Cast-in-situ concreting method of sea platform

FIELD: construction.

SUBSTANCE: invention relates to erection of cast-in-situ structures in difficult-to-access areas, and namely to cast concrete mixtures for cast-in-situ concreting of building structures. A cast-in-situ concreting method of a stationary sea ice-resistant platform involves preparation of concrete mix by mixing of dry components: a binding agent - Portland-slag cement, quartz sand, granite crushed stone with fraction of 5-20 mm, fine crushed mineral filler - MP-1 powder, with water and additives - a plasticising agent based on polycarboxylates - Muraplast FK-63 and hardening retarder - Centrament Retard 390, till concrete mix of cast consistency with cone spread of 50-70 cm is obtained, and with delamination of not more than 0.4% and with preservation capacity of at least 3 hours, supply of concrete mix to a framework with a concrete pump at flow rate of 2500-3000 l/h, and hardening is performed under normal conditions during 28-60 days, at the following component ratio, wt %: Portland-slag cement 13.3-16.9, quartz sand 42.4-42.6, the above said crushed stone 25.3-27.9, mineral powder MP-1 6.6-6.8, the above said plasticising agent 0.1-0.2, the above hardening retarder 0.07-0.08, and water is the rest.

EFFECT: providing viscosity and preservation capacity of concrete mix at its supply, and improving concrete crack resistance.

4 tbl

 

The invention relates to the construction of monolithic structures in remote areas, namely to cast concrete mixtures cast concrete building structures.

The known method monolithic concrete by filling the formwork cast concrete mixture containing Portland cement, mineral aggregate, silica fume, superplasticizer and water, as well as gidrofobiziruyuschey silicone fluid /1/.

The disadvantage of concrete mix is the high consumption of binder, the resulting thermal strains in the process of hardening when pouring large amounts, and also increases the cost of the concrete.

The known method monolithic concrete by filing a cast concrete mixture of the following composition: Portland cement, crushed stone, sand, bentonite, fly ash, plasticizer on polycarboxylate base, water. The resulting concrete has a high mobility and does not require additional seals /2/.

The disadvantages of the known methods of concreting of poured concrete are high cement consumption, low crack resistance when concreting large-scale structures of large volumes with limited access to areas of the concrete due to the occurrence of thermal strain hardening of the array. In addition to the CSO, the known composition of the concrete mix may not achieve the parameters of the viscosity of the mixture and the persistence needed to supply the mixture of the concrete in inaccessible areas of the structure.

The technical problem is to increase the fracture toughness of monolithic concrete during concreting large construction and maintenance of viscosity and the persistence of the mixture for feeding the mixture into hard to reach areas of the structure.

This object is achieved in that in the method of the monolithic concrete offshore platform, comprising preparing a concrete mixture by mixing the dry components - binder, quartz sand, crushed granite fraction 5-20 mm, it is mineral filler, water and additives plasticizer on the basis of polycarboxylate to obtain a molded concrete mix, concrete mix feeding into the formwork and exposure to curing, according to the invention, the concrete mixture is prepared by mixing the components to obtain a concrete mixture molded consistence with repliva cone 50-70 cm, the separation of not more than 0.4% and the persistence of not less than 3 hours, the flow of the concrete mix into the formwork to produce a concrete pump with a flow rate 2500-3000 l/h, and the hardening is carried out in normal conditions during 28-60 days, with binder of slag Portland cement, in which the quality of fine-grinded mineral filler - powder MP-1 inactivated sedimentary rocks, and as additives, plasticizer on the basis of polycarboxylate - Muraplast FK-63 and optionally a curing retarder - Centrament Retard 390, in the following ratio, wt. %:

the slag Portland cementa 13.3-16,9
sand quartz42,4 against 42.6
rubble25,3-27,9
mineral powder MP-16,6-6,8
the specified plasticizer0,1-0,2
the specified curing retarder0,07-0,08
waterrest

The proposed method differs from the known fact that the concrete mix is prepared by mixing the slag Portland cement, sand, gravel, and fine-grinded mineral powder MP-1 with mixing water and additives plasticizer and curing retarder to obtain a concrete mixture molded consistence with repliva cone 50-70 cm, the separation of not more than 0.4% and the persistence of not less than 3 hours, the flow of the concrete mix into the formwork to produce a concrete pump is about speed expiration 2500-3000 l/h, and hardening is carried out in normal conditions during 28-60 days.

