Method and apparatus for preparing concrete mortar
AssigneeDeltracon Deventer B.V.
InventorFrederik C. Blees
Life of this patent
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Abstract
The invention relates to a method and apparatus for preparing concrete mortar. In order to regulate the moisture content of the concrete mortar a sand sample is taken of the sand used. This sand sample is dried. The amount of water added to a concrete charge is regulated subject to the weight difference of the sand sample prior to and after drying.
Claims7
The method of making a batch of concrete mortar from which a useful concrete element may be formed, which comprises the steps of:
- a. providing a supply of sand which has a variable moisture content,
- b. providing a supply of binder,
- c. metering a quantity of the sand to provide a formulated weight of dry sand plus a weight amount of contained water due to the moisture content of the quantity of sand,
- d. drying a sample of the quantity of sand metered in step c and determining the difference in weight of the sample before and after drying,
- e. metering a quantity of binder until the quantity of binder equals a formulated weight of binder,
- f. metering a quantity of water in dependence upon the difference in weight determined in step d until the quantity of water plus the weight amount of contained water of step c equals a formulated weight of water, and
- g. intensively admixing the formulated weights of steps c-e until a batch of the concrete mortar is formed.
The method as defined in claim 27 including the steps of:
- h. repeating steps c-g to form further batches of concrete mortar, and
- i. determining the weight difference as in step d for one batch and adjusting the quantity of metered water as in step f for a subsequent batch in dependence upon such weight difference.
Apparatus for making batches of concrete mortar, successive batches each containing a weight of dry sand, a weight of binder and a weight of water in which the weights are in a formulated weight ratio which when intensively mixed produces a concrete mortar from which useful concrete elements may be formed, which comprises:
- means for providing a supply of sand which has a variable moisture content,
- means for providing a supply of binder,
- means for metering a quantity of the sand until the quantity of sand so metered equals the formulated weight of dry sand plus a weight amount of contained water due to the moisture content of the quantity of sand,
- means for metering a quantity of binder until the quantity of binder equals the formulated weight of binder,
- means for metering a quantity of water until the quantity of water plus the contained water of step c equals the formulated weight of water,
- means for sampling the ratio of sand to water,
- means for determining the quantity of sand and water required to be metered to provide the desired concrete mortar,
- means for adjusting the quantity of sand and water metered to provide the desired concrete mortar,
- means for intensively admixing the formulated weights until a batch of the concrete mortar is formed;
- and
- wherein said means for sampling the ratio of sand to water includes means for drying a portion of the metered quantity of sand and determining the weight difference of such portion before and after drying.
Dependencies are inferred from the claim text.