, that is, a slump value of 24 cm or more, which is suitable for pumping operation, can be easily achieved.
It is possible to prepare a lightweight concrete mix having a slump value of 27 cm or more, which is less than 27 cm.

Furthermore, the thermal conductivity of light concrete prepared using the cement composition of the present invention is 0120 kcal/sh.
'0 or less, and is suitable as a heat insulating material for structures or buildings.

[Detailed Description of the Invention] The cement that can be used in the present invention is not particularly limited as long as it is a common cement, but usually Portland cement.The lightweight aggregate used in the present invention is expanded polystyrene beads. Since the expanded polystyrene beads have a smooth surface, they have almost no water absorption, and even when pressure is applied during pumping, the beads hardly absorb water. Therefore, the physical properties before and after pumping, especially the slump value, hardly change.

The expanded polystyrene beads used in the present invention generally have a particle size of 18 mm or less, usually 1 to 6 mm.

By using expanded polystyrene beads with this particle size, air entrainment is especially possible during pumping! a is appropriate, and therefore less likely to cause a decrease in compressive strength after curing.

1 The blending ratio of expanded polystyrene beads to cement is
It is necessary to set the amount to 1.5 to 4.5 times the volume of cement used. If the blending ratio is less than 1.5 times the amount, the ffi[i per unit volume will increase and the thermal conductivity will also be 1 hq, resulting in a decrease in insulation properties.On the other hand, if the blending ratio is more than 4.5 times the amount, the strength will decrease. However, the fluidity decreases, making pumping difficult, which is not preferable.

The surfactant can be appropriately selected from surfactants that have been conventionally used in the preparation of concrete or have been proposed for use.

Examples of such surfactants include alkylaryl sulfonates, such as alkylnaphthalene sulfonates;
Anionic surfactants such as formaldehyde condensates of naphthalene sulfonates, alkyl sulfonates, lignosulfonic acid saponified resins, sodium polycarbonate; quaternary ammonium salts such as laurylpyridinium chloride and methyloctadecyl ammonium bromide, etc. and cationic surfactants such as secondary amines; and nonionic surfactants such as aliphatic alcohols or condensates of phenol and ethylene oxide. These surfactants may be used alone or in combination, or may be used in combination with surfactants other than those listed above. A preferred surfactant is a mixture of formaldehyde condensate of naphthalene sulfonate and sodium polycarboxylate.

The bituminous substance can be appropriately selected from commonly used bituminous substances, but it is preferable to use asphalt, coal tar, and related substances that are low in viscosity, low in viscosity, and have a low softening point. It is preferable to use Particularly preferred bituminous materials include dark thermoplastic resins of polycyclic hydrocarbon polymers derived from petroleum.

The anti-caking agent used in the present invention is preferably a fine powder, powder, or granular material that has no substantial reactivity with other ingredients. Examples of anticaking agents include diatomaceous, calcium carbonate, microsilica, fly ash, and the like. It is especially preferable to use a diatomaceous surface.

Surfactants, bituminous substances and anti-caking agents are respectively 0, 18 to 1.0 for cement and surfactants
5% by weight, 0.04% to 0.45% by weight for bituminous substances and 0.03% to 0.85% by weight for anticaking agents.

The cement composition of the present invention can be produced, for example, as follows.

First, a surfactant and a bituminous substance are mixed, and an anti-caking agent is further added thereto to form an additive premix containing an anti-caking agent.

When preparing an additive premix containing an anti-caking agent, the composition is as follows: 0.1 of the surfactant per cement.
It is necessary to adjust to 8-1.05% by weight of bituminous material, 0.04-0.45% by weight of bituminous material, and 0.03-0.85 deuterate anticaking agent.

In addition, when preparing the additive premix in advance, 62.5 to 87.5 fK amount % of the surfactant and 12.5 to 37.5 weight % of the bituminous material are mixed 1, and then each is added to the cement. Preparing an anti-caking agent-containing additive premix by mixing 0.3-1.2% by weight of the additive composition and 0.03-0.85% by weight of an anti-caking agent. is desirable.

