<p>Penelitian ini dilakukan untuk mengetahui pengaruh pembelajaran model motivasional terhadap peningkatan hasil belajar ranah afektif siswa.<br />Penelitian ini merupakan jenis penelitian eksperimental yaitu quasi experimental (eksperimental semu). Rancangan penelitian yang digunakan adalah Rancangan Pretest-Posttest Yang Tidak Ekuivalen (The Non Equivalent Pretest-Posttest Design). Sample penelitian ini adalah dua kelas mahasiswa yang mengambil mata kuliah Mekanika Tanah di Program Studi Pendidikan Teknik Bangunan, JPTK, FKIP, UNS. Satu kelas sebagai kelompok eksperimen dan satu kelas sebagai kelompok kontrol.<br />Hasil penelitian menunjukkan ada pengaruh pembelajaran model motivasional terhadap peningkatan hasil belajar ranah afektif siswa.</p>

E-learning is electronic learning and teaching and learning process that is carried out online. This study aims to see the effectiveness of E-Learning through lesson study on Building Materials Science subjects. This research uses a descriptive quantitative method. This study involved 40 students in semester 1 of Class A in Science and Building Materials. Data are obtained by polling and questionnaires by providing answers to questions. Polling data were analyzed using the Rasch model, and the data questionnaire was analyzed using the Linkert scale model. The results showed that the application of e-learning through lesson study could increase the effectiveness of learning process with a value of 84.5%, which is quite useful. The effectiveness of learning process is based on considerations of quality, level of suitability, and time required. Learning materials increase students' readiness to learn to teach before learning in class. Students who are motivated to do assignments and understand eLearning learning materials can complete the learning process according to the specified time.

This paper describes the effect of rice husk ash on the fresh properties, density, and compressive strength of fly ash-based self compacting geopolymer concrete (SCGC). Fresh properties were tested by the slump flow test. Density and compressive strength were tested with cylindrical concrete samples. Diameters of samples were about 150 mm and 300 mm high. The variations of Rice Husk Ash (RHA) as Fly Ash (FA) substitution were 0%, 5%, 10%, and 15%. The alkaline activators used Na2SiO3 and NaOH with ratio at 1.0 and a molarity value of NaOH was fixed at 14 M. The water-binder ratio was fixed at 0.3. The dosage of superplasticizer used 1%. The treatment of concrete used ambient temperature. The test results showed that rice husk ash decreased the slump flow; was not affected on the concrete density; and increased the compressive strength of SCGC. The maximum percentage of rice husk ash substitution to achieve the EFNARC slump flow standard was 7.16%. The density of the SCGC was 2076.4 kg / m3 – 2104.3 kg / m3, and classified to the normal concrete. The maximum compressive strength of SCGC was 11.476 MPa at the percentage of rice husk ash substitution about 8.65%.

