CN1978837A

CN1978837A - Gas-added self heat-insulation composite weight-bearing build brick of concrete

Info

Publication number: CN1978837A
Application number: CNA2005101109159A
Authority: CN
Inventors: 李翔; 顾祥林; 张伟平
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2005-11-29
Filing date: 2005-11-29
Publication date: 2007-06-13

Abstract

The invention discloses concrete air entraining self heat preservation compound bearing building block compounded by concrete and air entraining concrete. It includes concrete core block and external insulating layer. The former is set in the building block as bearing material. The air entraining concrete is set at the periphery of the core block as the external insulating layer. The two inorganic materials are made into the building block with of the functions of self heat preservation and bearing which can replace the common clay brick and has the advantages of saving limit land resource, greatly improving wall body useful life, simple processing, convenient construction, compressive strength that over 10MPa.

Description

Gas-added self heat-insulation composite weight-bearing build brick of concrete

Technical field

The present invention relates to the building block of building wall body and function, be specifically related to a kind of gas-added self heat-insulation composite weight-bearing build brick of concrete.

Background technology

Continuous development along with Building Trade in China, people require more and more higher to the feature of environmental protection of constructional materials, to on June 30th, 2003, existing 160 cities of China ban use of solid clay brick in limited time, originally a large amount of conventional clay of using can not satisfy " energy-conservation, joint soil " requirement in body of wall, and novel materials for walls such as concrete perforated brick, gypsum block and air-entrained concrete building block constantly occur.Because have high-strength, lightweight, save land, energy-conservation, sharp advantage such as useless, concrete small size hollow building block becomes the leading materials for wall that replaces solid clay brick at present just gradually.But along with a large amount of uses of concrete small block, problems such as the cracking seepage of blockwork also become increasingly conspicuous, and general 190mm single row of holes concrete small block wall heat transfer coefficient is about 2.78W/ (m ².K), heat-insulating property is poor, along with the issuing and implementation of building energy-saving standard, must adopt supporting insulation measure, and the small-sized hollow building block body of wall is applied in various places.Therefore the exploration design is a kind of has the building block of load-bearing and energy-conservation dual-use function and improves the wall crazing problem, not only has certain theoretical significance, and has the important engineering practical value.

In order to reach the target of heat-preserving load-bearing simultaneously, insulation composite lead-bearing building block at present having begun to use in the engineering, this bearing building block is by in the inner hole of concrete hollow block or fill heat insulating materials such as expanded perlite, polystyrene between the slit to improve wall insulation performance.Because insulation layer is in building block inside, interior insulation blocks is easy to generate cold bridge and the dewfall phenomenon occurs, so result of use is relatively poor.Because organic materials such as employing polystyrene are as insulation layer, so the durability of building block also can't be guaranteed.

Except insulation blocks in attempt adopting, also be everlasting on load-bearing metope paste polystyrene plate or sprayed polyurethane layer of engineering is incubated processing at present.Owing to need carry out the field operation of multiple tracks complexity, so the wall construction difficult quality is guaranteed, and adopts the wall cost of this way higher.Because heat insulating material adopts the organic material and the wall outer side of being everlasting, be difficult to guarantee therefore that organic insulation material can reach bearing wall same service life.

Up to the present, still do not have the performance good quality production and can substitute loam brick commonly used fully.

Summary of the invention

In order to realize the target of human social, overcome the shortcoming of the interior insulation of above-mentioned building block and exterior-wall heat insulation product and method, the invention discloses a kind of gas-added self heat-insulation composite weight-bearing build brick of concrete, building block of the present invention is to be composited by concrete pellet and gas concrete layer; The concrete pellet is arranged on building block inside,, the gas concrete layer is arranged on the concrete pellet periphery of load-bearing, as the external thermal insulation of concrete pellet as load-bearing material; The concrete pellet can also can have hollow hole for solid.Two kinds of inorganic material are made not only self-heat conserving but also load-bearing, have the building block of dual-use function, can substitute present common clay brick fully.Not only can save China's limited land resources, also can realize the target that body of wall is energy-conservation, simultaneously, improve the application life of body of wall greatly.

