Factors That Affect the Quality of Concrete

2014-03-17 11:24:39


As the professional manufacturer of concrete mixers and concrete batching plants, we will tell you some factors that affect the quality of concrete.
1. Compressive strength
Concrete compressive strength is proportional to the strength of cement and concrete. According to a formula, when the water-cement ratio equal, concrete produced by high-grade cement more strength than the preparation of a low grade cement. Generally, the water-cement ratio is inversely proportional to the strength of concrete , the same water-cement ratio, by increasing the amount of cement to increase the strength of concrete is false, then only increase the workability of concrete, increases concrete shrinkage and deformation.

2. Coarse aggregate .
When the project started , first determine the coarse aggregate by the technical director of the scene , when the stone strength equal pebble gravel surfaces rougher than it with cement mortar adhesion stronger than pebbles, when water-cement ratio equal to or with the same time, the two materials preparation of concrete , gravel stronger than concrete strength compared pebbles.
Therefore, we generally control the aggregate size of concrete and different parts of the project to adapt; variety of fine aggregate impact is smaller than the coarse aggregate concrete strength, but the quality of the sand also have some impact on the quality of concrete , construction, strict control of sand, clay content less than 3 %, therefore, quality of sand must comply with the quality of concrete requested for gravel of each grade quality standards.
Due to quality changes of sand in the construction site is relatively large , so the on-site construction personnel must ensure that the quality requirements of gravel and sand to adjust the moisture content of water-cement ratio according to the site to ensure that concrete mixing ratio.

3. Species, incorporation of additives , and the incorporation of the way
Concrete strength only in suitable temperature and humidity conditions, then can ensure the normal development, should be required to be conservation construction norms.

4. Temperature
High and low temperatures have a certain influence on concrete strength development. Exposure to anti-summer, take advantage of early and late time high and low temperatures pouring concrete ; minimize transportation and pouring time, to prevent exposure, and increase the slump in the tank when mixing materials ; when watering conservation should not be interrupted, because concrete surface temperature rises during drying, and cooling when watering, which causes the alternation of hot and cold crack resistance of concrete and decrease the strength . In Winter, keep anti- freezing and keep warm, winter construction generally use integrated regenerative method and steam curing method.