<span class="fontstyle0">Tujuan penelitian ini adalah, untuk mengetahui (1) pengaruh variasi serbuk<br />keramik sebagai pengganti agregat halus dan pengaruh abu terbang (</span><span class="fontstyle2">fly </span><span class="fontstyle0">ash)<br />sebagai pengganti 15% dari berat semen terhadap kuat tarik belah beton, (2)<br />pengaruh variasi serbuk keramik sebagai pengganti agregat halus dan pengaruh<br />abu terbang (</span><span class="fontstyle2">fly </span><span class="fontstyle0">ash) sebagai pengganti 15% dari berat semen terhadap porositas<br />beton. (3) persentase penggunaan serbuk keramik sebagai pengganti agregat halus<br />yang optimum untuk menghasilkan kuat tarik belah maksimum pada beton. (4)<br />persentase penggunaan serbuk keramik sebagai pengganti agregat halus yang<br />optimum untuk menghasilkan porositas minimum pada beton. Penelitian ini<br />menggunakan metode kuantitatif eksperimen. Analisa data menggunakan uji<br />regresi, dengan melakukan uji prasyarat normalitas, homogenitas, dan linearitas<br />dengan bantuan program SPPS 16.0. Variabel yang terdapat pada penelitian ini<br />adalah (1) Variabel terikat : kuat tarik belah dan porositas beton , (2) Variabel<br />bebas : variasi serbuk keramik sebagai pengganti agregat halus pada beton.<br />Keseluruhan anggota populasi yang menjadi sampel penelitian ini adalah 40<br />sampel. Benda uji berupa silinder berdiameter</span><span class="fontstyle0">t</span><span class="fontstyle0">150 mm dengan tinggi 300 mm,<br />dan silinder dengan diameter 50,8 mm</span><span class="fontstyle0">t</span><span class="fontstyle0">dan tinggi 50 mm. Berdasarkan hasil<br />penelitian dapat disimpulkan bahwa, (1) adanya variasi serbuk keramik sebagai<br />pengganti agregat halus dan 15% </span><span class="fontstyle2">fly ash </span><span class="fontstyle0">sebagai pengganti semen, berpengaruh<br />signifikan sebesar 74,1% terhadap kuat tarik belah beton. (2) Adanya variasi<br />serbuk keramik sebagai pengganti agregat halus dan 15% </span><span class="fontstyle2">fly ash </span><span class="fontstyle0">sebagai<br />pengganti semen, berpengaruh signifikan sebesar 51,5% terhadap porositas beton.<br />(3) Kuat</span><span class="fontstyle0">t</span><span class="fontstyle0">tarik</span><span class="fontstyle0">t</span><span class="fontstyle0">belah maksimal sebesar 2,75 Mpa pada variasi serbuk keramik<br />optimum sebesar 6,214%. (4) Porositas</span><span class="fontstyle0">t</span><span class="fontstyle0">minimum sebesar 12,33% pada variasi<br />serbuk keramik optimum sebesar 15%.</span> <br /><br />

<p><em>The research aims to determine ( 1) the increase of compressive strength of concrete with addition of fly ash to be compared to normal concrete ( 2) the resistant of normal concrete and also concrete with fly ash mineral additive in 2%, 5% and 7% sulphuric acid solutions, and ( 3) the resitant of concrete with fly ash mineral additive with the increase of concentration of sulphuric acid solution in comparing normal concrete.</em></p><p><em>The method employed in this research was experimental method, by preparing the test object constituting the concrete cylinder with </em><em>Æ</em><em> 150 mm and 300 mm height for the compressive strength test. With the percentage of fly ash addition are 0%, 20%, 30% and 40% from requirement cement and qualities of designed concrete is 22,5 MPa. Amount of object test to the each condition is 4. To know concrete resistant in sulphate aggression environment, hence conducted by immersied of concrete in sulphuric acid solutions with concentration 2%, 5% and 7% during 30 days.</em></p><p><em>From the research, it can be found that: ( 1) the addition of fly ash into fresh concrete will improve compressive strength of concrete. At addition fly ash 20% from requirement cement, compressive strength of  concrete increase 23,39%. For the addition of fly ash 30% and 40%, the increase of compressive strength concrete were 21,54 % and 0,31%. While in optimum percentage of fly ash addition is 23,46% (2) the immersied concrete in sulphuric acid solution result degradation compressive strength of concrete. At the same concentration of sulphuric acid solution, concrete with fly ash additive mineral have resistant which is better to be compared to normal concrete. This seen [at] percentage of compressive strength degradation of fly ash concrete which is smaller to be compared to normal concrete. Equally the percentage of compressive strength degradation inversely proportional with the percentage of fly ash addition ( 3) the increase of concentration of sulphuric acid solution will be result of aggression that happened at ever greater. If compared to normal concrete, concrete with fly ash in the reality more effective if used at high concentration of sulphuric acid solution. This matter can be seen from difference of percentage of compressive strength degradation ever greater at the height of concentration of sulphuric acid solution.</em></p>