Present concrete small size hollow building block wall body slit, mainly cause by concrete material drying shrinkage and action of thermal difference, building block of the present invention has the self-heat conserving function, can reduce the crack that body of wall produces because of thermal (temperature difference) stress on the one hand, heat-insulating property is good on the other hand, can save the energy greatly, meets the new demand of building energy conservation, make its compliance more extensive, be convenient to promote; The present invention selects gas concrete as heat insulating material, compares with organic material, can increase the service life; The cold bridge phenomenon that adopts outer heat preserving mode can avoid interior insulation to produce; Selecting the pellet of building block is concrete material, not only can save the energy, and has taken into account the influence of bulk weight to construction.The compressive strength of the composite block of making of the present invention can reach more than the 10MPa; Body of wall tensile strength improves, and cracking resistance improves; Site operation is easy, and quality can access effective assurance; Production technology is simple, the cost performance height, and the body of wall comprehensive cost is lower.

Description of drawings

The present invention will be further described below in conjunction with drawings and Examples.

Fig. 1: the concrete pellet is solid composite block structural representation;

Fig. 2: the concrete pellet is hollow porosity Composite block structure schematic diagram;

Fig. 3: the concrete pellet is hollow porous composite block structural representation;

1. gas concrete layer, 2. concrete pellet, 3. pellet hollow core hole.

The specific embodiment

Composite block length, width and get 240mm, 90mm and 90mm highly respectively.The concrete pellet is solid.

Embodiment 1: have enough resistance to compression bearing capacities in order to verify composite block, grade of compressive strength A3.5, bulk density B06 quartz sand aerated-block are selected in test for use, according to the gabarite of Fig. 1 solid composite building block commodity air-entrained concrete building block excision forming that dimensions is relatively large, utilize the low speed electric drill on aerated-block, to hole, saw by hand by the solid pellet size of concrete then and dig out hole.The rubble that adopts maximum particle diameter 10mm is as coarse aggregate, (nominal mix proportion is a stone: sand: cement: water=1: 1: 1: 0.75) pour into hole with pea gravel concreten, through 40 days natural curing, polish the test block surface at last and obtain self heat-insulation composite weight-bearing building block finished product.The compressive strength that has confirmed this building block by compression test can reach 14MPa, and this preparation method can be the comprehensive mechanics of composite block, the thermal property test provides experiment building block product.

Embodiment 2: in order to produce gas-added self heat-insulation composite weight-bearing build brick of concrete on a large scale in factory, can utilize the ordinary concrete block machine to produce the concrete pellet of composite block inside, just can pack into after through natural curing in 3 days particular manufacturing craft and positioning of pellet according to selected concrete mix and pellet size.While is according to the proportional arrangement gas concrete siccative of 425# portland cement 9%, quicklime 29%, sand 59%, dihydrate gypsum 2%, aluminium powder 8 ‰, triethanolamine 2 ‰, then according to water and 1: 0.65 proportional arrangement gas concrete slip of siccative, stir slip and the slip of pasty state is poured in the space in the concrete pellet outside in the mould.Quietly stop treating about 5 hours can adopt after the gas concrete slip solidifies steel wire cutting machine finishing block surfaces, will be with the mould building block to send into still kettle then.Utilize 183 ℃ of temperature, pressure 10kg/cm ²Saturated vapor maintenance building block, successively handle through the pressurization that vacuumizes in half an hour, heated up in 3 hours, 8 hours constant temperature and pressures and 2 hours decrease temperature and pressure, just can obtain the composite block finished product after going out the still building block demoulding.Through sampling inspection and later stage maintenance, gas-added self heat-insulation composite weight-bearing build brick of concrete can the overlay film packing dispatch from the factory, and is transported to the building site at last and is built into the body of wall with insulation and weight-bearing function.

For avoiding one-tenth wall of present concrete small size hollow building block body of wall, the disadvantage that straight joint very easily occurs, composite block will adopt the inside and outside fissure of displacement of traditional brick wall, the masonry way of layering overlap joint, so both improve the shear strength of body of wall, can improve body of wall anti-crack and anti-seepage ability again.

Claims

1. gas-added self heat-insulation composite weight-bearing build brick of concrete is to be composited by concrete pellet and gas concrete layer; It is characterized in that: the concrete pellet is arranged on building block inside, and as load-bearing material, the gas concrete layer is arranged on the concrete pellet periphery of load-bearing, as the external thermal insulation of concrete pellet.

2. gas-added self heat-insulation composite weight-bearing build brick of concrete according to claim 1 is characterized in that: the concrete pellet can also can have hollow hole for solid.