CN105314953A

CN105314953A - Ultralow-heat composite cementing material

Info

Publication number: CN105314953A
Application number: CN201510255216.7A
Authority: CN
Inventors: 夏枫; 邹兴芳; 陆小黑; 郭成洲; 张德华; 刘生超; 段琼
Original assignee: Gezhouba Group Cement Co Ltd
Current assignee: Gezhouba Group Cement Co Ltd
Priority date: 2015-05-19
Filing date: 2015-05-19
Publication date: 2016-02-10

Abstract

An ultralow-heat composite cementing material is prepared from, by weight, 0-30 parts of portland cement clinker, 50-80 parts of phosphorus slag, 0-20 parts of limestone, 0-20 parts of coal ash, 0-2 parts of sulphoaluminate cement clinker, 0-4 parts of calcined alunite and 0-10 parts of gypsum. The material has the advantages of having hydration heat of 58-132 kJ/kg in 3 days, the hydration heat of 98-172 kJ/kg in 7 days, the compressive strength higher than 32.5 MPa in 60 days and the compressive strength higher than 50 MPa in 180 days. Due to the characteristics of low hydration heat and high later-period strength of the material, the material is particularly suitable for hydraulic dam concrete with a long construction period and can greatly reduce temperature rise cracks.

Description

A kind of ultralow hot composite gelled material

Technical field

The present invention relates to a kind of ultralow hot composite gelled material and preparation method thereof, belong to inorganic coagulation material technical field.

Background technology

Along with the continuous increase that China drops into the Infrastructure such as water conservancy, traffic, the application of mass concrete is also more and more extensive, as dam, sluice, pumping plant, the hydraulic structure such as to contain.Concrete for hydraulic structure except the Some features possessing normal concrete, because the difference of applied environment also has other features concurrently.In whole dam structure, form the concrete part of its main body for inner and base concrete, account for about 75% of dam body total amount.In practical engineering application, the ultimate compression strength of design dam body inner concrete and the requirement of anti-permeability performance general not high, mostly be R ₉₀=10-15MPa and S ₂-S ₄.But have strict demand to hydration heat of concrete temperature rise and Crack Control, current cracking phenomena is prevalent in numerous engineering.

The appearance of the concrete crack of water conservancy project can cause the decline of supporting capacity, weather resistance with the weakening of water resistance, even cause dam to shorten work-ing life time serious.The factor that distress in concrete produces mainly contains three kinds: plastic shrinkage, sedimentation contraction and temperature variation.The first factor can be controlled by the concrete proportioning of adjustment, construction and maintenance condition; The second factor can be prevented by the stability of change structure ground; The third factor can adopting the gelling material of low hydration heat, improve the means such as concrete ultimate tensile intensity and evade.

In order to avoid concrete for hydraulic structure is in casting process, occur the phenomenon that heat accumulation, inside concrete temperature rise are too fast causing the formation in temperature rise crack because gelling material participates in hydration reaction, under normal circumstances with middle low heat cement as concrete for hydraulic structure gelling material.Compared to Portland cement, the use of low heat cement brings the risk in crack to a certain degree reducing the temperature rise of dam concrete aquation, meanwhile also need to take much supporting technique means to control concrete internal temperature further and change excessive situation appearance, temperature control difficulty is large, causes construction cost to increase.

The present invention intends adopting the temperature control theory settled at one go, design ultralow hot composite gelled material, being intended to concrete for hydraulic structure uses this gelling material in early stage condensation cure process, release extremely low hydration heat, thus reduce the enforcement of temperature control means, great reduction construction cost, eliminates the generation in temperature rise crack simultaneously.

Summary of the invention

The present invention is directed to the feature that low heat cement hydration heat is relatively too high, and can not the actual situation implemented in many low-heat gelling material patents of invention, the preparation scheme of ultralow hot composite gelled material is proposed.Utilize the characteristic that composite gelled material hydration heat is ultralow, eliminate the risk of concrete for hydraulic structure temperature rise cracking initiation.

Parts by weight of raw materials proportioning of the present invention:

Portland cement clinker 0 ~ 30 phosphorus slag 50 ~ 80 Wingdale 0 ~ 20 flyash 0 ~ 20

Sulfoaluminate clinker 0 ~ 2 exsiccated alum stone 0 ~ 4 gypsum 0 ~ 10.

The specific surface area of each raw material controls in following scope: portland cement clinker 300 ~ 400m ²/ kg, phosphorus slag 300 ~ 450m ²/ kg, Wingdale 500 ~ 700m ²/ kg, flyash 300 ~ 450m ²/ kg, sulfoaluminate clinker 300 ~ 400m ²/ kg, exsiccated alum stone 350 ~ 400m ²/ kg, desulfurated plaster 400 ~ 500m ²/ kg.

