Form-streaking is caused by mortar leaking through form joints and may be aggravated by over vibration from vibrators that are too powerful, or by using forms that vibrate excessively during consolidation.
Placing excessively wet or high-slump concrete mixtures will result in more mortar washing out through tie holes and loose fitting forms. Special care is sometimes required when superplasticizers are used, as they tend to increase leakage at form joints and in pump lines.
Placing excessively wet or high-slump concrete mixtures will result in more mortar washing out through tie holes and loose fitting forms. Special care is sometimes required when superplasticizers are used, as they tend to increase leakage at form joints and in pump lines.
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