37results about How to "Avoid defects such as congenital microcracks" patented technology

The invention discloses a C190 strength-grade concrete for a formed steel concrete composite structure, which is composed of 466 parts of cement, 842 parts of fine aggregate, 1065 parts of coarse aggregate, 97 parts of water, 19 parts of concrete superplasticizer, 1.1 parts of defoaming agent, 75 parts of silicon powder, 119 parts of expanding agent, 7 parts of activator and 38 parts of expanding agent. The preparation method comprises the following steps: blending the concrete superplasticizer and activator into weighed water to obtain a mixture, sequentially adding the fine aggregate and 1 / 3 of the mixture into a stirrer according to parts by weight, and stirring; adding the coarse aggregate and 1 / 3 of the mixture, and stirring; adding the cement, expanding agent, silicon powder and fly ash, and stirring; and adding the defoaming agent and the rest of mixture, stirring and discharging. The concrete can obviously improve the bonding property between the formed steel and the concrete in a natural state, effectively displays the respective mechanical properties and the synergic working performance of the steel and concrete, greatly enhances the loading capacity, service performance and durability of the structural member, and has high volume stability and economical efficiency.

The invention discloses concrete with strength grade of C140 used for a profile steel-concrete composite structure. The concrete is characterized by being prepared from cement, fine aggregate, coarse aggregate, water, a water reducing agent, an antifoaming agent, siliceous dust, coal ash(kg / m<3>) in a mixing proportion of 485:660:1,173:117:13:0.7:65:100. A preparation method of the concrete comprises the following steps of: adding the fine aggregate and the water in an amount of which is a half based on the total weight of the used water into a forced mixer according to the weight proportion in turn; uniformly stirring for 1 to 2 minutes; adding the coarse aggregate into the mixer; uniformly stirring for 2 to 4 minutes; adding the cement, the siliceous dust and the coal ash into the mixer; uniformly stirring for 2 to 3 minutes; adding the water reducing agent, the antifoaming agent and the rest water into the mixer; uniformly stirring for 2 to 5 minutes; and discharging to obtain a concrete mixture. The concrete can obviously improve the adhesive property between profile steel and the concrete in a natural state, effectively exert respective capacity and cooperative work performance of both materials, greatly improve the carrying capacity and performance of members, and improve the durability, high volume stability and economy of the members.

The invention discloses C150 (strength grade) concrete for a section steel-concrete combined structure, which is characterized by being prepared by mixing cement, fine aggregate, coarse aggregate, water, water reducer, defoaming agent, siliceous dust and flash ash in a mass / volume ratio of 485:701:1,145:104:15:1:65:100. The preparation method of the concrete comprises: adding the fine aggregate and half of the total amount of water into a forceful stirrer in turn according to a weight mixing ratio, uniformly stirring for 1 to 2 minutes, adding the coarse aggregate, uniformly stirring for 2 to4 minutes, adding the cement, the siliceous dust and the flash ash, uniformly stirring for 2 to 3 minutes, adding the water reducer, the defoaming agent and the rest of water, uniformly stirring for 2 to 5 minutes, and discharging to obtain a concrete mixture. The concrete has obviously improved section steel binding performance in a natural state and can effectively play respective capability and coordinate operation performance with the section steel, thereby improving the bearing capacity and performance of a member considerably and improving the durability, high-volume stability and economy of the member.

The invention discloses C45 strength level concrete for a steel section-concrete combined structure, which is prepared from cement, fine aggregate, coarse aggregate, water, an efficient water reducer, a defoaming agent, silica fume, fly ash, and a composite booster in a ratio of 310:698:1197:142:6:1:30:70:2.5 (kg / m<3>). A preparation method comprises the steps of: uniformly mixing polycarboxylic acidefficient water reducer and the composite booster with weighed water to obtain a mixture, adding 1 / 3 of the total amount of the fine aggregate and the coarse aggregate according to the weight ratio to a stirrer, stirring, adding 1 / 3 of the total amount of the coarse aggregate and the mixture, stirring, adding the cement,silica fume, and fly ash, stirring, adding the defoaming agent and the rest mixture, stirring, and discharging. According to the concrete, the adhesion property between the steel section and concrete is significantly improved in natural state, and the respective mechanical property and synergic working property of the steel and concrete materials are effectively exerted, so that the bearing capability and use performance of a structural element are greatly improved and the structure durability is improved.

The invention discloses a C200 strength-grade concrete for a formed steel concrete composite structure, which is composed of 473 parts of cement, 846 parts of fine aggregate, 1054 parts of coarse aggregate, 98.8 parts of water, 19.6 parts of concrete superplasticizer, 1.1 parts of defoaming agent, 84 parts of silicon powder, 123 parts of expanding agent, 7.2 parts of activator and 40 parts of expanding agent. The preparation method comprises the following steps: blending the concrete superplasticizer and activator into weighed water to obtain a mixture, sequentially adding the fine aggregate and 1 / 3 of the mixture into a stirrer according to parts by weight, and stirring; adding the coarse aggregate and 1 / 3 of the mixture, and stirring; adding the cement, expanding agent, silicon powder and fly ash, and stirring; and adding the defoaming agent and the rest of mixture, stirring and discharging. The concrete can obviously improve the bonding property between the formed steel and the concrete in a natural state, effectively displays the respective mechanical properties and the synergic working performance of the steel and concrete, greatly enhances the loading capacity, service performance and durability of the structural member, and has high volume stability and economical efficiency.

