The Development of Lightweight Concrete Block using Lightweight Expanded Clay Aggregate from Soft Bangkok Clay for Green Building

Abstract

This paper aims to investigate the flexural and compressive strength of cement Stabilized Rammed Earth (CSRE) wall with steel reinforcement varied slenderness wall. Lateritic was used for the study by being mixed with Portland cement, type 1 at the ratio of cement: lateritic soil, 1 : 7 by weight of dried lateritic soil. Standard compaction test was carried out either with or without cement in order to find Optimum Moisture Content (OMC) and Maximum Dry Density (MDD). Test specimens were the OMC to mix lateritic soil with and without cement with dimension of 400 x 400 x 200 mm compacted 95% of MDD. Compressive strength of CSRE Prisms was tested by cut specimens 400 x 400 x 200 mm. The flexural and compressive strength test was conducted by rammed earth mixed cement wall at 125 mm thick and 1000 mm wide, slenderness ratio (h/t) at 8, 10 and 12, respectively. Soil compaction was controlled for not less than 95% of MDD of standard compaction in both cases. The test results showed standard compaction test for soil-cement rendered was OMC at 10.92 % and MDD at 1.926 g/cm3 and for soil-cement rendered mixing cement was OMC at 9.16 % and MDD at 1.984 g/cm3. The compressive strength of CSRE Prisms results of soil-cement rendered with and without cement were 48.35 and 12.74 kg/cm2 respectively. The compressive strength of soil-cement rendered wall were 11,512.80, 40,599.49, 39,301.14 and 35,406.09 kg decreasing for wall with increasing h/t of 6, 8, 10 and 14 respectively excepting h/t of 6 was minimum compressive strength. The flexural strength of soil-cement rendered wall was 774.9, 738.0, 747.23 and 516.6 kg-m and modulus of rupture 29.76, 28.34, 28.69 แล ะ 19.84 kg/cm2 for h/t of 6, 8, 10 and 14 respectively.