The anticaking agent-containing additive premix thus prepared is mixed with cement and expanded polystyrene beads to form a cement composition.

There are no particular restrictions on this mixing method, and any known mixing method may be used.

By preparing an additive premix containing an anti-caking agent in advance and mixing it with cement in this way, the additive premix can be uniformly dispersed in the cement composition.
This is preferable because it facilitates kneading with the addition of wood.

Another method is to disperse the above additive premix containing an anticaking agent in a small amount of water, add and mix expanded polystyrene beads to this dispersion, and apply the additive premix containing an anticaking agent to the surface of the beads. It is also possible to use a method in which cement is added and mixed after adhesion and drying.

Moreover, fine aggregate can also be blended into the cement composition of the present invention. The fine aggregate that can be blended is not particularly limited as long as it is commonly used, but common sand or the like with a particle size of 5 mm or less is generally used.

Furthermore, as fine aggregates, in addition to the ordinary sand listed in F, asbestos, mis-types such as glass fiber and nylon fiber, artificial lightweight sand, and crushed calcium carbonate can be used alone or in combination, or mixed with ordinary sand. You can also use

The cement of the present invention]-mixing of the composition is carried out in a conventional manner.

There are no particular restrictions on the method of mixing concrete using the cement composition of the present invention, and a conventional cement mixer,
This can be carried out by adding and kneading a predetermined amount of water and, if desired, aggregate or fine aggregate to a cement composition using a mortar mixer or the like.

5 In the concrete mixture obtained by kneading in this way, expanded polystyrene beads are uniformly dispersed throughout,
Further, there is almost no formation of lumps of bituminous material, and cross-wire work can be easily carried out.

Next, Examples and Comparative Examples of the present invention will be shown.

Note that the measured values shown in the Examples and Comparative Examples were measured according to the following method.

(1) Slump value JIS-A-1101 (2) 1st place Volume weight JIS-A-1116 (3) Thermal conductivity JIS
-A-1412 (Plat Comparison Method) 76.5 parts by weight of a sodium naphthalene sulfonate formaldehyde composite and 16.1 parts of a bituminous material were kneaded with a mixer until uniform. Further, 7.4 parts by weight of sodium polycarboxylate was added to the mixture described in -1- above, and mixing was continued until the mixture became uniform as a whole to obtain an additive composition.

In addition, in the examples and comparative examples described below, The additive composition used is as described above.

[Example 1] Additive composition 99.5 g (surfactant amount relative to cement weight: 0.557% by weight, bituminous material amount: 0.107
weight%) and 28g of diatomaceous material (0.0% relative to cement weight).
187% by weight) was put into a mixer to form a mixture of the additive composition and the diatomaceous mixture (additive premix containing anti-caking agent).
I got it. This anti-caking agent-containing additive premix was added to 15 kg (1, OL) of cement while stirring, and expanded polystyrene beads (particle size 1-6 mm, the expanded polystyrene beads used below are similar to this) were added to 15 kg (1, OL) of cement. be)
Added 30 sentences. Then, the mixture was mixed until the whole was homogeneous to prepare a cement composition.

The obtained cement composition was transferred to a mortar mixer, 8 kg of water was added, and mixed for 3 minutes to prepare a lightweight concrete mixture.

When the above lightweight concrete mixed material was observed, expanded polystyrene beads were uniformly dispersed throughout, and no separation of expanded polystyrene beads and water was observed.

The slump value of this lightweight concrete mixture is 26.0c
m, and the unit volume weight of the cured product produced using this kneaded product was 0.502 kg/h, and the thermal conductivity was 0.
, 094 kcal/mh°C.

[Example 2] Same as in Example 1 except that the additive composition was changed to Bog (surfactant I: 0.336 ton 51%, bituminous substance amount: 0.064% by weight based on cement weight). A cement composition was prepared by operation.