The invention discloses concrete with the strength grade of C35 for steel reinforced concrete composite structures. The concrete comprises cement, fine aggregate, coarse aggregate, water, a high-efficiency water reducing agent, a defoaming agent, silicon ash, coal ash and a composite excitant (kg / m<3>) in a proportioning ratio of 290:735:1103:150:4:1:20:70:2. A preparation method of the concrete comprises the following steps: firstly, uniformly mixing a polycarboxylic acid high-efficiency water reducing agent and the composite excitant into weighed water so as to obtain a mixture, sequentially adding fine aggregate and 1 / 3 of the mixture into a stirring machine according to the weight proportioning ratio, adding coarse aggregate and 1 / 3 of the mixture, stirring, adding cement, silicon ash and coal ash, stirring, adding the defoaming agent and the rest mixture, stirring, and discharging. According to the concrete, the bonding property of steel and concrete can be greatly improved in a natural state, and respective mechanical properties and mutual cooperative working performance of the two materials, namely, steel and concrete, can be effectively brought into play, so that the bearing property and the use performance of a structural part can be greatly improved, and the structural durability can be improved.

The invention discloses concrete at a strength grade of C40 for a steel reinforced concrete composite structure. Cement:fine aggregate:coarse aggregate:water:super plasticizer:antifoaming agent:silica fume:fly ash:composite activator (kg / m<3>) is 300:740:1,089:155:4:1:30:70:2. A preparation method comprises the following steps of uniformly mixing the polycarboxylate type super plasticizer and the composite activator into weighed water to obtain a mixture, sequentially mixing the fine aggregate and 1 / 3 of the total amount of the mixture into a stirrer according to a weight ratio, adding the course aggregate and 1 / 3 of the total amount of the mixture, performing stirring, adding the cement, the silica fume and the fly ash, performing stirring, adding the antifoaming agent and the residual mixture, and performing stirring and discharging. According to the concrete, bonding performance between structural steel and the concrete can be remarkably improved in a natural state, and respective mechanical performance and cooperative working performance of the steel and the concrete can be effectively utilized, thereby greatly improving bearing capacity and application performance of a structural component and improving durability of the structure.

The invention discloses a concrete of strength grade C55 for a profile steel reinforced concrete structure. The concrete contains the ingredients: cement, fine aggregates, coarse aggregates, water, an efficient water reducing agent, an antifoamer, silica fume, fly ash and a composite excitant, wherein the ratio (kg / m<3>) of the cement to the fine aggregates to the coarse aggregates to the water to the efficient water reducing agent to the antifoamer to the silica fume to the fly ash to the composite excitant is 330: 713: 1186: 160: 6: 1: 30: 80: 2.5. A preparation method of the concrete comprises the steps of firstly, uniformly mixing the polycarboxylic acid efficient water reducing agent and the composite excitant with the weighed water so as to obtain a mixture, sequentially adding the fine aggregates and 1 / 3 the total weight of the mixture into a stirrer according to a weight ratio, carrying out stirring, adding the coarse aggregates and 1 / 3 the total weight of the mixture into the stirrer, carrying out stirring, adding the cement, the silica fume and the fly ash into the stirrer, carrying out stirring, adding the antifoamer and the remaining mixture into the stirrer, carrying out stirring, and carrying out discharging. The concrete can be used for remarkably improving the bonding property between profile steel and the concrete in a state of nature, and respective mechanical properties and mutual cooperated working performance of two kinds of materials, i.e., the steel and the concrete are effectively exerted, so that the bearing capacity and use performance of structural elements are substantially improved, and the durability of structures is improved.

The invention discloses concrete for the steel reinforced concrete composite structure C250 strength grade. The matching ratio of cement to fine aggregate to coarse aggregate to water to water reducing agent to antifoaming agent to silica powder to coal ash to exciting agent to expanding agent to composite plastic retaining agent is 504:769:1,308:102:21:1.5:100:125:11:52:0.65. A preparing method includes the steps that the water reducing agent, the exciting agent and the composite plastic retaining agent are evenly stirred into water to obtain a mixture, and the fine aggregate and 1 / 3 of the total mixture are sequentially added into a stirring machine according to the weight ratio and stirred to be even; the coarse aggregate and 1 / 3 of the total mixture are added and stirred to be even; the cement, the expanding agent, the silica powder and the coal ash are added and stirred to be even; the antifoaming agent and the residual mixture are added, and the mixture is stirred and discharged. By means of the concrete, the bonding performance between structural steel and the concrete can be remarkably improved under the natural state, the mechanical performance and the cooperative work performance of the steel and the concrete are effectively developed, the carrying capacity, the use performance and the durability of a structural element are greatly improved, and the concrete has the good high volume stability and the good economy.

The invention discloses a concrete for a profiled steel concrete composite structure with C110 in strength grade and is characterized in that the concrete mix ratio to fine aggregate to coarse aggregate to water to water reducer to siliceous dust to coal ash (kg / m<3>) is 450:496:1276:138:9:60:90. A preparation method of the concrete comprises the following steps: adding the fine aggregate and thewater to a forced mixer in proportion by weight, wherein the water accounts for 50% of the total water consumption; evenly stirring the mixture for 1-2min, adding the coarse aggregate for evenly stirring for 2-4min, adding the concrete, the siliceous dust and the coal ash for stirring for 2-3min, and adding the water reducer and the rest of the water; and finally evenly stirring the mixture for 2-3min and discharging to obtain the concrete mixture. The concrete can obviously improve the adhesive property between the profiled steel and the concrete under the natural condition and effectively exert individual capacity and cooperative work performance of the two materials, thereby greatly improving bearing capacity and performance of construction members and enhancing durability, high-volumestability and economy thereof.