QUALITY CONTROL METHOD OF EARTH MIXTURE COMPACTION Russian patent published in 2009 - IPC E02D1/02 

FIELD: construction industry.

SUBSTANCE: invention can be used for controlling the quality of compaction of macrofragmental earth mixtures with small fractions when erecting water seals, for example, cores, screens, fore aprons, quality hydrotechnical, automobile and railroad earth fills, as well as for bases. Quality control method of earth mixture compaction involves sampling of earth mixture, determining of volume and mass of sample, density of coarse particles and content of small particles of sample, performing quality control of compaction in terms of density of small-particle earth, and determining density of earth mixture. At check points of compacted layer of earth mixture there shall be manually dug mini-pits V_p=0.5-1.0 l. Volume of mini-pit is measured by filling the pit with calibration homogeneous dry coarse sand or by filling it with water, but first, bottom and walls of mini-pit shall be isolated with thin waterproof film. At that in the area where there were mini-pits there sampled is 100-150 g of earth mixture, and then those samples are sieved in order to separate fine earth, and its humidity W_f.e. is determined. Earth mixture sample taken from mini-pit is weighed, mass of sample m_p is determined and density ρ_p of earth mixture is calculated by dividing mass m_p of earth mixture taken from mini-pit by the volume of mini-pit V_p. Weighed earth mixture is dried to the constant value and weighed, and humidity W_p and density of dry earth of earth mixture ρ_dp in mini-pit is determined. Dried mixture is washed on the sieve, and sieve residue is dried to the constant value; density of coarse earth particles p_sc.e. and mass of coarse earth m_c.e. is determined, and as per difference of masses of mixture m_p and coarse earth m_c.e. there calculated is mass of fine earth m_f.e. in mini-pit. According to the obtained values there determined is content of fine earth in mini-pit by dividing mass m_f.e. of dry fine earth in mini-pit by mass m_p of dried mixture taken from mini-pit; as per the obtained results there determined is density of dry fine earth according to the above relations. In addition from several mini-pits, for example from 5 of them there sampled is one big sample of 500 to 1500 kg; without measuring the volume of sample for determining fine earth content P_f.e. of earth mixture of full particle-size distribution, as per the obtained data there determined is density of dry earth of earth mixture of full particle-size distribution according to the above relations.

EFFECT: improving measuring accuracy and efficiency, and reducing labour intensity.