B1) The prepared cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this I\Kame concrete kneaded product was observed, expanded polystyrene beads were uniformly dispersed throughout, and no separation of expanded polystyrene beads and water was observed.

The slump value of this eaves concrete mix is 924.5 cm, the unit volume weight of the cured product manufactured using this mix is 0.520 kg, and the thermal conductivity is 0.105 kcal/mh'. It was c.

[Example 3] Example 1 except that the additive composition was 165 g (surfactant 5 (: 0.923% by weight, relative to the weight of cement: 0.177% by weight)) A similar procedure was carried out to prepare a Yamen].M1 product.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this Hm concrete kneaded product was observed, expanded polystyrene beads were uniformly dispersed throughout, and no separation of expanded polystyrene beads and water was observed.

Slumpy/1 of this lightweight concrete mixture is 26.
5 cm, and the unit volume weight of the cured product produced using this kneaded material is 0.499 kg0/9, and the thermal conductivity is 0, lOOkcal/mh'
It was o.

[Example 41 A cement composition was prepared in the same manner as in Example 1 except that the amount of Diatomite was changed to 6 g (+0.040% by weight based on the cement electric lamp).

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this light concrete mixture was observed, expanded polystyrene beads were uniformly dispersed throughout, and no separation of expanded polystyrene beads and water was observed.

The slump value of this eaves gutter concrete mixture is 26.0c
m, and the unit volume of the cured product produced using this mixed material is 0.505 kgZ, and the thermal conductivity is 0.
, 096 kcal/ah''C.

[Example 5] A cement composition was prepared in the same manner as in Example 1 except that 120 g (=0.8 wt % based on the cement weight) of the star "diatom" was used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this lightweight concrete mixture was observed, it was found that the expanded polystyrene beads were uniformly distributed throughout, and no separation of expanded polystyrene beads and water was observed.

This light concrete 1 - slump point 1 of the mixer is 26
．． 2 cm, and the unit volume weight of the cured product produced using this kneaded product was 0.500 kg/m, and the thermal conductivity was 0.094 kcal/mh'c.

[Example 6] 14 of the expanded polystyrene beads in Example 1 were replaced with 20
A cement composition was prepared in the same manner except that the amount was increased twice as compared to the cement composition.

The mixed cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this light 1a concrete kneaded product was observed, it was found that the expanded polystyrene beads were almost uniformly dispersed throughout, and no separation of expanded polystyrene beads and water was observed.

The slump value of this lightweight concrete mixture is 27.0c
m, and the unit volume weight of the cured product produced using this kneaded product is 0.545 kg/liter, and the thermal conductivity is O,
It was l l Okcal/mh'o.

[Example 7] A cement composition was prepared in the same manner as in Example 1, except that the amount of expanded polystyrene beads was 40 m (4 times M relative to the cement volume).

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixed for 3 minutes to prepare a lightweight concrete mixture.

3 When this lightweight concrete kneaded product was observed, it was found that the expanded polystyrene beads were uniformly separated throughout, and no separation of expanded polystyrene beads and wood was observed.

The slump value of this lightweight concrete mixture is 24.5c
m, and the unit volume of the hardened product produced using this kneaded product is 0.450 kgZ, and the thermal conductivity is 0.
, 080 kcal/ih°C.

[Example 8] A cement composition was prepared in the same manner as in Example 1, except that 28 g of calcium carbonate fine powder (1% to the cement weight: 0.187%) was used instead of diatomaceous material. .

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added and kneaded for 3 minutes to obtain lightweight concrete 1.
A kneaded product was prepared.

When this light warm concrete mixture was observed, it was found that the expanded polystyrene beads were uniformly dispersed throughout, and no separation of the expanded polystyrene beads and water 4 was observed.

The slump value of this lightweight concrete Ln mixture is 25.8.
cm, and the median volumetric weight of the cured product produced using this kneaded product is 0.505 kg/cm, and the thermal conductivity is 0.
, 097 kcal/+h'O.