The invention has the advantages that: the first, greatly can reduce the usage quantity of grog in composite gelled material, thus indirectly reduce CO ₂quantity discharged; The second, utilize industrial residue on a large scale, reduce the pollution of phosphorus slag accumulation to land resources environment; 3rd, can be used for actual scale operation, technical process is simple, and actual operation is strong; 4th, according to different construction environments, the composite gelled material of optimum hydration heat can be chosen, eliminate the formation in concrete for hydraulic structure temperature rise crack.The hydration heat of different ratio is adjustable controlled, and within 3 days, hydration heat is between 58 ~ 132kJ/kg, and within 7 days, hydration heat is between 98 ~ 172kJ/kg.60d ultimate compression strength higher than 32.5Mpa, 180d ultimate compression strength higher than 50Mpa.

Embodiment

The preparation method that the invention provides ultralow hot composite gum woods material is as follows:

Raw-material proportioning: portland cement clinker 0 ~ 30 phosphorus slag 50 ~ 80 Wingdale 0 ~ 20

Flyash 0 ~ 20 sulfoaluminate clinker 0 ~ 2 exsiccated alum stone 0 ~ 4 gypsum 0 ~ 10.

2, starting material grinding: the first: each component separate grinding is to suitable fineness; The second: each component collocation combined grinding, as Wingdale+flyash, phosphorus slag+Wingdale, phosphorus slag+Wingdale+flyash, grog+flyash+Wingdale etc., controls specific surface area and the fineness of each component by adjustment grinding time.

3, the preparation of composite gelled material: by mixed model machine, each component is mixed according to design proportion.

Embodiment 1:

With φ 2.2*11m cement grinding mill individually grinding common Portland grog, phosphorus slag, Wingdale, flyash, exsiccated alum stone, sulfoaluminate clinker, desulfurated plaster, by controlling the grinding time of cement grinding mill, obtaining common Portland agglomerate ratio surface-area is 354m ²/ kg, phosphorus slag specific surface area is 390m ²/ kg, Wingdale specific surface area is 597m ²/ kg, flyash specific surface area is 412m ²/ kg, exsiccated alum stone specific surface area is 396m ²/ kg; Then mix under mixed model machine according to proportioning in table 1, the properties table 2 of test compound gelling material.

Table 1 composite gelled material proportioning (1)

Sequence number	Common Portland grog/wt%	Phosphorus slag/wt%	Wingdale/wt%	Flyash/wt%	Mix outside exsiccated alum stone/wt%()
						L-1	15	65	16	4	2
L-2	20	60	16	4	2
						L-3	25	55	16	4	2
L-4	30	50	16	4	2

The performance (1) of table 2 composite gelled material

Embodiment 2:

With φ 2.2*11 cement grinding mill individually grinding common Portland grog, phosphorus slag, Wingdale, flyash, exsiccated alum stone, sulfoaluminate clinker, desulfurated plaster, by controlling the grinding time of cement grinding mill, obtaining common Portland agglomerate ratio surface-area is 354m ²/ kg, phosphorus slag specific surface area is 390m ²/ kg, Wingdale specific surface area is 597m ²/ kg, flyash specific surface area is 412m ²/ kg, sulfoaluminate clinker specific surface area is 369m ²/ kg, desulfurated plaster specific surface area is 432m ²/ kg; Then mix under mixed model machine according to proportioning in table 3, the properties table 4 of test compound gelling material.

Table 3 composite gelled material proportioning (2)

Sequence number	Common Portland grog/wt%	Phosphorus slag/wt%	Wingdale/wt%	Flyash/wt%	Mix outside sulfoaluminate clinker/wt%()	Mix outside desulfurated plaster/wt%()
							X-1	15	65	16	4	0.5	2
X-2	20	60	16	4	0.5	2
							X-3	25	55	16	4	0.5	2
X-4	30	50	16	4	0.5	2

The performance (2) of table 4 composite gelled material

Claims

1. a ultralow hot composite gelled material, is characterized in that its parts by weight of raw materials proportioning:

Sulfoaluminate clinker 0 ~ 2 exsiccated alum stone 0 ~ 4 gypsum 0 ~ 10.

2. the ultralow hot composite gelled material of one according to claim 1, is characterized in that the specific surface area of each raw material controls in following scope: portland cement clinker 300 ~ 400m ²/ kg, phosphorus slag 300 ~ 450m ²/ kg, Wingdale 500 ~ 700m ²/ kg, flyash 300 ~ 450m ²/ kg, sulfoaluminate clinker 300 ~ 400m ²/ kg, exsiccated alum stone 350 ~ 400m ²/ kg, desulfurated plaster 400 ~ 500m ²/ kg.