CN1412143A - Concrete PT additive material and its preparation method - Google Patents

Abstract

The composition of concrete PT admixture is formed from 70-30% of tufa and 30-70% of phosphorus ore slag, its physical properties: fineness: 45 micrometer seiving residue is less than or equal to 40%, water content is less than or equal to 5%, water demand ratio is less than 104%, 28 days strength ratio is greater than or equal to 64%, and P2O5 content is less than or equal to 3.5%. Its preparation method includes the following steps: pulverizing block tufa to obtain primary aggregate, drying phosphorus ore slag, mixing them, grinding them in ball grinding mill to standard, checking and putting in storage.

Description

Concrete PT additive material and preparation method

The present invention relates to be used for the material of roller compacted concrete and normal concrete construction, particularly a kind of concrete PT admixture and preparation method.

At present, produces a large amount of hydration heat for solving large volume roller compacted concrete and normal concrete construction cement in condensing process, thereby cause the technical problem of concrete cracking, successful experience is that the flyash of employing coal-burning power plant mixes among the concrete as adulterant.But in 1,000,000 grades of large engineering constructions; its geographical position generally all is among the deep mountain valleys away from city and manufacturing district; and along with the enhancing of people to environmental consciousness; the coal-burning power plant that is unfavorable for save energy and environment protection is fewer and feweri, so the demand of flyash just is difficult to guarantee more; and haul distance is far away; transport condition is poor, has increased the production cost of adulterant, and it will increase bigger investment to a large-scale power station construction based on amount of concrete.

The objective of the invention is to propose a kind of concrete PT additive material and preparation method's new technical scheme, this technical scheme not only can effectively solve cement and produce a large amount of hydration heat in condensing process, the technical problem that causes concrete cracking, can also gather materials on the spot, save cement consumption, accelerating construction progress reduces construction costs.

The present invention implements like this, and concrete PT additive material, the weight percent of its component and content be,

Tuff: 70-30%,

Phosphorus ore quarrel: 30-70%

Its physical property is fineness: 45um tails over≤and 40%, water ratio≤5%, water demand ratio＜104%, 28 day strength ratio 〉=64%, P ₂O ₅≤ 3.5%.

The preparation method of concrete PT additive material of the present invention, produce according to the following steps:

(1), with the block tuff fragmentation of blasting excavation, forming particle diameter is the first aggregate of 20-80mm,

(2), with phosphorus ore quarrel oven dry,

(3), the phosphorus ore quarrel of tuff aggregate, oven dry is just mixed the input ball mill by claim 1 weight ratio percentage and be milled to the described standard of claim 1, check, warehouse-in.

Tuff (Tuff, be abbreviated as among the present invention: T) very wide for distributing in China, it has been generally acknowledged that few of industrial value.Tuff (T) is made up of the mixture of some silicate, and its main component is SiO ₂And Al ₂O ₃, both are about 78-83% by content, and it has, and cohesiveness is good, and time of coagulation is long, early strength height, the characteristic that limit stretch value and Young's modulus are bigger.(Phosphorous mineral slag is abbreviated as among the present invention: P) be the byproduct after Rock Phosphate (72Min BPL) is carried phosphorus, be made up of the slick vitreum of exhibiting high surface that main chemical compositions is SiO the phosphorus ore quarrel ₂And CaO, its content easily generates the C-S-H gel up to 85.35%, and P ₂O ₅Content meets the requirement that GB GB6645-86 is used for the granulation electric furnace phosphoric slag Chemical Composition of cement less than 3.5%.Two kinds of raw-material mix proportionses are looked chemical composition content decision separately.

Concrete PT additive material of the present invention can be widely used in roller compacted concrete and normal concrete construction, particularly large volume grinding concrete construction.Utilization of the present invention can reduce construction costs from many aspects, at first is to have reduced low cement content in a large number.The secondth, reduced a large amount of hydration heat that produce in the cement setting process, reduce the factor of concrete cracking, thereby simplified concrete other temperature control measures, accelerating construction progress.The 3rd is that tuff (T) can be gathered materials on the spot, and the effect that social enviroment protection is administered has been played in the utilization again of renewable resource industrial waste ballast phosphorus ore quarrel.The present invention is a kind of novel a kind of concrete PT additive material in the outer adulterant of multiple class.

Make a pilgrimage to a temple on a famous mountain the greatly utilization of PT adulterant in the concrete construction of ten thousand stere more than 1 00 of power station of Yunnan, solved the correlation technique problem of casting of concrete in mass, guaranteed construction quality, reduced construction costs, accelerated construction speed, shorten the construction period, also solved the problem of environmental protection aspect simultaneously.

Embodiment:

Embodiment

The PT concrete admixture reaches step by the following method and produces:

(1), adopt the rubble crusher to carry out fragmentation the block tuff (T) of blasting excavation, forming particle diameter is the first aggregate of 20-80mm, preserves by rotary conveyor input raw material storage again;

(2), the phosphorus ore of raw material storage quarrel (P) sent in the dryer by rotary conveyor dries, preserve by rotary conveyor input semifinished product warehouse;

(3) the first aggregate of the tuff (T) that will divide the storehouse to preserve, the phosphorus ore quarrel (P) that semifinished product warehouse is preserved take by weighing back mixing input ball mill by weight percentage and mill by meter electronics;

(4), by the compound of standard test through milling, inspecting standard is (table-4), fineness: 45um tails over≤40%; Water ratio≤5%; Water demand ratio＜104%; 28 days strength ratio 〉=64%.The compound of standard up to standard is sent the finished product material into the finished product transport pipe by blower fan and blast conditioning equipment;