The proposed concrete mix is characterized by the fact that, as the binder contains slag Portland cement, as it is mineral filler mineral powder MP-1 inactivated from sedimentary rocks, the plasticizer on the basis of polycarboxylates Muraplast FK-63, a curing retarder Centrament Retard 390, and ratio of components.

Introduction to concrete mixture as binder slag Portland cement contributes to reducing heat dissipation in monolithic concrete work and ensuring the strength of the concrete.

Mineral powder MP-1 provides the stability properties of the concrete mixture prevents sedimentation and separation of the concrete mix with water-cement ratio of 0.6.

The curing retarder provides uniformity of hardening of concrete over the whole cross section of the monolith and the mode of hardening within 60 days.

The plasticizer provides the necessary mobility of the concrete mixture.

Set the feed speed of the concrete mixture into the form gives you the opportunity to obtain uniform distribution of the mixture over the cross section of the product and to prevent stratification of the mixture.

The proposed ratio of the components: gravel - sand - mineral powder, in combination with the specified plasticizer gives you the opportunity to gain self-compacting concrete mixture is molded consistence with low heat dissipation specified parameters viscosity and persistence mobility for concreting large-scale structures.

The essence of the invention.

For concreting palletirovanie layer offshore platform was prepared by self-compacting concrete mixture by mixing the dry components of slag Portland cement, quartz sand, crushed granite fraction 5-20 mm, mineral powder, MP-1, followed by stirring the mixture of water and additives - curing retarder Centrament Retard and plasticizer on the basis of polycarboxylates Muraplast FK-63. Prepare the concrete class B20 in accordance with GOST 7473-94. Loading components of the concrete mix to produce concrete mixer in the following sequence: gravel - sand - mineral powder MP-1 - cement - water solution additives. The duration of mixing at least 1.5-2 minutes of the Obtained cast concrete mixture, characterized by the following properties: RASPLAV cone 50-70 cm, separation of not more than 0.4%, persistence more than 3 hours.

The concrete mix was applied to the formwork with the speed of the expiration of 2500-3000 l/h. Hardening was carried out in natural conditions within 60 days.

Characteristics of the used materials are given in table No. 1.

Examples of composition of concrete mixture and the data of physical-mechanical tests are summarized in tables 2, 3, and 4.

The proposed concrete mixture has the properties of a molded self-sealing compound with high persistence after cooking, which then allows for continuous pumping of concrete mix into the form with a high-speed monolithic concreting large-scale structures, for example bolasterone layer fixed offshore ice-resistant platform. While the proposed concrete mixture ensures optimum hardening of the array of concrete bolasterone layer offshore platform without the formation of cracks and, thus, makes it possible to provide uniform hardening within 60 days upon receipt of the specified density and strength of concrete.

The proposed method allows to obtain a reduction in the density of the concrete, and therefore weight, increase fracture toughness by providing a mode of hardening monolithic concrete, improve workability due to the persistence of the mixture over 4 hours while reducing stratification and supply of concrete mix pump to place concrete object.

Sources of information

1. RF patent №2057098, CL C04B 28/04, publ. 27.03.1996,

2. RF patent №2307810, CL C04B 28/04, publ. 10.10.2007, (prototype).

The way monolithic concrete fixed offshore ice-resistant platform, comprising preparing a concrete mixture by mixing the dry components - binder, quartz sand, crushed granite fraction 5-20 mm, it is mineral filler, water and additives - platifina is a PR on the basis of polycarboxylates and curing retarder to obtain a molded concrete mix, the supply of concrete mixture in the casing and the shutter speed before hardening, characterized in that the concrete mixture is prepared by mixing the components to obtain a concrete mixture molded consistence with repliva cone 50-70 cm, the separation of not more than 0.4% and the persistence of not less than 3 hours, the flow of the concrete mix into the formwork to produce a concrete pump with a flow rate 2500-3000 l/h, and the hardening is carried out in normal conditions during 28-60 days, and the binder slag Portland cement, as it is mineral filler powder MP-1 as a curing retarder - Centrament Retard 390, and as a plasticizer on the basis of polycarboxylate - Muraplast FK-63, in the following ratio, wt.%:

the slag Portland cementa 13.3-16,9
sand quartz42,4 against 42.6
rubble25,3-27,9
mineral powder MP-16,6-6,8
the specified plasticizer0,1-0,2
the specified curing retarder0,07-0,08
water rest



 

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