Self-hydration activated pavement base layer

A pavement base and active technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of unsuitable use in soft soil areas, insufficient use of steel slag activity, high density of steel slag, etc., and achieve saving of piles The effect of saving land, good strength deferral, and low price

Inactive Publication Date: 2009-07-22
武汉市公路管理处 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the high density of steel slag, it is not suitable for use in soft soil areas with insufficient foundation bearing capacity.
[0010] 3) Effective play of the weak hydration activity of steel slag: At present, the application research of steel slag in pavement base has not fully utilized the activity of steel slag, and most o

Method used

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  • Self-hydration activated pavement base layer
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  • Self-hydration activated pavement base layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Wuhan steel slag coarse aggregate base: First, Wuhan steel slag and power plant slag are designed as mineral mixture according to reasonable gradation, and then weighed according to the design components (see Table 1 for the weight of each raw material), and compaction test is carried out to determine Optimum water content and maximum dry density, according to the controlled degree of compaction molding test pieces and determine their unconfined compressive strength. The steel slag is natural slag from WISCO, the particle size is less than or equal to 31.5mm, and the particle size of power plant slag and granular slag is less than or equal to 5mm. The amount of slag powder is changed, and the unconfined compressive strength test is carried out according to the degree of compaction of 97%. 6 days, immersion in water for 1 day) The specific results of unconfined compressive strength are shown in Table 1.

[0045] It can be seen from the performance indicators in Table 1 t...

Embodiment 2

[0047] WISCO Steel Slag Fine Aggregate Base: WISCO natural slag is used for steel slag, the particle size is less than or equal to 4.75mm, the dosage is 50%, and the dosage of power plant slag is 35%. The parts by weight are shown in Table 2), and the unconfined compressive forming test was carried out by 97% compaction, and the unconfined compressive strength results in 7 days (6 days for health preservation, 1 day for immersion) are shown in Table 2 and figure 2 shown.

[0048] From Table 2 and figure 2 It can be seen from the figure that: in the case of fixing the content of steel slag and power plant slag, with the decrease of slag powder content, the 7-day unconfined compressive strength shows a regular decreasing trend, that is, for steel slag fine aggregate, by adjusting the granularity The ratio of slag and slag powder can also be used to formulate the components of the self-hydration activated pavement base compound suitable for the pavement sub-base and the base. ...

Embodiment 3

[0050] Egang Steel Slag Coarse Aggregate Base: Egang steel slag and power plant slag are designed as mineral mixtures according to reasonable gradation, and then weighed according to the designed components for testing. In the experiment, the particle size of Egang’s natural slag is less than or equal to 19mm, the dosage is 50%, the dosage of power plant slag is 35%, and the dosage of slag powder is changed (see Table 3 for the weight parts of granular slag and slag powder in the proportion). The unconfined compressive forming test with a solidity of 97% is shown in Table 3.

[0051] From the performance indicators in Table 3, it can be seen that the self-hydrating activated pavement base that meets the performance indicators of the pavement subbase and base can also be prepared by using steel slag from Egang and adjusting the amount of slag powder.

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Abstract

The invention discloses a method which uses steel slag, mineral slag or electric power plant slag as the materials of a self-hydrating activation type pavement basic layer to activate the potential hydrating activation of the mineral slag or the pozzuolana activation of the electric power plant slag by the corresponding interlocking effect of each waste and the self-hydrating activation of the steel slag to form hydrated C-S-H, C-S-A-H, or C-S-A-F-H, ettringite, and calvital hydration product, form the initial strength of the pavement basic layer and ensure the continuous increasing of the later strength; counted by weight portions, the mixture ratio of each material is as follows: 40 to 65 portions of steel slag, as well as 35 to 60 portions of mineral slag and/or electric power plant slag. The pavement basic layer is a non-cement basic layer with excellent performance, and the preparation method thereof is as follows: the materials after being mixed are transported to a constructionfield, paved, rolled, and maintained by moisture retention to a regulated age. The invention uses industrial wastes, can save land and resources and reduce the cost, is beneficial to protecting environment, is simple to be constructed, and is suitable for building the basic layers and the foundation layers of common roads and advanced roads.

Description

technical field [0001] The invention relates to a self-hydration activated pavement base, in particular to a self-hydration activated pavement base of a cementless steel slag-power plant slag-slag system. The so-called self-hydration-activated pavement base refers to the fact that in the entire base system, the raw materials used are industrial solid waste, and no cement is added, and an alkaline environment is formed through the weak hydration of some components of the industrial solid waste itself. , to activate the activity of other industrial solid waste components with potential hydration activity or pozzolanic activity, that is, to activate the activity of the whole system through the hydration products of the system itself, and to form hydration C-S-H, C-S-A-H or C-S-A-F-H, ettringite and calcium hydroxide and other reaction products constitute the strength of the base layer and ensure the continuous growth of the strength in the later stage. Background technique [...

Claims

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Application Information

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IPC IPC(8): C04B18/14C04B18/12C04B18/10
CPCC04B28/082C04B2111/0075Y02W30/91C04B18/08C04B18/141
Inventor 张宗保赵青林张和远周明凯沈卫国
Owner 武汉市公路管理处
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