(5) in the finished product transport pipe, extract sample and carry out the scene detection: the qualified stockyard that then enters; The defective extraction qualified product of milling once more, circulate that promptly return in the ball mill.Below be the chemical composition content table after the PT material fusion of three kinds of Different Weight per-cents:

Table-1PT adulterant chemical composition content table is as P: T=70: during 30 (%):

Chemical ingredients	SiO 2	?CaO	?MgO	?SO 3	?TiO 2	?P 2O 5	??MnO 2	??K 2O	??Na 2O	??Fe 2O 3	??Al 2O 3	Loss on ignition
													Content (%)	49.82	?30.77	?1.79	?0.97	?0.34	?0.96	??0.10	??0.75	??0.74	??0.45	??7.84	????1.55

Table-2PT adulterant chemical composition content table is as P: T=50: during 50 (%)

Chemical ingredients	??SiO 2	??CaO	??MgO	??SO 3	??TiO 2	??P 2O 5	??MnO 2	??K 2O	??Na 2O	?Fe 2O 3	??Al 2O 3	Loss on ignition
													Content (%)	??54.07	??22.38	??2.02	??0.77	??0.46	??0.84	??0.10	??0.90	??0.89	?0.39	??10.03	????2.20

Table-3PT adulterant chemical composition content table is as P: T=30: during 70 (%)

Chemical ingredients	SiO 2	CaO	??MgO	??SO 3	??TiO 2	??P 2O 5	??MnO 2	??K 2O	??Na 2O	??Fe 2O 3	??Al 2O 3	Loss on ignition
													Content (%)	58.32	13.99	??2.19	??0.58	??0.58	??0.67	??0.10	??1.05	??1.04	??0.33	??12.21	????2.84

PT adulterant finished product physical properties inspection technology table standard: see the following form-4

Table-4PT adulterant finished product physical properties inspection technology standard

Title	Density (kg/m3)	Fineness (45u tails over)	Need water than (%)	28 days strength ratios (%)	Water ratio (%)
						The PT adulterant	????＞2800	???≤40％	??＞104	≥64	≤5

The utilization example of PT adulterant in grinding concrete construction: see the following form-5

The utilization embodiment of table-5PT adulterant in roller compacted concrete

Sequence number	Numbering	Proportioning	Cement (kg/m 3)	PT expects (kg/m 3)	Water (kg/m 3)	Sand coarse aggregate ratio (%)	FDN-04 admixture dosage (%)	Vc value (S)	90d pressure control intensity (MPa)
										Example 1	?R15-3	No. 150 three gratings	?68	????96	???85	????34	????0.70	????9	?23.20
Example 2	?R20-2	No. 200 two gratings	?110	????100	???95	????40	????0.85	????10	?33.50
										Example 3	?R20-3	No. 200 three gratings	?74	????104	???85	????34	????0.70	????10	?25.60

Annotate: the Vc value---refer in the laboratory, make concrete test block, the required vibrating time of concrete test block when its degree of compactness reaches optimum regime, unit: second.The utilization example of PT adulterant in the normal concrete construction: see the following form-6

Table-6PT adulterant is at the utilization embodiment of normal concrete

Sequence number	Numbering	Proportioning	Cement (kg/m 3)	PT expects (kg/m 3)	Water (kg/m 3)	Sand coarse aggregate ratio (%)	FDN-07 admixture dosage (%)	????C vValue (cm)	90d resistance to compression (MPa)
										Example 1	?R15-3	No. 150 three gratings	????125	????54	???125	????35	????1.25	????7	????15.60
Example 2	?R20-2	No. 200 two gratings	????144	????96	???144	????40	????1.44	????7	????20.50
										Example 3	?R20-3	No. 200 three gratings	????120	????80	???120	????34	????1.20	????7	????21.35

Annotate: C _vValue is the slump value.Normal concrete cement consumption synopsis does not see the following form-7 after not adding the PT adulterant and adding the PT adulterant

Table-7

The design label	?R15-2 ?kg/m 3	?R15-3 ?kg/m 3	?R15-4 ?kg/m 3	??R20-2 ??kg/m 3	?R20-3 ?kg/m 3	?R20-4 ?kg/m 3	?R25-2 ?kg/m 3	?R25-3 ?kg/m 3	?R30-2 ?kg/m 3	?R30-3 ?kg/m 3
											Cement consumption	?185	?175	?165	??228	?195	?186	?290	?275	?320	?305
Cement C/PT	?148/63	?125/54	?110/51	??144/80	?120/80	?110/73	?208/52	?173/43	?249/62	?208/52

Can in above-mentioned cited embodiment

To find out: the cement consumption of normal concrete can reduce about 30% after mixing the PT adulterant; The cement consumption of roller compacted concrete can reduce about 30% after mixing the PT adulterant again.Generally speaking, the utilization of PT adulterant can reduce the cement consumption about 60%.

Claims (2)

1, a kind of concrete PT additive material, the weight percent of its component and content be,

Tuff: 70-30%,

Phosphorus ore quarrel: 30-70%

Its physical property is fineness: 45um tails over≤and 40%, water ratio≤5%, water demand ratio＜104%, 28 day strength ratio 〉=64%, P ₂O ₅≤ 3.5%.

2, the preparation method of concrete PT additive material as claimed in claim 1, produce according to the following steps:

(1), with the block tuff fragmentation of blasting excavation, forming particle diameter is the first aggregate of 20-80mm,

(2), with phosphorus ore quarrel oven dry,

(3), the phosphorus ore quarrel of tuff aggregate, oven dry is just mixed the input ball mill by claim 1 weight percent, be milled to the described standard of claim 1, check, warehouse-in.