[Comparative Example 1] A cement composition was prepared in the same manner as in Example 1 except that Diatom 1: was not used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete stave.

When this lightweight concrete mixed material was observed, no separation was observed, but it could be said that the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete mixture is as low as 18.5 cm, and the unit volume weight of a cured product manufactured using this mixture is 0.555 kg/
The thermal conductivity was 0.160 kcal/mhO.

This lightweight concrete mixture has a low slump value, making it unsuitable for pumping, and the cured concrete manufactured using this mixture also has high thermal conductivity, so it cannot be used for structures or buildings. It was profitable.

[Comparative Example 2J A cement I composition was prepared in the same manner as in Example 2 except that diatomaceous material was not used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixing was performed for 3 minutes to prepare a lightweight concrete mixer.

When this lightweight concrete kneaded product was observed, no separation was observed, but the expanded polystyrene beads were not sufficiently dispersed.

The slump value of this lightweight concrete mixture is 15.2c
m, and the unit volume of the hardened product produced using this kneaded product is 0.576 kg/cm, and the thermal conductivity is 0.
, 200 kcal/mh"c.

This lightweight concrete mixture has a low slump value, making it unsuitable for pumping, and the cured concrete manufactured using this mixture also has high thermal conductivity, so it cannot be used for structures or buildings. It was a disadvantage.

[Comparative Example 3] A cement composition was prepared in the same manner as in Example 3 except that Diatomite was not used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixed for 3 minutes to prepare a lightweight concrete mixture.

When this lightweight concrete kneaded product was observed, no separation was observed, but the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete mixture is as low as 20.0 cm, and the unit volume weight of a cured product manufactured using this mixture is 0.519 kg/cm, and the thermal conductivity is 0.110 kcal/mh. It was 'o.

This lightweight concrete mix has a low slump value of 7. This made it unsuitable for pumping.

[Comparative Example 4] A cement composition was prepared in the same manner as in Example 6 except that Diatomite was not used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this lightweight concrete kneaded product was observed, no separation was observed, but the expanded polystyrene beads were not sufficiently dispersed.

The slump value of this lightweight concrete mixed material is 22.0c.
m, and the unit volume weight of the cured product manufactured using this mixed wire is 0.585 kgZ, and the thermal conductivity is 0.
, 224 kcal/mh"o.

This lightweight concrete mixed material has a high thermal conductivity, so it is disadvantageous to use it for structures or buildings.

[Comparative Example 5] 8 A cement composition was prepared in the same manner as in Example 7 except that diatomaceous earth was not used.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixed for 3 minutes to prepare a lightweight concrete mixture.

When this lightweight concrete mixed material was observed, no separation was observed, but it could be said that the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete 1/kneaded product is as low as 16.5 cm, and the unit volume weight of a cured product manufactured using this kneaded product is 0.472 kg.
/The thermal conductivity is 0,090 kcal/+sh”
It was O.

This lightweight concrete mixed material had a low slump value, making it unsuitable for pumping.

[Comparative Example 6] The same procedure as in Example 1 was carried out except that the amount of additive composition was changed to 200 g (amount of surfactant relative to cement weight: 1.118% by weight, amount of bituminous material: 0.215% by weight). A cement composition was prepared.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixing was performed for 3 minutes to prepare a lightweight concrete mixer.

The slump value of this lightweight concrete mixed material is 27.5c.
m, and the unit volume weight of the cured product produced using this kneaded product was 0.490 kg/h, and the thermal conductivity was 0.
, 112 kcal/mh”o.

This lightweight concrete mixed material had a high slump value, and separation of expanded polystyrene beads and water was observed, making it impractical.

[Comparative Example 7] In Example 1, the anti-caking agent diatomaceous acid was added to t5o.
A cement composition was prepared in the same manner except that the amount of anti-caking agent was 1% by weight based on the cement weight.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and mixing was performed for 3 minutes to prepare a lightweight concrete mixer.

