QA & QC

3 PRIMARY STAGES COMPRISING QUALITY CONTROL OF CONCRETE CONSTRUCTION

by
Quality control of concrete construction

Quality Control of Concrete Construction Quality of concrete construction on site can be accomplished in three distinct stages as follow Quality control before concreting Quality control during concreting Quality control after construction Stage-1 (Quality Control Before Concreting) This stage of quality control consists of two steps. Checking of specification requirements regarding excavation, forms, reinforcement and … Read more

12 BASIC QUALITY REQUIREMENTS OF GOOD BUILDING STONES

by
Stone masonry

No single stone can satisfy all the below mentioned quality requirements. For example, strength and durability requirement contradicts ease of dressing requirement. Hence it is necessary that site engineer looks into the properties required for the intended work and selects the stone accordingly. Requirements of Good Building Stones The following are the quality requirements of … Read more

SLUMP TEST OF FRESH CONCRETE TO MEASURE WORKABILITY (IS-1199-1959)

by
Slump test of concrete to measure workability

Slump Cone Test of Fresh Concrete Object This test is performed to measure consistency or workability of fresh concrete, where the nominal maximum size of aggregate does not exceed 38 mm using slump test apparatus. Reference Standards IS : 1199 – 1959 – Method of sampling and analysis of concrete. Equipment & Apparatus Slump cone (Height … Read more

HOW TO MEASURE FIELD DENSITY OF SOIL USING NUCLEAR DENSITY GAUGE?

by
NUCLEAR DENSITY GAUGE

Measurement of Density of Soil in place by Nuclear Density Gauge Purpose This is a quick method of determining the in-situ density of soil which is based on the radiation. Equipment For this test special equipment which measures in place density using gamma radiation is used. Gauge usually contains a small gamma source (about 10 … Read more

HOW TO DETERMINE DRYING SHRINKAGE OF HARDENED CONCRETE?

by
Length Comparator for measuring initial drying shrinkage of concrete specimen

Aim This test method describes the procedure for determining the drying shrinkage or change in length of concrete specimen due to changes in moisture content. Apparatus A length measuring apparatus incorporating a dial gauge capable of measuring the length accurately to 0.005 mm. (see fig shown below) Drying oven capable of maintaining a temperature of … Read more

WHAT IS NON-DESTRUCTIVE TESTING OF CONCRETE & VARIOUS NDT TEST METHODS?

by
NDT test on concrete

Non-Destructive Testing of Concrete (NDT on Concrete) Non destructive test is a method of testing existing concrete structures to assess the strength and durability of concrete structure. In the non destructive method of testing, without loading the specimen to failure (i.e. without destructing the concrete) we can measure strength of concrete. Now days this method … Read more

WHAT CAUSES CRACKS IN CONCRETE AND HOW TO PREVENT IT?

by
causes of cracks in concrete and its remedies

Causes of Cracks in Concrete and its Remedies Cracks in concrete are caused due to following factors. One of the main causes of cracks in concrete is the cooling and contraction due to setting of concrete. Volume change and stresses due to shrinkage are independent of any external load or stress applied. Cracks may develop … Read more

HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE TO BE USED IN CONCRETE?

by
how to decide maximum size of aggregate to be

For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work the use of larger size aggregate will be useful due to the lesser consumption of cement. This will also reduce the heat of hydration and the … Read more