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The effect of sand mixed with soil cement has been investigated by laboratory tests as the unconfined compression test, the consolidated-undrained test and the third-point loading test. The soil sample is Bangkok clay and the sand used is Kanjanaburi sand, passing through sieve No. 4 but retained on sieve No. 10. The cement used is a portland cement type 1. For the procedures of specimen preparation, firstly the clay sample was mixed by sand of 0, 20 and 40% by dry weight of clay respectively. Then the aggregate as clay-sand mixer was mixed with cement of 10, 15 and 20% by dry weight. The water content of aggregate was adjusted to higher than the liquid limit of aggregate about 5%. Then the aggregate was mixed by cement and put it into 2 kinds of mould as 1) the cylinder mould with a diameter of 3.5 cm and a high of 7 cm for the unconfined compression test and the CU test and 2) the beam mould with the size of 7.5´7.5´35 cm3 for the third point loading test. The curing day used is 28 days. As results, the higher amount of sand, the higher unconfined compressive strength (qu), angle of internal friction and modulus of rupture. The relationships among the results of 3 types of testing with the quantity of sand mixed were demonstrated.
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