When this lightweight concrete mixed material was observed, no separation was observed, but it could be said that the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete mixture is as low as 19.0 cm, the unit volume weight of the cured product manufactured using this mixture is 0.455 kg/kg, and the thermal conductivity is 0.090 kcal/peng. It was h”o.

This lightweight concrete mixed material had a low slump value, making it unsuitable for pumping.

[Comparative Example 8] Same as in Example 1 except that the amount of additive composition was changed to 30 g (surfactant 1: 0.168 weight of cement weight: 0.032 weight percent) A cement composition was prepared by operation.

The obtained cement composition was transferred to a mortar mixer, 6 kg of water was added, and kneaded for 3 minutes to prepare a lightweight concrete mixture.

When this light/warm concrete mixed material was observed, there was no separation, but it could be said that the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this light warm concrete mixture is as low as 20.0 cm, the unit volume weight of the cured product manufactured using this mixture is 0.564 kg/fl, and the thermal conductivity is 0.168.
kcal/mh” was 0.

This lightweight concrete mixed material has a low slump value, making it unsuitable for pumping, and the cured product produced using this mixed material also has high thermal conductivity, making it unsuitable for use in structures or buildings. Met.

[Comparative Example 9] 99.5 g of an additive composition (surfactant amount: 0.557% by weight, bituminous material content: 0.107% by weight, based on heavy cement water) was dissolved in 6 kg of water, and expanded polystyrene was added to the solution. After adding 30 beads and dry mixing for 1 minute, 15 kg of cement was added and mixing was performed for 3 minutes to obtain a lightweight concrete mixture.

When this lightweight concrete mixed material was observed, there was no separation, but it could be said that the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete mixture is 23.5 cm, and the unit volume weight of the cured product manufactured using this mixture is 0.
．． At 505 kg/M, the thermal conductivity is 0,098 kca
l/+sh”O.

This lightweight concrete mixture had a low slump value and was therefore unsuitable for pumping.

[Comparative Example 10] Crosstalk was carried out in the same manner as in Comparative Example 9 except that the amount of the additive composition was changed to 60 g (amount of surfactant relative to cement weight: 0.336% by weight, amount of bituminous material: 0.064% by weight). A lightweight concrete mixture was obtained.

When this lightweight concrete kneaded product was observed, no separation was observed, but the expanded polystyrene beads were not sufficiently dispersed. Therefore, the slump value of this lightweight concrete mixture is 19.0 cm, and the unit volume weight of the cured product manufactured using this mixture is 0.550 kg/
The thermal conductivity was O, 155 kcal/mh''o.

This lightweight concrete mixture has a low slump value, making it unsuitable for pumping, and the cured product produced using this mixture also has high thermal conductivity, making it unsuitable for use in structures or buildings. there were.

[Comparative Example 11] Crosstalk was carried out in the same manner as in Comparative Example 9 except that the amount of the additive composition was changed to 165 g (surfactant relative to the weight of cement!+0.923% by weight, amount of bituminous material: 0.177% by weight). A lightweight concrete (U) kneaded product was obtained.

The slump value of this lightweight concrete mixed material is 25.5c.
m, and the unit volume weight of the cured product produced using this mixed wire is 0.510 kg/l, and the thermal conductivity is O,
lO4kcal#+h℃te.

When this lightweight concrete 1 mixed wire material was observed, separation of expanded polystyrene beads and water was observed, and it was not practical.

[Comparative Example 12] Kneading was carried out in the same manner as in Comparative Example 9, except that the amount of expanded polystyrene beads was changed to 20 (twice the amount of the cement container), and a lightweight concrete kneaded product was folded.

The slump value of this lightweight concrete 1/kneaded product is 24.5
cm, and the unit volume weight of the cured product produced using this kneaded product was 0.585 kg/h, and the thermal conductivity was 0.
, 224 kcal/mh'o.

When this mixture of light and heavy concrete was observed, separation of expanded polystyrene beads and water was observed, and the thermal conductivity of a cured product produced using this mixture was also high, making it impractical.

