Resilient Mold Segmentation for Deep Concrete Block Textures
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Solution Overview
Problem
The dry casting process for concrete blocks has limitations in producing blocks with deep decorative patterns due to the risk of the uncured blocks breaking when separating from the mold, restricting the use of forms with projections and notches on the sides, and preventing the creation of blocks with offset surfaces or lips for improved stacking stability.
Innovation Solution
The method involves using a cavity defined by a shaped resilient member for the block face and a rigid form for the block body, allowing for high-pressure compaction and subsequent curing, enabling the creation of blocks with textured faces, offset surfaces, and features like steps or lips for enhanced stacking and stability, using existing dry cast block machines with modifications to the mold design and shoe placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If deep decorative patterns are formed in the mold cavity, then the aesthetic quality and texture depth of the block face is improved, but the uncured block breaks when separating from the mold
Solution Approach 1:
The mold system is divided into two separate components: a rigid form that defines the block body and a removable resilient member that defines the decorative face. This segmentation allows the resilient member to be extracted independently after curing, eliminating the risk of breaking the uncured block while still achieving deep decorative patterns.
Solution Approach 2:
A resilient member made of flexible material (such as rubber or silicone) acts as an intermediary between the rigid form and the concrete mixture. This intermediary can be removed after curing without damaging the block, whereas a rigid mold with deep patterns would cause breaking during separation.
2Shape
If forms with projections and notches are used to create decorative features, then the aesthetic quality is improved, but the form cannot be separated from the uncured block without breaking
Solution Approach 1:
The mold is segmented into a permanent rigid form and a removable resilient member. The resilient member can be taken out after curing, allowing complex decorative features to be formed without preventing form removal.
Solution Approach 2:
The resilient member is made of flexible material that can deform during block removal and then return to its original shape. This flexibility allows the member to be extracted from the cured block even when it has complex projections and notches, solving the problem of form removal.
3Productivity
If the form cavity is used immediately after casting, then productivity is improved, but the block may break if the form is removed too early
Solution Approach 1:
By separating the rigid form from the removable resilient member, the form can be prepared for the next cast while the resilient member cures with the block. This allows immediate form reuse without waiting for complete block curing.
Solution Approach 2:
The resilient member serves as a temporary intermediary that protects the block during early curing. Once the block gains sufficient strength, the resilient member is removed and the form is immediately available for reuse, resolving the conflict between productivity and block strength development.
4Ease of operation
If straight-sided forms are used to ensure easy removal, then ease of operation is improved, but the ability to create decorative projections and notches is lost
Solution Approach 1:
The mold is divided into a simple rigid form for easy removal and a separate removable resilient member for decorative patterning. This segmentation allows both simple geometry and complex decoration to coexist.
Solution Approach 2:
The resilient member made of flexible material can be removed easily even when it has complex decorative features, unlike rigid forms with projections and notches. This flexibility maintains ease of operation while enabling decorative complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the production of concrete blocks with highly textured faces and offset surfaces or lips, facilitating improved stacking stability and allowing for deeper patterns, overcoming the limitations of traditional dry casting by ensuring the blocks can be formed and cured without breaking, and enabling immediate reuse of molds.
Implementation Method 1
The cement mixture is then pressed into the form cavity with sufficient pressure to form a block which has sufficient rigidity
Implementation Method 2
liquid concrete is poured into a block form cavity and remains in the cavity until the concrete has cured sufficiently to permit removal without damage
Data Source
AI summary
A method for dry casting concrete block using a resilient mold having a cavity for forming a block face and a form having a block body forming cavity. The form may be offset from the mold to provide steps where the block face joins the body for aligning stacked blocks. Alternately, the form cavity may have a dimension smaller that the height of the block face and can be offset to form a step between the block face and either the top or bottom of the block. Alternately, an insert may be placed in the form adjacent the mold for forming a downwardly projecting lip along the back of the block. Blocks are formed using a dry cast concrete block machine. After casting, the form is removed from the block. The block remains supported on the mold until after it has cured.