[Comparative Example 13] A lightweight concrete kneaded product was obtained by kneading in the same manner as in Comparative Example 9, except that the amount of expanded polystyrene beads was changed to 40 grams (four times the amount of acid relative to the cement container).

When this lightweight concrete mixture was observed, there was no separation, but the amount of foamed polystyrene beads! 1. I couldn't hear it enough. Therefore, this light and heavy concrete)
The slump value of the 'Ilr kneaded product is 19.5 cm, the unit volume weight of the cured product produced using this kneaded product is 0.465 kg/cm, and the thermal conductivity is 0.095 kc.
al/mh”o.

This lightweight concrete mixture had a low slump value and was therefore unsuitable for pumping.

[Comparative Example 14] After putting 30 pieces of expanded polystyrene beads into a forced mixer with 0.3 kg of water and stirring, 2 kg of cement was added.
was added and further stirred to adhere cement to the surface of the expanded polystyrene beads.

The expanded polystyrene beads with cement attached to the surface were transferred to a mortar mixer, 13 kg of cement (total 15 kg) was added, and after dry kneading, 5.7 kg of water (
A total of 6 kg of At was added and kneaded to obtain a lightweight concrete mixture.

When this lightweight concrete kneaded product was observed, it was found that the expanded polystyrene beads were very poorly dispersed, and that the expanded polystyrene beads and water were so separated that it was impossible to use it in practice.

[Comparative Example 15] A lightweight concrete J7 mixture was obtained in the same manner as in Comparative Example 14, except that the amount of water used was 5.25 kg.

When this light and heavy concrete mixed material was observed, it was found that the expanded polystyrene beads were poorly dispersed, and separation of the expanded polystyrene beads and water was observed.

The slump value of this lightweight concrete mixed material is 10.0c.
m, and the median volumetric weight of the cured product produced using this kneaded product was 0.690 kgZ.

In addition, this lightweight concrete 1/kneaded material is Slumpy 1r.
Since i was low, it was unsuitable for pumping.

[Comparative Example 16] A lightweight concrete kneaded product was obtained in the same manner as in Comparative Example 14 except that the amount of wood used was 4.5 kg.

When this light and heavy concrete mixture was observed, it was found that the expanded polystyrene beads were poorly dispersed.
No separation of expanded polystyrene beads and water was observed.

The slump value of this lightweight concrete mixture is 4.0 cm
The unit volume weight of the cured product produced using this kneaded product was 0.680 kg/liter.

This lightweight concrete mixture had a low slump value and was therefore unsuitable for pumping.

Patent applicant Ube Industries Co., Ltd. Representative Patent Attorney Yasuo Yanagawa

Claims (1)

[Claims] 1. (I) cement; (II) expanded polystyrene beads at a volume ratio of 1.5 to 4.5 times the cement; (IIF);
A cement composition characterized in that it comprises 1.05% by weight of a surfactant, 0.04-0.45% by weight of bituminous material and 0.03-0.85% by weight of an anticaking agent. 2. The cement composition according to claim 1, wherein the anti-caking agent is diatomaceous. 3. The cement composition according to claim 1, wherein the surfactant is mainly composed of a formaldehyde condensate of sodium naphthalene sulfonate. 4. The cement composition according to claim 1, wherein the expanded polystyrene beads have a particle size of 18 mm or less. The cement composition according to claim 1, characterized in that the particle diameter of the 5° expanded polystyrene beads is in the range of 1 to 6 mm. 6. (I) cement, (II) expanded polystyrene beads in a volume ratio of 1.5 to 4.5 times the volume of cement, and 0.18 to 1,05 of each of (I) and cement]. A premix consisting of % by weight of surfactant, 0.04-0.45% by weight of bituminous material and 0.03-0.85% by weight of anti-caking agent. ]・Method for producing the composition. 7. The method for producing a cement composition according to claim 6, wherein the anti-caking agent is diatomaceous.